Backend Engineer / バックエンドエンジニア (New Bank Project)

PayPayHybrid

Hybrid Full-time

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Experience Level

Experience

Qualifications

Ideal candidates will possess a Bachelor's degree in Computer Science or a related field, with proven experience in backend development using languages such as Java, Python, or Node.js. Familiarity with microservices architecture, cloud services (AWS, GCP), and database management (SQL, NoSQL) is essential. Strong problem-solving skills and the ability to work collaboratively in a fast-paced environment are crucial. A passion for innovation and a proactive approach to challenges will set you apart.

About the job

Join PayPay as a Backend Engineer and play a pivotal role in our groundbreaking New Bank Project. We are seeking a talented engineer to advance our next-generation core banking system. At PayPay, you'll be part of a vibrant, multicultural team, where your skills in software development will contribute to shaping the future of FinTech. Embrace daily challenges, drive innovation, and help us redefine financial services with your expertise in backend technologies. This hybrid role allows you to work flexibly while collaborating with a diverse group of professionals dedicated to excellence.

About PayPay

PayPay is a leading FinTech company that has rapidly grown to over 70 million users since our inception in 2018. Our workforce reflects a rich diversity, with members from more than 50 nations, fostering a culture of creativity and collaboration. At PayPay, we believe in pushing boundaries and embracing risk to create unprecedented financial solutions. Our vision is limitless, and we are committed to delivering fast, professional, and innovative services that transform the financial landscape in Japan and beyond.

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Backend Software Engineer - Merpay

Mercari, Inc.

Full-time|On-site|Minato City, Tokyo, Japan

This role requires proficiency in the Japanese language. Please note that the job description is available only in Japanese.Backend Software Engineer - MerpayEmployment Type: Full-timeWork Style: Flexible working hours (No core time, no flexible time)Location: RoppongiFor more details, please visit our career site.About the Mercari GroupCirculating value to …

Feb 10, 2026

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Backend Software Engineer - Mercoin

Mercari, Inc.

Full-time|On-site|Minato City, Tokyo, Japan

Join us as a Backend Software Engineer for Mercoin, where your Japanese language skills will be an asset. This position is crucial for the development of innovative services in the cryptocurrency and blockchain space.About the RoleEmployment Type: Full-timeWork Style: Flexible working hours (no core time)Location: Roppongi, Minato CityFor more details, visit our career site at Job Listings.About Mercari GroupWe aim to circulate all forms of value and expand opportunities for everyone.Founded in 2013 by Shintaro Yamada, Mercari was born from a desire to create a richer society in light of the Earth's limited resources. We believe in enhancing everyone’s potential by facilitating the exchange of value beyond just physical goods and money.Through the power of technology, we connect people around the globe and strive to create a world where everyone's potential is realized. For insights into our company culture, refer to the Mercari Culture Document.Team and MissionOur engineering principles define our shared beliefs and actions, reinforcing Mercari's mission, values, and culture from an engineering perspective.Join us in our mission to innovate in the cryptocurrency space, enhancing user experiences and financial services.ResponsibilitiesDevelop and operate Bitcoin trading services.Create web applications and APIs using Go.Design interfaces for microservices using Protocol Buffers and gRPC.Analyze user behavior through quantitative and qualitative measures to improve services.Architect application requirements and select middleware.Tune performance and monitor microservices.Join us in shaping the future of digital finance!

Mar 6, 2026

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Senior Software Engineer - General Backend Development at Appier | Tokyo, Japan

Appier

Full-time|On-site|Tokyo, Japan

About Appier Appier is a leading software-as-a-service (SaaS) provider leveraging the power of artificial intelligence (AI) to enhance business decision-making. Established in 2012 with a mission to democratize AI, Appier aims to transform AI into tangible return on investment (ROI) by making software smarter. With a presence in 17 offices across APAC, Europe, and the U.S., Appier is publicly traded on the Tokyo Stock Exchange (Ticker number: 4180). For further insights, visit www.appier.com. Overseas Candidates Welcome / Visa SupportThis role is based in Tokyo, Japan. For international applicants, our Japan office offers visa sponsorship to facilitate a seamless relocation experience. About the Role We are on the lookout for a talented and experienced Senior Software Engineer specializing in General Backend Development. In this pivotal role, you will develop and sustain scalable, high-performance backend systems. A significant aspect of your responsibilities will involve diagnosing and resolving complex system performance issues and addressing intricate concurrency challenges, such as race conditions. You will collaborate closely with cross-functional teams to design and implement robust solutions that align with business objectives and guarantee the long-term stability and success of our initiatives. Key Responsibilities Design, develop, and maintain durable and scalable backend systems using Java, Python, or Go, along with frameworks like Spring, Undertow, Flask, and FastAPI. Work alongside cross-disciplinary teams, including frontend developers, product managers, and designers, to define system requirements and deliver high-quality solutions. Conduct code reviews to ensure compliance with coding standards and best practices. Identify and troubleshoot issues, while debugging and optimizing code for performance and efficiency. Engage in the full software development lifecycle, from planning and design through to implementation, testing, and deployment. Keep abreast of the latest industry trends and technologies, continuously enhancing your skill set. About You [Minimum qualifications] Proven experience in backend development with a strong grasp of scalable system design. Expertise in programming languages such as Java, Python, or Go. Strong problem-solving skills with an emphasis on performance optimization. Excellent collaboration and communication skills, with a proactive approach to teamwork.

Feb 6, 2026

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Senior Software Engineer - C++ Backend Development (Ad Cloud Bidding) in Tokyo

Appier

Full-time|On-site|Tokyo, Japan

About Appier Appier is a pioneering software-as-a-service (SaaS) firm harnessing the power of artificial intelligence (AI) to enhance business decision-making. Established in 2012, our vision centers around making AI accessible to all, with the mission of transforming AI into tangible return on investment (ROI) through intelligent software solutions. With a presence in 17 offices across APAC, Europe, and the U.S., Appier is listed on the Tokyo Stock Exchange (Ticker: 4180). For further details, visit www.appier.com. About the Role Join our Tokyo office as a Senior Software Engineer (Ad Cloud Bidding) and engage in the development of diverse platforms and services that unify data and AI for our clientele. In this role, you will play a critical part in building scalable backend systems, while also being actively involved in service operations, including deployment, monitoring, and incident management, ensuring our distributed services remain reliable and high-performing. Responsibilities Design, implement, and enhance backend services Engage in code reviews and contribute to system architecture discussions Work collaboratively with cross-functional teams to deliver robust and high-performance systems Diagnose production issues and participate in root cause analysis Assist with system deployment, monitoring, and maintenance in live environments Join on-call rotations and lead incident response as necessary About You [Minimum Qualifications] Bachelor's or Master's degree in Computer Science or a related field 3+ years of professional experience in software development Proficiency in modern C++ programming (C++11 or later) Familiarity with Unix/Linux operating systems Strong interpersonal skills, problem-solving abilities, and a sense of ownership [Preferred Qualifications] Solid understanding of system programming principles Experience in developing low-latency (millisecond-scale) and high-throughput systems (over 1K QPS per machine) Expertise in service optimization and performance tuning Familiarity with modern build systems Experience with operational automation tools [Language Requirements] Fluent in English or Chinese. Open to International Applicants/Visa SupportThis position is located in Tokyo, Japan, with visa sponsorship available for overseas candidates.

Nov 7, 2025

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Backend Engineer at Tailor | Tokyo

tailor

Full-time|On-site|Tokyo

Empower Your Ideas with TailorAt Tailor, we aim to simplify the complexities of product development, enabling anyone to become a creator. We envision a world where everyone can easily turn their ideas into reality, bridging the gap between business and engineering, and integrating diverse expertise and technology.We are looking for individuals who resonate with our mission of "democratizing product development".About Tailor PlatformWe support more people in becoming product creators by providing the Tailor Platform, a high-speed platform for building business systems.In short, Tailor Platform is a "Headless ERP for Enterprises" that offers core systems utilized by large enterprises (defined by us as those with over 3,000 employees) in a headless format.Having launched the world’s first 'Headless ERP', we significantly enhance the flexibility and scalability of ERP systems, targeting Japan's large corporations and mid-sized to large companies in the US.The Environment We Operate InGlobally, there is a growing trend among mid-sized to large enterprises to combine numerous "Best of Breed" cloud SaaS solutions instead of relying on all-in-one packaged systems for their digital transformation. Consequently, the role of core systems is rapidly evolving, necessitating the ability to adapt quickly to changing business and technology environments, along with easy and deep integration with external software via APIs.As pioneers of the Headless ERP concept, we are building the next generation of business application foundations that will revolutionize corporate activities. We are already making strides in replacing industry-leading SAP-based systems and establishing a track record with large firms employing over 30,000 people.Job ResponsibilitiesYou will be tasked with developing the platform layer of our proprietary "Tailor Platform" and the BFF (Backend for Frontend) layer for individual applications. This role aims to reduce the development period for business systems used by large enterprises to one-tenth of the usual time.This position primarily focuses on developing the platform layer or the BFF layer for individual applications. Since BFF needs to be launched rapidly, you will employ code generation, templates, and more while considering customer application requirements to develop a highly agile framework.The backend team is responsible for developing the platform layer or the BFF layer for individual applications. The tech lead will act as a playing manager, leading by example while being hands-on in the development process.Specific Duties Include:Design and develop microservices applications using GoDesign interfaces for Backend for FrontendDesign interfaces between microservices (Protobuf+gRPC / GraphQL)Implement directory services, custom databases, and gateways required for ERP systems

Apr 24, 2024

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Backend Engineer at fuku | Tokyo

fuku

Full-time|On-site|Tokyo, Tokyo, Japan

We are looking for a talented Backend Engineer to join our innovative team at fuku in Tokyo. In this role, you will be instrumental in designing and developing scalable APIs that drive our diverse applications and services. Your expertise will be crucial in enhancing our backend systems and ensuring optimal performance.Key Responsibilities:- Architect, develop, and uphold robust APIs.- Work closely with front-end developers and other team members to seamlessly integrate user-facing features with server-side logic.- Optimize applications for maximum speed and efficiency.- Diagnose and resolve technical issues to maintain high performance standards.- Produce clean, maintainable, and efficient code.

Mar 26, 2026

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Backend Engineer (Contract Position)

tailor

Contract|On-site|Tokyo

Empowering Ideas Through DeploymentAt Tailor, we strive to simplify the complexities of product development, enabling everyone to become a creator. Our vision is to allow individuals to easily realize their ideas, breaking down the barriers between business and engineering, and integrating diverse expertise and technologies.We are looking for individuals who resonate with our mission to "democratize product creation".About the Tailor PlatformWe provide the Tailor Platform, a robust system for rapidly constructing business applications, supporting more people in becoming product creators.In essence, the Tailor Platform is a "Headless ERP for Enterprises", delivering core systems in a headless format to enterprises defined as those with over 3,000 employees.We pioneered the "Headless ERP" concept, significantly enhancing the flexibility and scalability of ERP systems, and are expanding our reach to large enterprises in Japan and mid-to-large companies in the USA.▼ Reference ArticleThe Vision Behind Tailor PlatformOur EnvironmentIn the mid-to-large enterprise sector globally, there is an accelerating trend towards combining numerous "Best of Breed" cloud SaaS solutions over traditional "all-in-one" package systems for digital transformation. This evolution is transforming the role of core systems, which must now adapt quickly to the rapidly changing business and technological landscapes, requiring systems that are API-driven for seamless integration with external software.As pioneers of the Headless ERP concept, we are building a next-generation application infrastructure to revolutionize corporate activities. We have already established a solid track record in replacing SAP-based systems in leading companies and among firms with over 30,000 employees.Job ResponsibilitiesYou will be responsible for developing the platform layer of our proprietary Tailor Platform and the BFF (Backend for Frontend) layer for individual applications, aiming to reduce the development time for enterprise business systems by a factor of ten.As a contractor, you will commit to product development as part of our team, just like full-time members.Specific Duties Include:This position primarily focuses on the development of the platform layer or the BFF layer for individual applications.Since the BFF needs to be launched quickly, you will leverage code generation, templates, and other tools while considering customer application requirements to develop an agile framework.The backend team is tasked with developing the platform layer or the BFF layer for individual applications. Given the need for rapid deployment of the BFF, the team will create highly agile frameworks by utilizing code generation and templates, closely aligning with customer requirements. The tech lead will serve as a hands-on manager, guiding the team by example.In particular, you will:Design and develop microservices applications using GoDesign interfaces for Backend for Frontend solutionsCollaborate with cross-functional teams to meet project goals

Apr 25, 2024

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Staff Software Engineer - C++ Backend Development (Ad Cloud Bidding) - Tokyo Relocation Required

Appier

Full-time|On-site|Tokyo, Japan

About Appier Appier is an innovative software-as-a-service (SaaS) company that harnesses the power of artificial intelligence (AI) to enhance business decision-making processes. Established in 2012 with a commitment to democratizing AI, Appier's mission revolves around transforming AI into tangible ROI through intelligent software solutions. With a presence in 17 offices across Asia-Pacific, Europe, and the United States, Appier is listed on the Tokyo Stock Exchange (Ticker number: 4180). For more details, visit www.appier.com. About the Role As a Staff Software Engineer in the Ad Cloud Bidding team at our Tokyo office, you will be instrumental in architecting and developing a diverse array of platforms and services that connect our customers and users with data and AI. In this role, you will be responsible for designing scalable and high-performance backend architectures, as well as owning and directing the technical roadmap for significant projects. Your responsibilities will also include ensuring the reliability, availability, and efficient deployment of large-scale distributed systems.

Nov 7, 2025

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Senior Backend Software Engineer

Tektome

Full-time|On-site|Tokyo

About UsAt Tektome, we are pioneers in technological innovation within the Architecture, Engineering, and Construction (AEC) industry. Our mission is to elevate standards of excellence, push the limits of technology, and reshape the AEC landscape. As a spin-off from one of Japan's earliest AI firms, Incubit, we are seeking passionate professionals who share our vision. If you are a developer eager for challenges and excited to contribute to a groundbreaking tech firm, Tektome is the perfect place for you.Role OverviewAs a Senior Backend Software Engineer, you will play a vital role in architecting, developing, and maintaining robust, high-performance backend systems. This position merges hands-on coding with strategic planning and team collaboration to fulfill our technical vision. We value engineers who can create backend systems that ingeniously utilize various databases and their structures, enabling a cohesive ingestion, storage, and computation layer for AEC data types (including 3D geometry and raster data), which can be leveraged by AI systems.

Apr 2, 2025

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Backend Engineer (Ruby) at KOMOJU | Remote

KOMOJU

Full-time|Remote|Remote — Musashino, Tokyo, Japan

About KOMOJUKOMOJU stands as the premier cross-border payment gateway in Japan, empowering companies such as the video game distribution platform Steam and the widely-used mobile app TikTok. We serve thousands of merchants by providing the essential payment infrastructure they require, through developer-friendly APIs and integrations with popular platforms like Shopify and Wix, enabling our merchants to thrive in expanding markets.What You Can ExpectAt KOMOJU, we maintain a product-focused approach, which means your contributions will directly impact our payment gateway and various projects geared towards shaping the future of KOMOJU. You'll collaborate with fellow engineers in a flat, inclusive environment where every engineer has a voice in critical product and technology decisions. Our self-organizing culture empowers engineers to take ownership of their work, play to their strengths, and explore areas for growth within the team, ensuring you are the primary driver of your career development.International at Our CoreOur engineering team is predominantly comprised of members from outside Japan, with English as the primary language of communication. Many team members are bilingual, reflecting our commitment to diversity and seamless collaboration across teams. To foster this culture, we offer all employees the option of taking English or Japanese lessons.About the PositionWe are on the lookout for a talented backend engineer to enhance our platform, enabling it to manage payments on a global scale. Your main focus will be on Ruby, primarily working with Ruby on Rails (90% of tasks). Given that we are still expanding our front-end team, you may occasionally be asked to engage in front-end tasks (less than 5% of tasks). Additionally, you will handle tasks related to Monitoring and Observability using Terraform and DataDog (less than 5%).Your typical responsibilities will involve adding new APIs for front-end interfaces within our Ruby on Rails application, troubleshooting payment issues in collaboration with partners, and enhancing the reliability and observability of our systems through Terraform to ensure optimal performance. You will work closely with product managers to critically assess requirements and translate them into effective code. Collaborating with your peers, you will also provide constructive feedback during code reviews, seek refactoring opportunities, and contribute to the improvement of our codebase. Mentorship from managers and senior developers will be available to facilitate your skill development, as we prioritize realizing your growth potential.

Jan 26, 2026

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Backend Engineer / バックエンドエンジニア (New Bank Project)

PayPay

Full-time|Hybrid|Hybrid

Jan 23, 2026

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Backend Software Engineer (C++) - Revolutionize Robotics

Mujin Inc.

Full-time|On-site|Tokyo, Japan (MJHQ)

Mujin is at the forefront of industrial automation, developing MujinOS, an intelligent operating system designed for industrial robotics. By harnessing real-time digital twins, MujinOS effectively connects and orchestrates various equipment, enabling fully autonomous operations.Our core innovation, Machine Intelligence (MujinMI), represents a groundbreaking approach that offers advanced algorithms for perception, planning, and control, tackling the most complex automation challenges.Recognized by leading global companies, we are transforming supply chain efficiency. With our headquarters in Japan and expanding teams across China, the US, and Europe, we invite you to be part of a vibrant team where you can contribute to shaping the future of automation.We are seeking a dedicated Backend Engineer to design, develop, and manage the core backend systems that underpin our industrial robotics platforms. In this role, you will assume full responsibility for backend components that support robot controllers, collaborating closely with hardware, sensors, and operating systems to deliver dependable, high-performance systems in production settings. You will focus on designing and maintaining low-latency services, data-intensive pipelines, and resilient communication paths that significantly impact system performance on the factory floor. This position demands strong systems thinking, a commitment to performance and reliability, and the ability to independently drive improvements within complex and evolving systems.

Mar 9, 2023

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Senior Software Engineer (Backend - Python/Django)

Kraken

Full-time|On-site|Tokyo

Join us in leveraging technology to create a significant positive impact on the environment!Kraken is at the forefront of groundbreaking advancements in the global energy sector.As a technology-driven company, we're dedicated to establishing a more intelligent and sustainable energy ecosystem. Our initiatives aim to optimize renewable energy generation, develop smarter grids, and empower utilities to enhance customer experiences, ultimately revolutionizing the energy industry for the benefit of all.This is an exhilarating time to be involved in energy. Join us in making a meaningful contribution to a more sustainable future.Our TeamOur engineering team consists of approximately 800 skilled professionals from diverse disciplines, including backend, frontend, and mobile engineers, who collaborate closely with UX specialists, copywriters, and designers. We adopt a Kanban-like methodology, utilizing tools such as Google Docs and Asana for work management, GitHub and CircleCI for our continuous delivery pipeline, and Sentry and Cloudwatch for performance monitoring. Kraken is an excellent environment for growth, where you'll learn from talented engineers and enhance your skills. Some of our coding standards are open-source.We uphold high engineering standards, practicing pair programming, conducting thorough code reviews, and maintaining rapid, high-value testing suites. Our culture fosters continuous learning through weekly tech talks, monthly blitz days (focused on tool enhancement and dependency upgrades), and active participation in tech meet-ups and conferences.Our coding conventions are open-source and we maintain a tech blog to showcase our work.At Kraken, you will thrive, collaborate with exceptional engineers, and elevate your technical expertise.Our TechnologyOn the backend, we primarily utilize Python, with most of our applications powered by Django, Django REST Framework, and GraphQL (Graphene). Our infrastructure heavily relies on AWS to support a continuous deployment pipeline. For more insights, check out our article on Django, ELB health checks and continuous delivery.

Apr 30, 2025

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Senior Rust Backend Engineer for Innovative Trading Infrastructure

startale

Full-time|Remote|Japan; Remote; Singapore

About Us At startale, in collaboration with one of the world's largest financial conglomerates, we are on a mission to revolutionize the trading landscape by bringing Japanese equities on-chain. Our goal is to establish a secure, transparent, and high-performance trading infrastructure capable of supporting institutional trading volumes while remaining accessible to retail investors. We are developing a cutting-edge decentralized exchange featuring a fully on-chain order book, designed with a custom state transition function and a consensus layer specifically for high-performance, low-latency trading. Our aim is to create a trustless platform that matches the speed and efficiency of traditional trading engines while maintaining complete transparency by executing as close to the blockchain as possible. Position Overview We are looking for a Senior Rust Backend Engineer with substantial experience in constructing high-performance, reliable trading APIs (HTTP & WebSocket). In this role, you will be responsible for the design, implementation, and optimization of the backend services that power our trading interfaces, ensuring low latency, resilience, and accuracy under load. You will engage with high-throughput, real-time systems that manage order and trade data ingestion, handle live WebSocket feeds, and maintain the internal consistency of state from streaming market events. The ideal candidate will be a proficient Rust engineer and a systems thinker, able to reason about concurrency, data flow, and observability in production environments. This position provides a unique chance to influence the architecture of our trading backend at an early stage, collaborating with a distributed team of experienced engineers to build next-generation financial infrastructure.

Feb 12, 2026

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Backend Engineer - Enterprise

xAI

Full-time|On-site|Tokyo, JP

About xAIAt xAI, we are on a mission to develop cutting-edge AI systems that comprehensively understand the universe, empowering humanity in its journey for knowledge. Our compact yet dynamic team thrives on engineering excellence and is composed of passionate individuals who relish challenges and are driven by curiosity. We foster a flat organizational structure where every team member actively contributes to our collective objectives. Leadership opportunities are available for those who demonstrate initiative and consistently deliver outstanding results. Strong work ethic and prioritization skills are crucial. Furthermore, effective communication is essential, as all employees are encouraged to share insights clearly and concisely with their peers. About the TeamThe Enterprise Agents Engineering Team at xAI is comprised of innovative builders tackling the most complex problems in applied AI. We focus on integrating with intricate systems, orchestrating sophisticated workflows, and leveraging AI to revolutionize business operations. Our team is responsible for full-stack solutions, overseeing product execution from inception to deployment. We collaborate closely to infuse state-of-the-art AI advancements into robust, user-centric solutions. Through an iterative development approach, we engage with customers to gather feedback, refine features, and evolve our products to solve real-world challenges.About the RoleThe ideal candidate should possess the following qualifications:Proficient in either Rust or C++ programming languages.Proven experience in designing, implementing, and maintaining reliable, horizontally scalable distributed systems.Strong understanding of service observability and reliability best practices.Familiarity with widely-used databases such as PostgreSQL, Clickhouse, and CockroachDB.Additionally, candidates with the following skills will stand out:Advanced knowledge of Python programming.Experience with Docker, Kubernetes, and containerized application development.Expertise in TypeScript.Proficient in gRPC including unary, response streaming, and bi-directional streaming.

Dec 29, 2025

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Senior Backend Software Engineer - OJM Team at Appier | Tokyo, Japan

Appier

Full-time|On-site|Tokyo, Japan

About Appier Appier is a forward-thinking software-as-a-service (SaaS) firm harnessing the power of artificial intelligence (AI) to enhance business decision-making. Established in 2012, our vision is to democratize AI, transforming it into tangible returns on investment (ROI) by delivering intelligent software solutions. With 17 offices across the APAC region, Europe, and the U.S., Appier is publicly traded on the Tokyo Stock Exchange (Ticker: 4180). For more insights, visit www.appier.com. Open to overseas candidates/Visa Support This role is based in Tokyo, Japan. Our Japan office offers visa sponsorship to assist international candidates in their transition. About the Role As a Senior Software Engineer specializing in Backend Development, you will be instrumental in designing and constructing scalable, high-performance backend architectures for our OJM (Omni-channel Journey Map) and Aideal platforms. Your responsibilities include steering the technical roadmap for significant projects, mentoring junior engineers, and fostering a high-performing, agile team environment through collaboration with cross-functional teams.

Feb 2, 2026

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Backend Product Engineer - Mercoin

Mercari, Inc.

Full-time|On-site|Minato City, Tokyo, Japan

Join Our Team as a Backend Product Engineer at MercoinWe are looking for a passionate Backend Product Engineer to join our Mercoin team at Mercari! In this role, you will develop and maintain our innovative cryptocurrency and blockchain services, enhancing the user experience and empowering financial transactions.This position requires proficiency in Japanese. Please note that the job description is only available in Japanese.About MercariShaping a Sustainable Future Through Value ExchangeFounded in 2013 by Shintaro Yamada during a global journey, Mercari aims to tackle the challenges posed by our finite resources. Our mission is to circulate all forms of value—beyond just physical goods and currency—enabling everyone to achieve their aspirations and contribute to society. With the power of technology, we connect people around the globe, creating a world where everyone's potential can be realized.Our Engineering CultureOur engineering principles embody the beliefs and actions that shape our organization. These shared values define our mission, culture, and vision, guiding us toward our long-term objectives. For more details, visit our Engineering Culture Page.About the Mercoin Backend TeamOur focus is on developing services related to cryptocurrencies and blockchain.We aim to simplify financial services through innovations such as receiving sales proceeds in Bitcoin and integrating credit, cryptocurrency, and asset management functions into a unified wallet experience.We are pioneering new transaction methods by leveraging blockchain technology for value exchanges, including NFTs.Our team develops core backend systems for cryptocurrency trading and user management, collaborating closely with product and trading teams to drive product growth.ResponsibilitiesDevelop and operate Bitcoin trading servicesCreate web applications and APIs using GoDesign interface specifications between microservices using Protocol Buffers and gRPCAnalyze user behavior logs to measure effectiveness and improve servicesDesign architecture based on application requirements and select suitable middlewareOptimize performance, monitoring, and alerting for microservicesDevelopment EnvironmentProgramming Language: GoInfrastructure: Google Cloud Platform (Compute Engine, Kubernetes Engine, Spanner, Cloud Storage, Pub/Sub, etc.)Configuration Management: TerraformAnalytics: BigQuery / Looker / Data StudioMonitoring: Datadog / PagerDutyCI/CD: CircleCI

Mar 6, 2026

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Backend Engineer at fuku | Tokyo, Japan

fuku

Full-time|On-site|Tokyo, Tokyo, Japan

Join our innovative team at fuku as a Backend Engineer! In this role, you will be responsible for building scalable APIs and microservices that drive our applications' growth and performance. You will design and implement effective database schemas for both SQL and NoSQL databases, while also developing and maintaining RESTful APIs for seamless integration with front-end and third-party services. Your expertise in optimizing system performance will be crucial in ensuring the reliability and scalability of our backend services.

Mar 26, 2026

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Backend Engineer (AI/LLM) - Mercari Marketplace

Mercari, Inc.

Full-time|On-site|Minato City, Tokyo, Japan

Join Our Team as a Backend Engineer (AI/LLM)Are you passionate about harnessing the power of artificial intelligence and large language models to create innovative solutions? At Mercari, we are looking for a skilled Backend Engineer to join our dynamic AI/LLM team within the Mercari Marketplace. Your expertise will help us design, develop, and maintain robust backend systems that drive our cutting-edge AI and machine learning applications.Your role will involve close collaboration with machine learning researchers, data scientists, and other stakeholders to deliver impactful user experiences. If you are eager to make a difference and contribute to a mission that empowers people through technology, we would love to hear from you!

Feb 13, 2026

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Staff Software Engineer, Data Backend at Appier | Tokyo, Japan

Appier

Full-time|On-site|Tokyo, Japan

About Appier Appier is a pioneering software-as-a-service (SaaS) company harnessing the power of artificial intelligence (AI) to transform business decision-making. Established in 2012 with a mission to democratize AI, Appier strives to convert AI innovations into tangible ROI by crafting intelligent software solutions. With a presence in 17 offices across APAC, Europe, and the U.S., Appier is publicly traded on the Tokyo Stock Exchange (Ticker number: 4180). For more information, visit www.appier.com. About the Role Join Appier as a Staff Software Engineer specializing in Data Backend, where your contributions will be pivotal in developing essential components of our advanced platform. Our solutions leverage proprietary deep learning and machine learning technologies, empowering businesses to convert data into actionable insights and informed decisions. Responsibilities Design, develop, and maintain RESTful APIs utilizing Python. Build and manage scalable data warehouses using Trino/Presto and Pinot. Create and implement data pipelines with Apache Airflow and Apache Spark. Collaborate with cross-functional teams to develop automation tools that enhance operational efficiency. Establish cutting-edge monitoring and alerting systems to guarantee peak system performance and reliability. Respond promptly to application queries, ensuring high levels of client satisfaction. Work with cloud platforms such as AWS and GCP to optimize data management operations. Leverage Kubernetes (k8s) for efficient container orchestration, deployment, and scaling of applications. About You [Minimum Qualifications] Bachelor's or Master's degree in Computer Science. 3+ years of experience in building and managing large-scale distributed systems or applications. Proficient in Kubernetes development and comfortable with Linux/Unix environments. Experience in managing data lakes or data warehouses. Strong background in developing data structures and algorithms on Big Data platforms. Ability to work effectively and autonomously in a dynamic and fast-paced environment. Skilled in multitasking and managing various projects within a collaborative team. Passionate about making a significant impact through self-motivated learning and innovation. [Preferred Qualifications] Contributions to open source projects are highly regarded.

Feb 4, 2026

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