Data Engineer (DataOps) at Toss Securities | Seoul

Join Our Team!The Data Engineer (DataOps) at Toss Securities is part of the Data Infra Team within the Data Division.The Data Infra Team manages a big data infrastructure based on the Hadoop ecosystem and operates a log/search platform (Elasticsearch). We provide technical support for Kubernetes, which is widely used for data acquisition and various data ope…

We are excited to share details about the position you will be joining. As a Platform Product Owner at Toss, you will play a crucial role in designing and building the foundational infrastructure that supports our services. You will create a platform that all teams can rely on, focusing on areas like authentication, finance, risk management, and internal tools that are invisible to users. As a member of the product organization, you're responsible for designing the basis that enhances efficiency and speed across the entire organization, beyond just specific services. Here are the responsibilities you will take on: Establish and achieve bi-annual goals for your product to ensure its success. Define problems based on customer needs and business impact, structuring them into actionable tasks. Clarify complex issues and collaborate with various stakeholders to derive long-term solutions. Continuously improve and evolve common systems and platforms to ensure they are effectively utilized. We are looking for someone who: Has experience in defining problems from the customer perspective and proactively executing appropriate solutions. Has experience structuring and solving complex problems based on data. Possesses a strong sense of responsibility and execution, even in challenging situations. Has led large-scale and complex projects through collaboration with diverse stakeholders. Is familiar with common infrastructure or B2B/back-office domains, particularly in areas like authentication, risk, and finance systems, internal tools. Joining us opens up opportunities in various teams: By applying through this job posting, we will consider you for the most suitable team and role based on your experience, strengths, and interests. Platform DivisionWe solve compliance and financial issues through our products, enabling Toss members to address complex problems safely and quickly. (Key services: Financial/Accounting systems, Compliance, Internal Solutions, Toss Home Screen) Foundation DivisionWe design and operate Toss's core systems based on technical expertise, building stable and scalable infrastructure that accelerates innovation across teams. (Key services: Authentication/Member common modules, FDS/AML, Transfer/Settlement systems, B2B member systems) Pay DomainWe are developing Toss Pay, an easy payment service, creating a reliable payment platform and innovative payment methods, and various services aimed at growing Toss Pay users. Commerce DomainWe are developing Toss Shopping, a B2C e-commerce service in an open market format, providing differentiated shopping experiences and driving changes in everyday life beyond finance.

Who We AreAt Twelve Labs, we are on a mission to redefine the global standards for video understanding AI! We are creating world-class AI models tailored for video data, providing specialized search, analysis, summarization, and insight generation capabilities.Our models are utilized by the largest sports leagues worldwide to swiftly and accurately highlight key moments in vast game footage, delivering an ultra-personalized viewing experience. In South Korea, our technology assists integrated command centers in efficiently navigating CCTV footage to respond to crises, while major global broadcasters and studios leverage our models for content creation aimed at billions of viewers.As a Deep Tech startup with offices in San Francisco and Seoul, Twelve Labs has been recognized as one of the world's top 100 AI startups by CB Insights for four consecutive years. We have secured over $110 million in investments from leading VCs and companies including NVIDIA, NEA, Index Ventures, Databricks, and Snowflake. Our AI model, uniquely developed in Korea, is exclusively offered through Amazon Bedrock. We thrive on building innovative products alongside exceptional colleagues and growing with clients worldwide.Our core values are foundational to our work:Honesty and reflection about ourselves and our teamsPerseverance and humility in the face of failure and feedbackA commitment to continuously elevate team capabilities through ongoing learningIf you enjoy tackling challenging problems and growing through the process, the opportunity awaits you at Twelve Labs!About the TeamThe ML Data Team at Twelve Labs believes that 'data determines the performance of AI models.' We construct high-quality data end-to-end necessary for training and evaluating multimodal AI models. Our team is responsible for collecting, filtering, processing, and labeling diverse multimodal data such as video, image, and audio. We collaborate with various teams to design training data that can unleash new model capabilities, while also developing evaluation datasets that reflect real user experiences. To perform all these processes efficiently, we develop and continuously improve internal tools.Through a meticulously designed data pipeline, the ML Data Team plays a crucial role in developing Twelve Labs' world-class video understanding models.About the RoleAs the Engineering Manager for the ML Data Team, you will be a pivotal leader in building and guiding a high-performing team, while also developing the large-scale data infrastructure necessary for AI model training. This position encompasses team operations, technical architecture design, engineering recruitment and mentoring, and enhancing project execution, all aimed at fostering a high-quality data ecosystem that supports Twelve Labs' products and research.In this Role, You WillTeam Building and Technical Culture Development Lead the ML data engineering team by defining and executing the team's mission and technical strategy. Establish and execute recruitment plans to attract top talent, while fostering a high-level engineering culture through code reviews and technical mentoring.Design and Operate Multimodal ML Data Engine Design and operate pipelines for collecting, refining, and labeling petabyte-scale video, image, and audio data for AI model training. Additionally, build an automated dataset generation system for VLM/LLM training and a high-precision preprocessing engine.Design and Operate Multimodal ML Data Infrastructure Create and manage scalable data infrastructure capable of reliably processing large-scale data.Establish and Execute Data Strategy Collaborate closely with PM, research, infrastructure, product, and other organizations to establish and prioritize a data strategy aligned with the company's vision.

Join Our Team The Platform Product Owner at Toss Place is responsible for designing and enhancing the core platform and shared infrastructure that supports the innovation of offline payment solutions. You will create the foundational services that support everything from store orders, rewards, and payment services to settlement and customer support administration, structuring common issues to enable faster movement across teams while working towards long-term solutions. Your role will involve designing structures for product scalability and reliable platform foundations, leading continuous improvements. You will define problems and derive tasks to guide direction and execute enhancements. The PO chapter at Toss Place is made up of members with 2 to 15 years of experience. Through our weekly chapter meetings, you will share and resolve challenges arising from product operations and improvements together with your chapter colleagues. Depending on your experience and skills, you will be placed in areas where you can excel post-interview, such as customer-facing services, new platform planning, or internal tool projects. What You'll Do Lead the improvement of the foundational platform to ensure stable and scalable operations for rapidly growing store operations and order/payment-related services within Toss Place. Diagnose problems across various domains including store services, automation tools, internal admin, and operational policies, and redesign them for efficiency. Establish execution strategies to maximize business impact by refining core systems. Eliminate unnecessary procedures decisively, enhance platform improvements, and automate processes to reduce repetitive operations and optimize working methods. Who We're Looking For We need someone with experience designing foundations that fundamentally improve service speed, stability, and operational efficiency. Ideally, you have experience developing platform products from purpose setting to fostering voluntary use, rather than just implementation. Looking for someone who has collaborated with diverse stakeholders across planning, design, development, operations, and customer experience, clearly defining complex problems and organizing them into long-term roadmaps for execution. If you have experience dealing with complex domains such as back-office systems, internal admin, financial settlement/customer management systems, or B2B SaaS, that would be a plus. End-to-end experience from problem definition to strategy formulation, collaboration, execution, and performance verification would be highly valued. Resume Tips Please detail your contributions to product/service improvement planning in the projects you've handled. It’s beneficial to present a flow from problem definition to strategy resolution and execution rather than just listing projects. Include quantifiable achievements and what they meant for the organization or users. Examples of working autonomously, collaborating with complex stakeholders, and finding and structuring the essence of problems would also be advantageous. Your Journey to Joining Toss Place Application submission > Phone interview > Job interview > Cultural fit interview > Final acceptance

Join Our Team! At Toss, we are pioneering the offline payment industry and are passionately driving change within the payment ecosystem. The Platform Server Developer will be a key member of the platform team, focusing on developing server platforms that support all services, monitoring issues as part of SRE, enhancing deployment pipelines as DevOps, and collaborating closely with developers across different silos. You will work within a dedicated server platform team that ensures rapid recovery from service disruptions and maintains stable operations. Your Responsibilities: Develop common functionalities (such as Metric, Logging, Distributed Lock, Messaging) required by Server Developers at Toss using Java/Kotlin and Spring Framework. Create and manage platform services relevant to common interests (API Gateway, Monitoring & Alert System) used in Toss. Monitor server infrastructure at Toss, quickly detect issues, and work towards rapid recovery. Continuously improve the architecture from a holistic system perspective. We Are Looking For: Individuals with experience in providing server functionalities. Familiarity with technologies like Redis, Kafka, and ELK stack is a plus. Experience in designing and operating high-availability scalable systems. Experience in handling systems that manage large-scale real-time traffic. Proficiency in monitoring, troubleshooting, and performance tuning across various layers such as Spring Framework, JVM, OS, and Network. People who embrace change and want to continuously enhance services and infrastructure using appropriate technologies. Resume Recommendations: Please detail your experience related to platform-related tasks (common services, common library implementation and operation) and the reasons behind them. If you have designed and operated high-availability scalable systems, please explain your rationale and relevant experiences. For those with experience in designing and operating systems that manage large-scale real-time traffic, please include specific troubleshooting or performance improvement processes you encountered while operating services. Technologies Used at Toss: Kotlin, Java, Gradle Netty, Spring MVC, Spring Webflux, Spring Boot, Spring Cloud Gateway, and more.

Join Our Team! As a Server Developer (Platform) at Toss Bank, you will be an integral part of our Platform Team, ensuring the seamless operation of our banking services. We are dedicated to rapid recovery from unexpected service disruptions, preparing thoroughly to maintain stable and reliable operations. Our team consists of talented professionals from promising IT companies, all committed to ensuring the stability of our banking systems. We aim to enhance user experience by enabling our users to enjoy safe, fast, and reliable banking services through automated analysis and runtime enhancements. Your Responsibilities: You will develop and operate platform services used by Toss Bank (including high-volume message delivery, API gateways, APM, monitoring & alert systems, ELK, HAProxy, etc.). Provide common functionalities (Metric, Logging, Message Queue, Distributed Lock, Memory Cache, etc.) as platform libraries for our services. Implement redundancy measures to ensure stable service operations. Respond to various failures, analyze incidents, and work to prevent future occurrences. Collaborate with the infrastructure team during large data center operations to ensure service continuity. Who We’re Looking For: Experience in designing and operating highly available, scalable systems is essential. Experience in developing systems that handle large-scale real-time traffic is required. Proficiency in development using the Spring Framework is necessary. A history of continuous efforts in performance optimization and operational automation. Quick thinking and problem-solving skills are a must. A willingness to embrace change and adapt quickly to new technologies for ongoing growth. Ability to foster growth among fellow developers through collaboration. Enjoyment of mission-critical service environments with a strong sense of responsibility. Please include the following in your resume: A minimum of one specific project you participated in, detailing your contributions and the process of overcoming challenging tasks. Share various problems encountered while operating systems and detail your personal attempts and results in resolving those issues. If you have similar experiences in developing systems that handle large-scale real-time traffic, please provide detailed examples. Share your growth aspirations as a developer and the efforts you are making toward that growth.

About the Team You'll Join You will be part of the DataOps Engineering Team under the Data Division at Toss Bank. Utilize the Hadoop Ecosystem and various open-source technologies to manage enterprise data reliably and efficiently. Establish standards for data workflows and develop and optimize data pipelines. Responsible for performance and stability optimization of open-source-based analytical platforms. Your Responsibilities Upon Joining Develop, operate, and automate the enterprise data pipelines. Efficiently process and optimize large data using open-source tools. Manage a large-scale Airflow cluster in an on-premises Kubernetes environment. Evaluate and implement new technologies like Iceberg and Trino for data platform enhancement. Ideal Candidate Profile Proficient in development within a Hadoop Ecosystem environment. Extensive experience with open-source pipeline tools such as Airflow, Nifi, Kafka, and Flink, along with strong problem-solving skills. Experience in developing data pipelines for large-scale data collection, processing, and analysis. Experience in analyzing, tuning, and optimizing execution plans for distributed processing engines like Spark is a plus. Beyond just using open-source tools, it would be great if you have experience in analyzing source code and contributing through patches and backporting. Resume Recommendations Please specify impactful projects you have worked on, particularly those involving the design and construction of ETL/streaming pipelines. If you have applied improvements in actual services, please quantify the results (omit sensitive information if necessary). Share experiences that go beyond mere development and construction to include troubleshooting, operations, and achieved results. Joining Toss Bank Application Submission > Job Interview > Cultural Fit Interview > Reference Check > Compensation Negotiation > Final Acceptance and Onboarding Important Notices If any false information is found in your resume or if disciplinary issues are confirmed during your employment history, hiring may be canceled. Hiring may be canceled for applicants who fall under the disqualifications specified in Toss Bank's employment regulations.

CLO Virtual Fashion is at the forefront of digital fashion, offering a comprehensive suite of services that span from concept to design, manufacturing, marketing, fitting, and styling through advanced 3D garment simulation algorithms.Founded in 2009, CLO Virtual Fashion is pioneering a new ecosystem in digital fashion. Utilizing innovative design software such as CLO, Marvelous Designer, and Jinny, along with specialized platforms like CLO-SET and CLO-SET CONNECT, we are committed to fostering an efficient and sustainable workflow throughout the entire garment lifecycle. Our solutions enable seamless functionality between physical and digital garments within the CLO system.As a leader in the global digital fashion market, CLO Virtual Fashion operates 16 offices across 13 countries, including Asia, North America, Europe, and South America, continually expanding our reach by serving numerous clients worldwide.

Join the Toss Securities Frontend Chapter!At Toss Securities, we are dedicated to creating innovative mobile products that seamlessly integrate native Android and iOS applications with web views using modern web technologies. Our mission is to simplify complex investment products, ensuring that everyone can enjoy a user-friendly and sleek investment experience.We leverage cutting-edge engineering techniques to showcase real-time data without interruptions, optimizing performance for our users.Your Responsibilities:- Optimize performance across various domains including browser, CDN, and network to provide the best user experience for over 2.5 million daily active users and 90,000 concurrent users.- Provide guidance and modules to product developers for easy performance optimization.- Actively manage a redundant deployment infrastructure utilizing cloud services such as AWS and Cloudflare.- Develop monitoring and error response tools tailored for real-time traffic.- Build a self-service MFA development framework that allows independent development across teams.- Provide a client log SDK operated by Toss Securities.- Create a development environment that facilitates a smooth transition between native and web view screens, free from compatibility issues.What We've Achieved:- Our mobile products at Toss Securities operate as a unified service, employing a Micro Frontend Architecture (MFA) to reduce complexity in product development.- Implemented a SharedWorker-based module to optimize WebSocket communication for our PC platform.- Established a deployment pipeline that supports rapid and reliable FE platform releases multiple times a day.What We're Looking For:- A deep understanding of frontend development and deployment environments.- Proven experience in identifying and improving issues within these environments.- Experience in accurately analyzing and resolving root causes beyond merely solving problems.- A background in automating frequent tasks to a high degree.- A keen interest in testing within frontend environments.Resume Tips:- Highlight the impact and learning points from your experiences, rather than just listing them.- Share your understanding of web browser mechanics and any experiences that improved web service performance.- Provide details on your understanding of transpiling and bundling, especially in supporting a wide range of browsers efficiently.- Mention any experience managing multiple packages within a single monorepo.- Discuss your proactive approach to researching and adopting new technologies.Technologies We Use:- Core: React, TypeScript- Package Managers: PNPM, Yarn- Build Tools: ESBuild, Vite, Webpack, SWC, Babel- Infrastructure: AWS, CloudFlare, Terraform- Monitoring: Sentry, Grafana- CI/CD: GitHub Actions, GoCDYour Journey with Toss Securities:- Application submission > Pre-assessment task > Technical interview > Cultural fit interview > Reference check > Offer negotiation > Final acceptance and onboarding.Please Note:- Any false information in your resume or disciplinary issues during your employment history may result in cancellation of recruitment.- Candidates subject to hiring restrictions according to Toss Securities regulations may also be disqualified.- Individuals with disabilities and veterans will be given preferential consideration in accordance with relevant laws.- The job title upon joining will be 'Frontend Developer'.A Message to Future Colleagues:"We support our best colleagues to achieve exceptional performance."

Join Our Team!As a Data Engineer specializing in Kafka & Streaming, you will be part of the Real-Time Data team within Toss Bank's Data Division.This team manages a variety of real-time data platforms, including Kafka, Flink, CDC, Kafka Connect, and ClickHouse.Your mission will be to ensure the reliability and scalability of the enterprise data infrastructure, enabling safe and efficient data collection and processing.Your ResponsibilitiesManage a Kafka Broker Cluster for high-volume message processing, including server MSA, service events, and client logs.Identify and resolve root causes of communication issues between Kafka Clients and Brokers in a Spring Boot environment.Develop real-time data applications to maintain stable Active-Active redundancy of Kafka Brokers.We Are Looking ForA candidate with a strong background in JVM-based programming languages and a deep understanding of them.Solid knowledge of operating systems, networks, data structures, and algorithms is essential.Experience utilizing Kafka Clients in a Spring Boot environment is highly desirable.Experience operating Kafka Brokers is a plus; however, understanding distributed systems is also acceptable.Resume RecommendationsPlease detail impactful projects you've worked on, especially those involving Spring Boot and Kafka.Express your deep understanding of distributed systems and storage solutions.Focus on the learning journey you undertook while creating your deliverables rather than just the final results.Your Journey with Toss BankApplication > Technical Interview > Cultural Fit Interview > Reference Check > Offer Negotiation > Final Acceptance and Onboarding.Important NoteAny falsehoods in your application materials or disciplinary history during your employment may result in the cancellation of your application.

Join Our Dynamic Team The legal department at Toss is structured into specialized areas: Fintech, Platform, Global, and Corporate, unified under what we call the Legal Tribe. The Platform Legal Team focuses on non-financial platforms such as e-commerce, advertising, and app-in-app platforms, addressing regulatory issues directly linked to business structures like e-commerce, advertising, and fair trade. We operate as partners from the initial conceptual stages of our business, ensuring that legal considerations guide the design of our structures within regulatory frameworks. In a rapidly evolving platform environment, our core mission is to create standards and frameworks that facilitate sound decision-making rather than serving as a brake on business operations. Your Responsibilities Review transaction structures for key services in e-commerce and advertising, define legal risks, and propose solutions. Analyze critical regulatory issues proactively and design viable alternatives that align with business situations. Support businesses in making rational choices by structuring explanations of legal issues based on risk levels, uncertainties, and alternative scenarios. Collaborate with business leaders, product owners, and compliance teams to clarify complex issues and contribute to swift decision-making. Draft and refine contracts, internal policies, and guidelines, establishing standards applicable across the platform. Beyond simple reactive measures during disputes, improve structures and processes from a root cause analysis and recurrence prevention perspective. Continuously monitor the evolving landscape of platform and data privacy regulations, analyzing and sharing their impacts on the business. Who We Are Looking For [Essential Qualifications] Possess a valid Korean bar license and have over 5 years of experience in a law firm or in-house legal setting. Have practical experience dealing with major legal issues in non-financial business sectors such as e-commerce, advertising, and platform operations, including fair trade. Demonstrate the ability to present structured explanations of legal bases, risk levels, alternatives, and conditions rather than just stating legal positions. Have experience collaborating with diverse stakeholders to clarify issues and drive actionable conclusions. [Preferred Qualifications] Experience in legal roles within e-commerce or comprehensive platform companies. Understanding of platform transaction structures such as marketplace, intermediary, and advertising products. Experience in responding to data and privacy-related regulations. Experience in designing or enhancing internal policies, processes, and guidelines. Application Recommendations Clearly outline how you have defined and structured platform and fair trade-related issues and the alternatives you designed. Highlight contributions that impacted actual decision-making, policies, or structural changes rather than just advisory roles. Feel free to anonymize sensitive information if necessary. The Journey to Joining Toss Application submission > Job interview > Cultural fit interview > Reference check > Salary negotiation > Final acceptance and onboarding.

About the Team You'll JoinThe Server Developer for Toss Bank's Savings Platform is a key member of the Savings Platform Team, collaborating closely with various squads (such as Savings, Groups, Forex, and Remittances) to deliver exceptional financial products.Our Savings Platform is transitioning to a microservices architecture (MSA), focusing on core functionalities like account creation, remittances, account closures, interest calculations, and currency exchanges.Previously constructed under a monolithic structure based on MDD, we are currently reforming our systems using Kotlin and Spring, with successful implementations like 'Instant Interest' and 'Lifetime Free Currency Exchange' already operational on the MSA.Your Future ResponsibilitiesYou will manage the design, development, and operation of our core deposit system, which handles everything from account openings to remittances, interest calculations, and closures.Redesigning the savings platform into an MSA architecture will enable us to overcome previous limitations and facilitate the rapid introduction of new products and features.In addition to savings, you will collaborate across domains including Forex, cards, and external integrations, ensuring a seamless customer experience while maintaining data consistency, transaction stability, and an automated testing environment.Who We're Looking ForWe are excited to meet individuals eager to step outside their comfort zones and challenge the norms by creating a completely new banking experience.If you have a passion for solving fundamental issues such as data flow, consistency across complex domains, and transaction design, you will thrive in this role.Experience in domain-centric data modeling, designing testable structures, and quality management from an operational perspective is highly valued.Beyond mere implementation, having a background in understanding and improving problem structures, along with experience in accountable communication with related departments, will be significant assets.Experience in designing and operating services using RDB systems such as Oracle or MySQL is also welcome.Resume RequirementsPlease include at least one concrete example of a project you participated in, showcasing your contributions and the challenges you overcame.As part of service development, problem-solving skills are crucial. Clearly detail a problem you faced, the attempts you made to solve it, and the results achieved.If you have automated repetitive issues or solved problems in innovative ways, please include those examples.Share experiences where you addressed complex domain issues or enhanced operational stability within technical constraints (legacy systems, shared components, etc.).Additionally, if you have made genuine improvements within restricted environments due to organizational culture or external regulations, please outline those experiences.Joining Toss BankApplication Submission > Interview Process > Offer

Join our dynamic team at Daangn as a Frontend Software Engineer dedicated to building engaging community platforms. You will be responsible for developing user-friendly web applications that enhance user experiences and foster community interaction. Collaborate with cross-functional teams to design and implement innovative solutions that meet the needs of our users.

Join us in transforming the way customers experience shopping within the financial services ecosystem.Toss Commerce is dedicated to creating an effortless shopping experience that allows customers to discover and enjoy products with ease.We leverage machine learning for personalized recommendations and advertising, providing both convenience for customers and growth opportunities for sellers through enhanced sales performance and operational efficiency.We aim to connect high-quality products with customers naturally, fostering a growth-oriented environment for customers, sellers, and the platform alike.About the Position:As a Platform Product Owner, you will establish semi-annual goals for your domain and lead efforts to achieve them.You will have the autonomy to make key decisions regarding business direction, revenue, and monetization, setting objectives and strategies through comprehensive discussions with teams and stakeholders.Your role involves designing and managing common systems such as catalogs, pricing, promotions, orders, settlements, and seller tools, ensuring a stable platform for sellers and users to grow rapidly.You will build a foundation that supports the rapid growth of various services while maintaining platform reliability and scalability.Key Responsibilities:Design and operate core platform systems including catalogs, pricing, promotions, and order/settlement processes.Facilitate stable expansion across multiple product teams through common components and data standardization.Ensure scalability and data reliability, minimizing unnecessary costs and operational risks.Lead internal stakeholders in effectively implementing and utilizing the platform.Ideal Candidate:You have experience designing and operating platform products within complex domains.You excel at change management and stakeholder alignment, capable of designing scalable structures while ensuring data reliability and operational quality.You are passionate about creating the foundation for sellers and internal teams to grow together.Additional Information:We are open to considering applicants for roles beyond the Platform Product Owner position.We will review your experiences and strengths to recommend the most suitable position for you.If you have specific areas of interest, you can also apply through individual postings listed above.Feel free to apply through this listing as it covers all positions without duplication.Resume Tips:Clearly outline your experiences using frameworks such as problem definition → hypothesis development → execution and validation → results, or problem definition → solution derivation → collaboration with stakeholders → final outcomes.It is beneficial to include your insights and the impact of your contributions rather than simply listing responsibilities.

About the Team You'll Join The Server Developer (Market Platform) will be part of the Market Team, dedicated to developing the ‘Toss Securities Market Platform’. The Market Team handles various essential tasks for securities services, including the provision of domestic and international stock prices. The team's objective is to deliver an optimized, ultra-efficient system. Our engineers are responsible for market data, actively collaborating to determine necessary features and shaping the development direction. Your Responsibilities Develop a broad range of applications from customer-facing APIs/WebSockets to external organization communications. Gain experience with real-time high-volume traffic and low-latency event processing, often tackling complex challenges. Contribute to architectural improvements, focusing on deployability, operational ease, stability, and performance enhancement. Who We Want to Work With We are looking for individuals who excel at solving complex problems. Those who embrace change, adopt new technologies, and demonstrate a strong sense of responsibility will thrive here. Proficiency in Go, Kotlin, and Spring Framework is a plus. Experience in developing mission-critical systems is highly desirable. Background in real-time data processing and network programming would be beneficial. Resume Recommendations Highlight impactful projects and contributions. Detail the problems you have solved, the thought process behind your solutions, and the outcomes achieved. Technologies Used at Toss Securities Go, Kotlin/Spring Boot, Netty Redis, MySQL, Kafka, NATS The Journey to Joining Toss Securities Application submission > Live coding interview > Technical interview > Cultural fit interview > Reference check > Offer negotiation > Final acceptance and onboarding Additional Information Any falsified information in your resume or documented disciplinary actions during your employment history may lead to cancellation of the hiring process. Individuals identified as ineligible for hire under Toss Securities regulations may have their application revoked. We prioritize candidates with disabilities and veterans in accordance with relevant laws.

The Toss Server Team builds and maintains the core systems that keep Toss services running smoothly. As a Server Developer focused on the Messaging Platform, the work centers on supporting reliable communication across a range of customer touchpoints and affiliated companies. This role sits within the Platform Chapter, which develops shared libraries, gateways, and messaging systems. The team also maintains frameworks for logging, metrics, and other common features, enabling fast and stable service development. There is flexibility to move between chapters (Product, Platform, Productivity) after joining, matching evolving skills and interests. What you will do Build and manage messaging systems for customer communications, including push notifications, alerts, and emails. Support experimental systems for A/B testing within Toss services. Implement unified messaging solutions across affiliated companies, such as banks and securities firms. What we look for Experience designing, developing, and operating messaging systems. Background in building highly available and scalable systems. Ability to identify and resolve operational challenges in complex environments. Technologies in use Kotlin, Java, Spring MVC, Spring Boot JPA/Hibernate, MySQL, MongoDB, Redis, Kafka ELK, Prometheus with Thanos, Grafana Application tips Describe your experience with Toss's technology stack and the scale of traffic you have handled. Share examples of optimizing performance for high-traffic applications. If you have worked in mission-critical environments and taken responsibility for reliable services, highlight those experiences. Hiring process Application submission First round technical interview (30 minutes) Second round technical interview Cultural fit interview Reference check Salary negotiation Final acceptance and onboarding

Join Our Team The Global Platform team is dedicated to creating a securities trading platform (ledger system) to facilitate Toss Securities' entry into international markets. We collaborate with local system vendors and relevant institutions (exchanges, clearing agencies, banks, etc.), serving as a vital link between our headquarters in Korea and local operations. This position requires a broad understanding of securities industry systems, involving account opening, order execution, payment and settlement, deposits and withdrawals, tax compliance, and regulatory responses. Your Responsibilities Manage the schedule, resources, and risks of the securities platform construction project in collaboration with global vendors. Translate Toss's business requirements into comprehensible formats for vendors and validate implementation outcomes. Act as a communication hub between internal Toss teams (development, product, operations, etc.) and vendors. Balance local regulatory requirements with Toss's product direction, prioritizing requirements as needed. Gain knowledge in the securities domain (trading, clearing/settlement, account management, taxes, etc.) and potentially manage operations post-system launch. Serve as a bridge between the Korean headquarters team and local vendors/institutions. Ideal Candidate Experience in the financial sector, particularly in securities, banking, or insurance, is essential. Prior securities experience is preferred. Proven experience managing collaborative projects with external vendors or partners is required. A basic understanding of technical aspects (API, system architecture, databases, etc.) is advantageous. Strong communication and coordination skills in complex stakeholder environments are necessary. Willingness to travel frequently for overseas assignments is required. Experience in large-scale projects, such as next-generation system development, is a plus. Experience in overseas market entry projects (securities/finance) is preferred. English communication skills are a bonus. Application Process Application submission > Job interview > Cultural fit interview > Reference check > Compensation negotiation > Final acceptance and onboarding Please Note Any falsified information in resumes or documents, or confirmed disciplinary actions during employment history, may lead to cancellation of the application. Applicants who fall under Toss Securities' hiring restrictions or disqualifications may also face application cancellation. Individuals with disabilities or national veterans are given preferential treatment in the application process, as per relevant laws.

Join Our Dynamic TeamBe part of a team dedicated to building a robust platform that supports various growth promotions at Toss Securities, ensuring they run swiftly and reliably.Your role will focus on streamlining repetitive tasks and operational complexities, allowing product teams to concentrate on experimentation.As a Product Owner (PO), you will work within a small, autonomous team consisting of POs, developers, product designers, and data analysts, making independent decisions similar to a startup environment.The PO chapter comprises members with 2 to 15 years of diverse backgrounds, engaging in weekly discussions to share product insights and learnings.Your ResponsibilitiesDesign and enhance a common platform that spans the entire lifecycle of growth promotions.Create self-service tools enabling non-development roles to set up, operate, and verify promotions efficiently.Establish a framework ensuring financial integrity and compliance for promotions, automating experiments safely and quickly.Identify and resolve structural bottlenecks that impede the overall experimentation speed of the product organization.Define objectives for your product and align the silo's vision with user needs and Toss Securities' business strategy, creating accessible securities services for all.Oversee the complete product lifecycle, from defining key metrics to business model design, driving product growth through actionable results.Formulate valid hypotheses, validate them through data-driven insights from experiments, and continually iterate to achieve product-market fit.Hold the highest decision-making authority regarding business direction, revenue, and profit, setting goals and strategies collaboratively within your silo.Embrace the role akin to a CEO of a small startup, tackling challenges directly and defining problems to solve through various actions, experiencing both success and failure.We Are Looking ForExperience in planning and improving internal platforms or operational tools to elevate organizational productivity.Background in prioritizing common systems across multiple teams and managing stakeholder interests.Understanding the flow from setting up to operating promotions and a proven track record in structurally improving inefficiencies.Analytical mindset to structure and solve problems based on data.Direct experience in growth marketing or products, with hands-on knowledge of how promotions function in practice is a plus.Resume TipsClearly state the problem definition, hypothesis formulation, actions taken, and results achieved for each product/service/project.Highlight impacts and learning points rather than simply listing tasks to showcase your strengths.Express any quantifiable achievements or improvements in business metrics you directly contributed to.Logically document the criteria you used to determine success or failure in your product experiences.Your Journey with Toss SecuritiesApplication submission > Job interview > Cultural fit interview > Offer

About the Team You'll Join The ML Platform Team Leader will oversee the pivotal ML Platform team responsible for the enterprise's AI/ML development and operational environment. This team comprises the 'ML Ops Part', which builds and operates a stable MLOps environment based on Kubernetes, and the 'LLM Part', which leads the development of cutting-edge LLM applications along with the necessary LLM Ops environment. Upon joining, you will oversee both Parts, establishing and executing a technical strategy that provides a scalable and efficient platform, allowing data scientists and ML engineers to focus solely on model development and experimentation. You will play a crucial role in presenting the vision for the ML Platform, fostering team growth, and solidifying the foundation of the company's AI technology capabilities. Your Responsibilities Establish and lead the technical vision and long-term roadmap for the ML Platform team (ML Ops Part, LLM Part). Mentor team members, conduct code reviews, and manage performance to drive team growth. Design and oversee the operation of a scalable and reliable ML Platform (model training, deployment, serving, monitoring) based on Kubernetes. Lead the technical development of various LLM applications and establish the LLM Ops environment for fine-tuning, serving, and evaluating large-scale models. Collaborate closely with cross-functional teams, including data scientists, ML engineers, and product teams, to resolve bottlenecks in AI/ML development and maximize developer experience (DX). Continuously research the latest MLOps and LLM technology trends, design the architecture of the enterprise AI tech stack, and provide technical direction. Define and continuously improve metrics for platform stability, cost efficiency, and performance optimization. Ideal Candidate We are looking for someone with proven experience in leading engineering teams (ML, Infrastructure, Platform, etc.), successfully presenting technical visions, establishing roadmaps, and nurturing team members. A deep practical experience in building and operating MLOps platforms (e.g., Kubeflow, MLflow, CI/CD, model serving) in a Kubernetes environment is essential. A strong understanding and practical experience in developing LLM applications (RAG, fine-tuning, agents, etc.) or LLM Ops (large-scale model serving, Vector DB, evaluation pipelines) is required. Experience in designing and optimizing system architecture capable of handling large-scale traffic and data is preferred. You should be able to define complex technical problems, communicate clearly with various stakeholders, and solve issues strategically. A passion for designing and advancing the platform while considering business impact and developer experience (DX) beyond mere technical adoption is essential. Resume Recommendations Detail your contributions to leading ML platform or system projects (technical leadership, architecture design, team management, strategic planning). Clearly outline the flow of addressing technical/organizational challenges for each project, including your proposed solutions (architecture, adopted technologies), collaboration processes with team members/stakeholders, and final results (platform performance improvements, acceleration in development speed, cost reductions). Instead of simply listing tasks, include insights and learnings gained as a technical leader, along with the criteria for making technical trade-offs. Emphasize quantifiable achievements that you have led. If you have experience successfully building/operating large-scale systems through collaboration with multiple engineering teams to resolve complex technical problems, please share that. Journey to Joining Toss Bank Application submission > Job interview > Cultural fit interview > Leadership interview > Reference check > Compensation negotiation > Final acceptance Please Note Any false information found in the resume or submitted documents may lead to disqualification.

About the Team You'll JoinThe legal organization at Toss is organized into several sectors: Fintech, Platform, Global, and Corp, collectively operating under the Legal Tribe.The Platform Legal Team focuses on non-financial platform businesses, addressing regulatory issues related to e-commerce, advertising, and app services.Our approach is proactive; we engage from the conception of business ideas to construct frameworks that operate within legal boundaries.In a rapidly evolving platform environment, our key role is to ensure that laws act as facilitators for sound decision-making rather than obstacles. Your ResponsibilitiesAs the leader of the Platform Legal Team, you will establish a legal framework that enables decision-making across non-financial platform operations.You will design the transaction structures for new services/business models from the initial stages and systematically define core regulatory risks related to e-commerce and advertising.Rather than simply categorizing legal issues as “possible/impossible,” you will compare risks, uncertainties, and alternative scenarios to support rational business decisions.You will develop, agree upon, and implement risk level criteria applicable to platform operations (e.g., Red/Yellow/Green). This includes definition, organizational consensus, application processes, and case-based updates.Collaborating closely with business leaders, product owners, and compliance teams, you will summarize issues on a single page and facilitate decision-making. When necessary, you will document the rationale and conditions for decisions to ensure reusability.In the event of disputes or issues, you will not only respond but also work towards improving structures, policies, and processes from a prevention standpoint.You will operate a ‘regulatory radar’ that includes impact analyses and action plans for the rapidly changing platform, data, and privacy regulations, providing proactive support.As the team leader, you will set work priorities and quality standards while continuously enhancing team capabilities through reviews, coaching, and recruitment. Ideal Candidate ProfilePossess over 10 years of experience as a lawyer in corporate consulting or as an in-house counsel.Have direct experience leading key legal issues in non-financial business sectors, including e-commerce and advertising.Ability to articulate legal bases in terms of risk size, uncertainty, and alternatives rather than simply stating what is possible or impossible.Proven experience in resolving conflicts between business, compliance, and legal perspectives to achieve consensus and conclusion.Demonstrated leadership experience in establishing standards, gaining organizational consensus, and guiding teams towards company goals. Preferred ExperiencesRelevant work experience in e-commerce or comprehensive platform companies.Understanding of business mechanisms such as platform transaction structures (e.g., listing, mediation, direct sales, advertising products), promotion, settlement, and exposure structures.Experience in responding to data and privacy regulations, including internal policy and process design. Resume RecommendationsPlease detail how you defined issues related to fair trade or platform businesses and what alternatives you proposed.Highlight experiences where you made significant changes to decision-making and operational processes beyond simple review/advisory roles.If external disclosures are sensitive, you may anonymize or omit company names/services/numbers (e.g., “large comprehensive platform,” “average daily traffic level,” etc.). Journey to Join TossApplication submission > Job interview > Cultural fit interview > Reference check > Compensation negotiation > Final acceptance and onboarding