Senior Backend Engineer (m/f/d) at flipapp1 | Remote

Empowering every employee.Our mission is to be the world's leading AI employee experience platform by transforming the way frontline employees engage with their work.At Flip, we strive to revolutionize the employee experience for those on the frontlines, giving them a voice and access to essential company information, regardless of their location. If you are…

Ink Foundation is at the forefront of revolutionizing decentralized finance with our next-generation Ethereum Layer-2 network, expertly incubated by Kraken. Utilizing the robust Optimism OP Stack, our platform is engineered to enhance the efficiency, affordability, and accessibility of decentralized financial services. As an integral part of the Optimism Superchain, Ink merges the unparalleled security of Ethereum with exceptional execution performance, empowering developers and users to engage with DeFi at an unprecedented scale.Our mission is to construct a comprehensive ecosystem that seamlessly integrates the reliability of a global exchange with the transparency of on-chain technology. We prioritize developer empowerment, user experience enhancement, and the acceleration of decentralized application adoption worldwide. By joining Ink, you will be part of a dedicated team shaping the future of Ethereum scaling, innovative DeFi solutions, and high-caliber blockchain infrastructure.Building the Future of On-Chain TradingNado is dedicated to crafting advanced perpetual and spot trading infrastructures that harmoniously merge on-chain settlement security with off-chain matching speed. Our focus is on delivering institutional-grade trading systems that push the limits of DeFi innovation.Why Choose Us?Nado operates at the intersection of traditional finance and cutting-edge blockchain technology, developing a fully integrated trading platform that encompasses smart contracts, matching engines, market-making infrastructure, and developer tools. As a Backend Engineer at Nado, you will be engaged in building systems capable of processing thousands of transactions per second, while upholding the security and transparency standards of blockchain technology.We champion engineering excellence, deep technical acumen, and practical problem-solving. Our team comprises specialists in distributed systems, financial infrastructure, blockchain technology, and high-performance computing.Meet Your TeamYou will be part of a lean, highly specialized team committed to developing production systems that manage real financial transactions. Our engineers write Rust microservices, Solidity smart contracts, and TypeScript tooling. You will have ownership over features from smart contract deployment to backend services and developer SDK maintenance.Our Technology Stack Includes:Rust for high-performance backend services (matching engine, sequencer, gateway, signing services).Solidity for EVM smart contracts with custom optimization strategies.PostgreSQL for robust database management.

Join secfix as a Staff Product Engineer specializing in backend development with Java. We are looking for a passionate engineer who thrives in a collaborative, remote environment. You will play a crucial role in designing, developing, and maintaining our innovative backend systems, ensuring optimal performance and scalability.As a key member of our engineering team, you will work closely with product managers and other engineers to deliver high-quality software that meets the needs of our customers. Your expertise will help us to drive improvements and innovations within our product line.

Role Overview:Join our dynamic engineering team at mazehq, where you will be instrumental in advancing our innovative AI Agents and machine learning systems. This role offers an exceptional opportunity to create, develop, and enhance a product from inception to deployment, greatly impacting architecture choices, machine learning integrations, and the overall user experience. Be a part of our mission to deliver cutting-edge AI-driven cybersecurity solutions, ensuring robust integration across all layers of our technology stack.Your Impact:AI Agent Development: Take a central role in creating and scaling sophisticated AI Agents to address critical cybersecurity challenges.System Architecture & Development: Architect and build backend systems tailored for agentic workloads, prioritizing scalability, security, and maintainability.Ownership of Development Cycle: Lead the full development lifecycle, from ideation and design through to deployment and ongoing maintenance.Collaborative Integration: Collaborate closely with fellow engineers and product managers to ensure seamless integration of new features and functionalities.Performance Optimization: Regularly assess and enhance application performance, security, and scalability.Best Practices Establishment: Define and uphold coding standards and documentation practices to ensure high code quality.Rapid Prototyping: Quickly develop and iterate on new features based on user feedback and evolving requirements.Mentorship: As our team expands, mentor less experienced engineers and lead technical discussions and code reviews.Qualifications for Success:Experience: Over 7 years of backend development experience.Backend Expertise: Proficiency in backend development, particularly in RESTful API design, database management, and server-side frameworks (e.g., Python).Machine Learning & AI Knowledge: Familiarity with machine learning principles and experience integrating large language models or other AI services into production applications. Knowledge of tools such as LangChain or LlamaIndex is advantageous.Cloud Familiarity: Experience with cloud platforms (e.g., AWS) and their machine learning services, along with DevOps practices including CI/CD and containerization (e.g., Docker).

Join Synthesia as a Senior/Staff Software Engineer focused on Backend development for enterprise solutions. You will lead the design and implementation of scalable, high-performance systems that drive our innovative AI video creation platform. Collaborate with cross-functional teams, enhancing our technology stack and delivering impactful solutions that meet customer needs.

Role overview yuno seeks a Solutions Engineer based in Europe to deliver tailored technology solutions for clients. This position combines technical expertise with client interaction, supporting both customer needs and internal teams. What you will do Partner with clients to understand their requirements and recommend solutions that fit their needs Work alongside product, engineering, and other teams to design and implement technical integrations Refine and improve existing solutions to drive better results for clients and the business Contribute to project delivery from initial planning through to execution Requirements Solid technical background with strong problem-solving abilities Experience engaging with clients or external partners Ability to collaborate across multiple teams to reach common objectives

About GigsAt Gigs, we are revolutionizing the mobile services landscape by creating a platform that enables tech companies to seamlessly embed global connectivity within their products.Similar to how Stripe simplifies payment integration, Gigs empowers platforms to incorporate connectivity effortlessly—bridging the traditional telecom world with modern technology. We cater to a variety of sectors, from fintechs launching mobile services to HR platforms providing work phone plans, by automating provisioning and alleviating telecom complexities.With a dedicated team of approximately 100 professionals across the US and Europe, we are supported by nearly $100 million in funding from esteemed investors such as Ribbit Capital, Google, and Y Combinator. As one of the fastest-growing tech firms, we unite early-stage engineers, product innovators, and business strategists from renowned companies like Stripe, Airbnb, and Shopify. We are committed to addressing profound technical and regulatory challenges to ensure truly seamless connectivity.If you are fueled by curiosity, creativity, and the desire to shape the future of telecom, we would be excited to connect with you.Our ChallengesOur focus is on robust software engineering rather than hype. Carrier APIs vary significantly across different countries, providers, and regulatory environments. Real-time provisioning, porting, and eSIM lifecycle management come with strict SLA requirements. Our systems must be observable, operable, and resilient. In the event of a carrier integration failure at 3 AM in a distant market, we need to be alerted before our customers are.We operate in an environment where decades-old carrier protocols intersect with eSIMs, IoT, satellite connectivity, and the evolution towards 6G. We strive to make the traditional telecom landscape programmable for the future. As a platform company, we are focused on solving real, enduring issues that will not fade away with the next hype cycle.Our engineering team is set to double by 2026. As we embark on this next phase, we are establishing a senior individual contributor track and are looking to hire multiple staff and principal engineers. The challenges we face today are becoming more complex, with new markets, connectivity paradigms, and an architecture designed to support us for years to come, not just quarters.

Gigs builds a platform that lets technology companies add global mobile connectivity to their products. By bridging traditional telecom with modern software, Gigs removes barriers for businesses, like fintechs or HR platforms, who want to offer mobile services without telecom headaches. The team spans the US and Europe, with about 100 people and backing from investors such as Ribbit Capital, Google, and Y Combinator. Gigs brings together engineers and leaders from companies like Stripe, Airbnb, and Shopify to solve technical and regulatory problems in telecom. What you will do This Senior Platform Engineer role focuses on the infrastructure and developer tools that power Gigs’ connectivity and payment platforms. The Foundation team owns core systems used by every engineer at Gigs, including: CI/CD pipelines Cloud infrastructure Observability Deployment tools Shared platform services Expect to tackle complex infrastructure challenges and help keep Gigs’ products running smoothly at scale. What Gigs values Speed: Deliver results quickly and treat each week as a chance to achieve more. Ownership: Take initiative to solve problems, don’t wait for permission. Customer focus: Prioritize customer success alongside company goals. Embracing ambiguity: Make decisions with incomplete information and use sound judgment. Questioning norms: Challenge established methods and seek to understand their origins. Who thrives here People who enjoy complex challenges, move quickly, and take responsibility for results do well at Gigs. Curiosity, creativity, and a drive to shape the future of telecom are valued traits.

About GigsAt Gigs, we are pioneering an operating system for mobile services—a platform enabling tech companies to seamlessly integrate global connectivity into their offerings.Much like how Stripe allows businesses to implement payment solutions in moments, Gigs enables platforms to incorporate connectivity, effectively merging traditional telecom with cutting-edge technology. From fintechs launching mobile services to HR platforms providing work phone plans, we streamline provisioning and eliminate telecom intricacies.Our dynamic team, comprising around 100 individuals across the US and Europe, is supported by nearly $100 million in funding from esteemed investors including Ribbit Capital, Google, and Y Combinator. As one of the fastest-growing companies in technology, we unite early-stage engineers, product innovators, and strategic thinkers from renowned organizations like Stripe, Airbnb, and Shopify. We are addressing significant technical and regulatory challenges to ensure truly seamless connectivity.If you are fueled by curiosity, creativity, and the desire to redefine the future of telecom, we would be thrilled to connect with you.The RoleWe are on the lookout for a Senior Software Engineer specializing in Integrations who excels at the confluence of engineering and meaningful impact. You are not merely a coder — you connect systems, enable teams, and transform complexity into elegant solutions. For you, coding is a pathway to delivering business value, crafting sophisticated integrations, and enhancing product synergy. If you relish addressing challenging problems, collaborating across departments, and building the infrastructure that makes everything function seamlessly, this role is tailored for you.

Join Viktor, your AI coworker that integrates seamlessly with Slack and Microsoft Teams, connecting to a multitude of tools to drive real results for various industries including finance, marketing, operations, and engineering. We are on a mission to create a product that will revolutionize the SaaS landscape by replacing multiple tools with a single, efficient teammate.Our team is compact yet ambitious, and we are looking for a forward-thinking individual.The Short VersionAs our first Growth Analytics Engineer, you will be the custodian of data integrity. Your responsibilities will include writing SQL queries, constructing data pipelines, and developing insightful dashboards that the entire team relies on. You are proactive, seeking answers rather than waiting for direction, embodying the dual role of both engineer and analyst.What's Actually Going On HereCurrently, critical business decisions regarding retention, pricing strategies, channel optimization, and unit economics are made using individually crafted spreadsheets. While this approach has served us well thus far, it’s becoming clear that as we scale, we need a dedicated analytics layer owned by a single expert.In this role, you will lay the groundwork as our inaugural Growth Analytics Engineer, tasked with establishing the entire analytics infrastructure from data warehousing to dashboards. You will report directly to the co-founders, playing an integral role in our growth trajectory.What You'll Actually DoManage the ClickHouse data warehouse comprehensively, overseeing schema design, data ingestion, backfill processes, and performance optimizations. You will have autonomy over its structure and content.Develop and sustain data pipelines for our key data sources including Postgres, Stripe, Slack, and advertising platforms. You will not only create these pipelines but also ensure their reliability.Lead the Business Intelligence layer by creating and maintaining Hex dashboards tailored for growth, finance, support, and product insights. You will also be responsible for regularly reviewing and optimizing these dashboards to prevent clutter.Proactively address fundamental business queries such as retention cohorts, credit and unit economics, channel attribution, churn rates, and the effects of pricing changes. You will bring insights to the team as they arise from the data.Implement monitoring and alerting systems to ensure that we are promptly informed of any concerning metric changes, rather than relying on customer feedback.Collaborate closely with co-founders and various leaders throughout the organization. Your analyses will inform decisions across sales, growth, and strategy, necessitating quick prioritization and execution of tasks, while confidently challenging misaligned inquiries.

Join our innovative team at Lingarogroup as an AI/ML Engineer - Architect where you will be pivotal in shaping the future of artificial intelligence and machine learning solutions. You will architect and implement state-of-the-art AI systems that drive business value and enhance operational efficiency.Your role will involve collaborating with cross-functional teams to design robust AI frameworks, optimizing algorithms, and ensuring the scalability and performance of machine learning models.

Join Kestra as a Lead Java Software EngineerAt Kestra, our mission is to simplify orchestration and automation for teams globally. Our cutting-edge open-source platform empowers organizations to manage intricate workflows with confidence, making a significant impact across various industries. We are currently seeking a talented Lead Java Software Engineer to elevate our platform and contribute to our expanding success.In March 2026, we successfully closed a $25 million Series A funding round led by RTP Global, with additional support from Alven, ISAI, and Axeleo, backed by founders from renowned companies like Datadog, dbt Labs, and Hugging Face.Your ResponsibilitiesAs our Lead Software Engineer, you will:Enhance our core platform backend leveraging Java technologies.Develop robust enterprise solutions that cater to our clients' evolving needs.Lead and mentor a team of engineers, facilitating code reviews and providing guidance to both junior and senior developers.Serve as a bridge between technical teams and non-technical stakeholders, collaborating with Product Managers to define project roadmaps while managing technical debt.Ensure the quality of our software by overseeing CI/CD pipelines, setting SLOs/SLAs, and leading post-mortem analyses during system failures.Engage directly with customers to understand their challenges and provide effective solutions.You will thrive in a fast-paced environment where agility and customer satisfaction are paramount. We embrace innovative development tools, including AI assistants, encouraging our engineers to leverage these technologies to enhance productivity and expedite project timelines. You will also have access to leading AI models and tools to integrate into your workflow.At Kestra, we believe that exceptional engineers must fully grasp the intricacies of their work, including the business context, architecture, performance, security, and quality standards. You should be adept at reviewing and refining AI-generated code, taking ownership of the entire development lifecycle from problem identification and solution design to implementation and testing.

About GigsAt Gigs, we are revolutionizing the mobile services landscape by creating a platform that seamlessly integrates global connectivity into technology products. Much like how Stripe simplifies payment processing, Gigs enables platforms to effortlessly incorporate connectivity, merging the traditional telecom world with cutting-edge technology. Our solutions empower fintech companies to launch mobile services and HR platforms to offer work phone plans, automating provisioning and alleviating telecom complexities.Our diverse team of approximately 100 talented individuals across the US and Europe is supported by nearly $100 million in funding from notable investors including Ribbit Capital, Google, and Y Combinator. As one of the fastest-growing tech companies, we are uniting early-stage engineers, product innovators, and business strategists from leading organizations like Stripe, Airbnb, and Shopify. Together, we tackle intricate technical and regulatory challenges to create truly seamless connectivity.If you are driven by a passion for discovery, creativity, and the opportunity to shape the future of telecommunications, we invite you to join our team.The RoleIn the position of Senior Data Engineer, you will take charge of the technical roadmap necessary for scaling our data platform. Your role will be pivotal in transitioning our data stack from a solid foundation to a production-grade system that fuels both internal analytics and customer-facing data products. You will collaborate closely with a team of three, operating at the nexus of engineering, product, and business.Our data platform utilizes modern tools including BigQuery, dbt, Dagster, Fivetran, and Lightdash. We have established robust fundamentals, with over 600 dbt models, customer data exports, and an emerging Insights API supported by Lightdash and Dagster. Your focus will be on productionizing data sharing, enhancing loading and pre-processing capabilities, and enabling scalability to accommodate increasing data volumes.This position is ideal for someone with prior experience in building data platforms, who understands the essence of a

About CrackenagiFounded by former nation-state operators and leading AI researchers, Crackenagi stands as the world's premier Uncensored Vibe Hacking platform. Our mission is to empower security teams while providing enterprises with robust, verifiable security resilience.We are on an exciting growth trajectory and are looking for an AI/ML Engineer who will play a pivotal role in shaping the future of cybersecurity.Key ResponsibilitiesDesign and develop LLM-based pipelines and intelligent systems aimed at secure code comprehension and generation within production SaaS environments.Establish and oversee the infrastructure necessary for training, evaluating, and deploying LLMs, fulfilling MLOps responsibilities.Collaborate closely with data science, product, and security teams to seamlessly integrate machine learning into customer-facing features.Engage in ML/AI research and prototyping to investigate and validate cutting-edge techniques and tools.Enhance existing models for improved latency, accuracy, and cost efficiency, while implementing new methodologies as the field progresses.Ensure the protection of data integrity and security throughout the entire machine learning lifecycle.QualificationsA minimum of 3 years of experience leading applied AI projects with a proven track record of scaling LLM or multi-agent systems for production use.Extensive proficiency in Python programming.Hands-on experience with AI agent frameworks, including:Development of Generative AI Agents using Langchain, Haystack, and similar technologies;Implementation of Retrieval-Augmented Generation (RAG) with LlamaIndex and other advanced frameworks;Evaluation of AI Agent performance metrics;Integration of AI Agents within existing systems.Familiarity with cloud technologies relevant to the ML/AI ecosystem.Experience in MLOps, including infrastructure establishment, model assessment, and serving pipelines.Preferred QualificationsBackground in cybersecurity products, having worked on security-oriented software or platforms.Experience with containerization and orchestration of ML services (Docker, Kubernetes) and workflow automation.Publications or significant contributions to open-source projects in ML or security domains.Familiarity with code analysis or application security fields.

Join Lingarogroup as an AI/ML Engineer and be at the forefront of technological innovation. In this role, you will leverage artificial intelligence and machine learning technologies to develop groundbreaking solutions that enhance our financial services.

Join our team as a Lead .NET Engineer with a focus on Terraform, where your expertise will drive significant cloud migration initiatives. We are seeking a seasoned professional who thrives in high-stakes environments and is proactive in enhancing our existing systems. Rather than starting from scratch, you will leverage your extensive experience to improve our migration processes and tooling, adhering to an 'own it, make it better' mindset. When you encounter a challenge, your role will involve not just identifying issues but also debugging and fortifying our systems to ensure long-term resilience.Your contributions will directly influence engineering teams across our organization, making exceptional communication skills essential. You will need to effectively bridge gaps between teams, resolve obstacles, and align stakeholders to maintain our progress.

N-iX is on the lookout for an experienced Senior/Lead Active Directory Engineer to become a vital part of our dynamic team! Our client is a prominent player in the European online car market, boasting over 30 million monthly users and operations across 18 countries. In this pivotal role, you will significantly influence the evolution of online car marketplaces and improve the overall experience for millions of car buyers and sellers. As a Lead Engineer, your primary responsibilities will include evaluating, optimizing, and securing various inherited single-forest, single-domain Active Directory environments. You will be tasked with standardizing, hardening security, and aligning these environments with current best practices. The role emphasizes enhancing AD structure, security posture, and Group Policy management while ensuring operational consistency and evaluating integration with enterprise IAM platforms. This is a hands-on senior position requiring extensive expertise in Active Directory architecture, security, identity integration, and remediation of legacy configurations, including adherence to industry audit and compliance standards such as PCI DSS.

About the Client:The Client delivers extensive operational support and specialized services to premier insurers, brokers, fleet managers, and automotive manufacturers worldwide. With a dedicated workforce of 3,300 across ten countries, we uphold exceptional standards for over 1,200 clients, assisting the global insurance sector in managing millions of claims annually with unmatched efficiency and cost-effectiveness.The Client is initiating an exciting and transformative program, and our innovative software solutions are pivotal to this strategy, leveraging cloud computing and state-of-the-art design patterns.Role Overview:We are seeking a seasoned Lead Full Stack Engineer to integrate into our Software Development team as part of our established Scrum teams. Each agile team comprises roles in technical leadership, development, architecture, QA, product, and project management. We are looking for a robust engineering leader who merges profound hands-on development skills with an AI-first approach. This position demands an AI Champion—someone who actively employs AI tools throughout the Software Development Life Cycle and enhances engineering productivity, quality, and delivery through practical and responsible AI integration. You will not only create high-performance applications, including high-traffic customer-facing platforms, but also amplify engineering excellence by implementing modern practices, tools, and methodologies.

Shape the Future of CryptocurrencyJoin our exceptional team at Kraken, where we passionately believe in the transformative power of cryptocurrency and blockchain technology.What Sets Us Apart?Kraken is dedicated to our mission of promoting cryptocurrency adoption globally, empowering everyone to achieve financial independence and inclusivity. With over a decade of commitment to our mission and core values, we have attracted some of the brightest minds in the crypto space.Before applying, please review our Kraken Culture page to gain insights into our values and internal culture. We also encourage candidates to familiarize themselves with the Kraken app. Learn how to create a Kraken account here.As a fully remote organization, Krakenites operate from over 70 countries, communicating in more than 50 languages. Our talented professionals are pioneers in the industry, crafting top-tier crypto products for traders of all experience levels. We are committed to leading security, education, and superior client support through our platforms such as Kraken Pro, Desktop, Wallet, and Kraken Futures.Join Kraken and Help Build the Future of Crypto!

Join Yuno as a Senior Software Engineer – Platform and drive innovation in payment infrastructure!About UsAt Yuno, we are dedicated to creating a comprehensive payment infrastructure that empowers businesses globally. Our team, comprised of industry veterans in payments and IT, is committed to delivering a high-performance payment orchestrator. Our technology enables companies to harness leading payment capabilities, engage customers with confidence, and maintain uninterrupted global operations through seamless payment integrations.Your RoleAs a Senior Software Engineer – Platform / Infrastructure, you will be integral to our team, responsible for the critical infrastructure that supports numerous microservices, ensuring their safe, reliable, and scalable operation.This is a developer-centric position focused on crafting production-grade software that powers our internal platform, automation, and operational systems.You will design, create, and oversee essential platform services that simplify infrastructure complexity for product teams while ensuring reliability, scalability, and performance across Yuno’s ecosystem. Key ResponsibilitiesSoftware Engineering (Core Focus)• Architect, implement, and sustain internal platform services and tools utilizing Python and Node.js.• Create APIs, automation services, CLIs, background workers, and platform control components.• Develop tools that abstract infrastructure complexities for product teams.• Produce clean, testable, production-ready code that powers our core platform systems.Platform & Infrastructure Engineering• Manage and enhance AWS and Kubernetes environments responsible for critical workloads.• Establish and maintain GitOps workflows and deployment strategies (canary, blue/green, progressive delivery).