Backend Developer | Trading Systems

🏢 Summary: Remote B2B opportunity for a Junior Python Developer to work on trading systems, market data flows, backend services, and exchange integrations in a digital assets environment. The role focuses on Python backend development in a production setting with exposure to real-time trading infrastructure and international collaboration. 🗂️ Requirements: 1–2 years commercial Python experience, Python backend development experience, Experience with APIs and integrations, Knowledge of REST APIs, Experience with SQL, Experience with PostgreSQL or another relational database, Familiarity with Linux, Familiarity with Git, Debugging skills, Technical degree in Computer Science, Software Engineering, Mathematics, Physics, Electrical Engineering or related field, Very good English 📃 Skills: Python, FastAPI, Django, Flask, Celery, asyncio, REST, WebSocket, SQL, PostgreSQL, Linux, Git 🏢 Description: Junior Python Developer | Trading Systems Location: 100% remote from Poland Contract: B2B Budget: 10,700–21,400 PLN net + VAT / month Industry: Digital assets / trading systems We are supporting a global digital asset trading firm in hiring a Junior Python Developer to join a small, highly technical engineering team. This is a Python-first role for someone who already has commercial experience with Python and wants to develop further in a production environment close to trading infrastructure, real-time data and exchange integrations. You will work on systems supporting trading operations, market data flows, internal tools and backend services used in a live environment. What you will work on developing and improving Python backend services, building integrations with external APIs and crypto exchanges, working with REST and WebSocket APIs, processing and validating market data, developing internal tools and automation for trading operations, debugging production issues and improving system reliability, working with databases, logs and service integrations, collaborating with an international engineering team in English. What we are looking for We are looking for someone who wants to build their career in Python backend development and is comfortable using Python as their main programming language. You may be a good fit if you have: around 1–2 years of commercial Python experience , hands-on experience with Python backend development, APIs, integrations or production tools, familiarity with FastAPI, Django, Flask, Celery, asyncio or similar technologies, understanding of REST APIs, external integrations and basic database concepts, experience with SQL and PostgreSQL or another relational database, familiarity with Linux, Git and debugging, strong problem-solving skills, completed technical degree in Computer Science, Software Engineering, Mathematics, Physics, Electrical Engineering or a related field, very good English - the recruitment process and daily work are conducted in English. Why this role may be interesting 100% remote work from Poland, B2B cooperation, opportunity to work on real production systems rather than only standard web applications, exposure to market data, exchange integrations and trading infrastructure, small engineering team with direct technical ownership, strong learning environment and collaboration with experienced international engineers, opportunity to grow in Python, backend development and digital asset trading. Interested? Apply with your CV and we will contact selected candidates with more information!

🏢 Summary: Junior Python Developer role focused on backend systems supporting digital asset trading infrastructure, market data flows, and exchange integrations in a primarily remote B2B setup. The position involves building and maintaining Python services, APIs, automation tools, and production integrations within a small international engineering team. Candidates should have commercial Python experience, backend development knowledge, and availability for occasional collaboration in Warsaw. 🗂️ Requirements: 1–2 years commercial Python experience, Python backend development experience, Experience with APIs and integrations, Knowledge of REST APIs, Experience with SQL, Knowledge of PostgreSQL or another relational database, Familiarity with Linux, Familiarity with Git, Debugging skills, Computer Science or related technical degree, English level C1, Based in Warsaw or able to travel occasionally 📃 Skills: Python, FastAPI, Django, Flask, Celery, asyncio, REST, WebSocket, SQL, PostgreSQL, Linux, Git 🏢 Description: Junior Python Developer | Trading Systems Location: Poland-based, with occasional presence in Warsaw Contract: B2B Budget: 10,700–21,400 PLN net + VAT / month Industry: Digital assets / trading systems We are supporting a global digital asset trading firm in hiring a Junior Python Developer to join a small, highly technical engineering team. This is a Python-first role for someone who already has commercial experience with Python and wants to develop further in a production environment close to trading infrastructure , real-time data and exchange integrations . The role is primarily remote, but the client is building part of the team in Warsaw. Candidates should therefore be based in Warsaw or able to travel to Warsaw occasionally when needed . The exact office frequency is still being defined, but this is not a full-time office-based role. You will work on systems supporting trading operations, market data flows, internal tools and backend services used in a live environment. What you will work on developing and improving Python backend services, building integrations with external APIs and crypto exchanges, working with REST and WebSocket APIs, processing and validating market data, developing internal tools and automation for trading operations, debugging production issues and improving system reliability, working with databases, logs and service integrations, collaborating with an international engineering team in English. What we are looking for You may be a good fit if you have: around 1–2 years of commercial Python experience , hands-on experience with Python backend development, APIs, integrations or production tools, familiarity with FastAPI , Django , Flask , Celery , asyncio or similar technologies, understanding of REST APIs , external integrations and basic database concepts, experience with SQL and PostgreSQL or another relational database, familiarity with Linux , Git and debugging, strong problem-solving skills, completed technical degree in Computer Science or a related field, very good English (min. C1) - the recruitment process and daily work are conducted in English, are based in Warsaw or willing and able to travel to Warsaw occasionally. Why this role may be interesting primarily remote work, with occasional collaboration from the Warsaw office, opportunity to work on real production systems rather than only standard web applications, exposure to market data, exchange integrations and trading infrastructure, small engineering team with direct technical ownership, strong learning environment and collaboration with experienced international engineers, opportunity to grow in Python, backend development and digital asset trading. Interested? Apply with your CV and we will contact selected candidates with more information.

🏢 Summary: Senior Backend Software Engineer role in a fully remote cybersecurity product team focused on secure software supply chain solutions and AI-assisted development workflows. The position involves designing and delivering scalable backend systems, contributing to Go-based services, and working with cloud-native and containerized environments. Long-term B2B cooperation with high autonomy, enterprise-scale products, and international collaboration. 🗂️ Requirements: 5+ years of commercial software engineering experience, Backend development experience in a compiled programming language, Software architecture and distributed systems knowledge, Experience designing complete backend applications, Linux knowledge, Experience with AWS or GCP, Experience with Kubernetes and containerized environments, English level C1+, Ability to work independently in a remote international team 📃 Skills: Go, Rust, Java, C#, C++, Kotlin, Linux, AWS, GCP, Kubernetes, Docker, LLM 🏢 Description: About the Role We are looking for an experienced Senior Backend Software Engineer who enjoys building complete, production-grade systems rather than working on isolated features. We’re open to engineers with experience in any modern compiled backend programming language (such as Go, Rust, Java, C#, C++, Kotlin, or similar). Previous experience with Go is a strong advantage, but not required. You will join a highly autonomous product engineering team responsible for developing modern cybersecurity products. The company is heavily investing in AI-powered software development and Agentic AI, using LLMs as an integral part of the engineering workflow while maintaining high standards for software quality, architecture, and security. This role is ideal for engineers who combine strong backend expertise with system design skills and enjoy taking ownership of medium-complexity applications from architecture to delivery. Your Responsibilities - Design and develop scalable backend services using modern compiled programming languages. - Work with Go-based services and gradually contribute to the Go codebase. - Build secure, reliable software used by enterprise and government customers. - Design application architecture and independently deliver end-to-end solutions. - Work closely with a distributed engineering team on product development. - Contribute to cloud-native, containerized environments. - Use AI-assisted development tools and Agentic AI workflows to improve productivity while maintaining engineering quality. - Participate in code reviews, technical discussions, and architectural decisions. Must-have Qualifications - 5+ years of commercial software engineering experience. - Strong backend development experience in at least one compiled programming language (e.g. Java, Go, Rust, C#, C++, Kotlin or similar). - Solid understanding of software architecture and distributed systems. - Experience designing and building complete backend applications. - Strong Linux knowledge. - Experience working with cloud platforms (AWS and/or GCP). - Experience with Kubernetes and containerized environments. - Excellent communication skills in English (C1+). - Ability to work independently in a fully remote, international team. Nice to Have - Experience with Go (Golang). - Experience with Rust. - Interest in cybersecurity or developer tooling. - Experience working with AI-assisted development tools or LLM-based workflows. The Offer - 100% remote work. - Long-term B2B cooperation. - Performance bonus after the first year. - Company offsites and team meetups 2–4 times per year (travel costs covered). - No regular on-call rotations (only occasional weekend deployments 2–3 times per year).

🏢 Summary: Senior Backend Developer role focused on designing and delivering scalable server-side applications and APIs using Python and Django for early-stage B2B SaaS products. The position involves architectural ownership, system reliability, and performance optimization in a fully remote, full-time setup. The developer will drive backend best practices, testing, and CI/CD processes. 🗂️ Requirements: 5+ years of backend development experience, Extensive experience with Python, Extensive experience with Django, Proficiency in data modelling, Experience with relational databases, Experience with non-relational databases, Ability to write complex SQL queries, Experience with API design, Experience with system integrations, Experience with distributed systems (synchronous and asynchronous), Hands-on experience with Docker, Hands-on experience with Redis, Experience with message brokers, Experience with cron jobs, Experience writing unit tests (e.g. Pytest), Strong understanding of code quality and testing best practices, Good command of English for technical communication 📃 Skills: Python, Django, SQL, Docker, Redis, Pytest, APIs, Databases, PostgreSQL, MongoDB, CI/CD, MessageBroker, Cron, Git 🏢 Description: Senior Backend Developer (Python/Django; 100% remote) 💰 Salary: 23,400-25,500 PLN/month 🌎 100% Remote 🕦 Full-time position ☑️ B2B or Contract of Employment We are looking for a Senior Backend Developer for a partner client with a compelling mission: they act as a product and technology partner for early-stage B2B SaaS founders, helping them navigate the crucial journey from launch to their first million in revenue. They essentially become the dedicated tech backbone for these startups. Requirements: 5+ years of professional backend development experience. Extensive, proven experience with Python and the Django framework. Proficient in data modelling, relational and non-relational databases, and complex SQL queries. Strong experience with API design, integrations, and distributed systems (synchronous & asynchronous communication). Hands-on experience with Docker, Redis, message brokers, and cron jobs. Expertise in writing unit tests (e.g., Pytest) and a commitment to code quality and testing best practices. Great understanding of English with strong communication and collaboration skills. Nice to have: Previous experience in Greentech or Ecotech is a significant plus. Experience as an unofficial tech lead or mentoring junior developers. Knowledge of additional testing methodologies (integration, end-to-end). Responsibilities: Lead the design and development of complex server-side applications, APIs, and databases, taking ownership of architectural decisions. Architect, write, and deliver high-quality, scalable, and efficient code using Python and Django. Collaborate closely with cross-functional teams, including front-end developers and the tech lead, to align backend development with project goals. Architect and implement advanced user authentication, authorisation, and security mechanisms. Conduct performance analysis and optimisation, identifying bottlenecks and implementing solutions. Drive the implementation of automated testing and CI/CD processes to ensure code reliability. Establish and enforce coding standards, conduct thorough code reviews, and document backend architecture and APIs. Take responsibility for system reliability, scalability, and security, ensuring best practices. Get to know DevsData We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com

🏢 Summary: Senior Backend Developer role focused on designing and implementing core components of a high-performance trading platform in a cloud-native, microservices environment. The position involves building low-latency order management and event-driven distributed systems using Java/Kotlin on AWS. You will work within a Scrum team to deliver secure, scalable backend services for financial infrastructure. 🗂️ Requirements: Bachelor’s degree in Computer Science, IT or equivalent experience, 6+ years of experience in Java or Kotlin, Experience with Docker and Kubernetes, Strong knowledge of AWS cloud platform, Experience with CI/CD pipelines and automation, Knowledge of microservices architecture, Experience working with distributed systems, Competence in messaging systems, Experience with distributed caching, Understanding of monitoring and observability tools, English proficiency minimum B2 📃 Skills: Java, Kotlin, Kubernetes, Docker, Jenkins, GitLab, AWS, Microservices, CI/CD, Messaging, Caching, Scrum 🏢 Description: Employer: Swiss IT Company in Banking Infrastructure Rate: 6000 - 7500 Eur net per month Cooperation model: B2B Start date: ASAP Recruitment process:  3 steps (pre - screening, technical interview, technical task) Technology stack: Java or Kotlin, Kubernetes, Docker, Jenkins, Gitlab, AI Tools, AWS Team: 20-person Scrum team responsible for separate microservices We are currently looking for a Senior Backend Developer based in Poland (preferred locations: Wrocław, Poznań or fully remote). In this role, you will contribute to the design and implementation of strategic backend components within a high-performance financial technology platform. You will work on infrastructure responsible for order management, execution logic, smart routing mechanisms, and event-driven business services in a cloud-native environment. This is an opportunity to join a fast-growing, product-driven fintech organisation operating in a technically demanding domain with strong market demand and long-term growth potential. Your role is: -> Designing and implementing new releases of a core trading platform -> Contributing to architecture decisions around: low-latency order management execution algorithm smart order routing event driven and distributed systems -> Engineering and operating distributed services in cloud environments -> Collaborating closely with Product, Engineering Leadership, and cross-functional teams -> Ensuring solutions follow current industry best practices and architectural standards -> Designing with security, authentication and authorization in mind Your skills and experiences: -> Bachelor’s degree in Computer Science, IT or equivalent practical experience -> Experience with container orchestration (Docker and Kubernetes) -> 6+ years of experience in Java and/or Kotlin -> Solid understanding of monitoring, observability and diagnostics tooling -> Strong knowledge of cloud platform AWS -> Experience with CI/CD pipelines and automation -> Knowledge of microservices architecture and the ability to work within a distributed system environment -> Proven competence in messaging systems and distributed caching -> Strong spoken and written English (min B2) Nice to have: + Experience with reactive programming patterns + Strong clean-code mindset and experience with test automation Our client offers: + Great opportunity for personal development in a stable and friendly large multinational company + Frequent company events + Flexible working hours If interested, please apply safely through this portal (application rules are in accordance with GDPR). Employment agency Nr 17138.

🏢 Summary: Mid-level Full-Stack Developer role focused on building and modernizing a cloud-based practice management and CRM platform. The position involves a 60/40 split between Angular frontend and Node.js/Nest.js backend, contributing to migration from monolith to microservices and upgrading to the latest Angular version. Fully remote (Poland-based) with strong impact on architecture and product quality. 🗂️ Requirements: 2–3 years of commercial experience in full-stack web development, Commercial experience or strong willingness to work with Angular, Experience with Node.js backend development, Practical knowledge of Nest.js, Basic knowledge of SQL, Experience or willingness to implement automated E2E tests, Polish residency, Working proficiency in Polish, Notice period of 1 month or less 📃 Skills: Angular, Node.js, Nest.js, SQL, Playwright, Microservices, Cloud, ORM, E2E 🏢 Description: Position: Full-Stack Developer Location: Remote (Poland-based) Salary: 14500 – 19500 PLN / month Our client is an innovative software company delivering a modern, cloud-based practice management and CRM solution dedicated to professional services. The platform streamlines day-to-day operations, including workload management and automated document generation. The development team is highly autonomous, focused on refactoring their core product from a monolith into scalable microservices, migrating to the newest technology stacks, and fostering an environment with strong developer ownership. We are looking for a mid-level Full-Stack Developer (approx. 2–3 years of commercial experience) to join a tight-knit Polish development team. In this role, you will work on both frontend and backend tasks (approx. 60% Front-End and 40% Back-End workload), having a real impact on technology choices and product quality. Requirements: Around 2–3 years of commercial experience in full-stack web development. Professional experience or strong openness to working with Angular (the project is currently on Angular 6 and undergoing a migration to the latest stable version). Solid knowledge of backend development using Node.js, preferably with Nest.js (used for all new microservices). Basic understanding of SQL (complex queries are supported by in-house ORM and AI tools, backed by thorough code reviews). Familiarity with or interest in testing practices (manual testing with beta users and expanding automated E2E tests using Playwright ). Polish residency and working proficiency in Polish (mandatory for active participation in daily sync meetings). Notice period of 1 month or less . Mindset focused on autonomy, taking ownership of tasks, and willingness to challenge the status quo. Responsibilities: Developing new features and maintaining the cloud-based platform (60% FE / 40% BE split). Actively participating in architecture modernization (refactoring the monolith into microservices and migrating the legacy frontend to the latest Angular version). Writing clean, maintainable code and participating in peer code reviews. Ensuring software quality through self-testing and implementing automated E2E test scenarios with Playwright. Onboarding smoothly into the codebase (handling smaller bug fixes and minor features in Month 1, progressing to designing and delivering a major complex feature by Month 3). Attending daily team synchronization meetings (at 10:00 AM Polish time). Offer: Salary: 14500 – 19500 PLN / month (depending on experience). Contract type: Long-term B2B Contract (open to both permanent-like cooperation and 12-month fixed contracts). Working model: 100% Fully Remote work. Flexible working hours (with core presence during the 10:00 AM daily sync). Hardware: Company-provided laptop and necessary equipment. No on-call duties or weekend shifts. Great culture: High levels of engineering autonomy, flat structure, and direct impact on the final product. Fast recruitment process: 3 stages (1h Live Coding data processing task $\rightarrow$ ~3h Homework assignment $\rightarrow$ 1h final CTO interview) with rapid feedback provided within 1–2 business days after each stage.

🏢 Summary: Backend Developer role focused on designing and building scalable, secure microservices and APIs using Java and Spring Boot in a cloud-oriented environment. The position emphasizes strong data modeling, architecture design, and CI/CD-driven delivery within Agile teams. The contractor will develop resilient backend solutions and ensure high code quality and reliability. 🗂️ Requirements: Hands-on experience with API and Microservices development in Java or Spring Boot, Proficiency in Java/J2EE application development, Experience with Spring Framework and Hibernate JPA, Experience building and consuming REST web services, Experience working with XML and JSON, Experience with relational or NoSQL databases (Oracle, PostgreSQL, MongoDB), Experience with CI/CD pipelines and Jenkins, Experience with Docker and Git, Unix proficiency, Experience working in Agile methodologies (Scrum or Kanban) 📃 Skills: Java, Spring, SpringBoot, J2EE, Hibernate, JPA, REST, XML, JSON, Oracle, PostgreSQL, MongoDB, Jenkins, Docker, Git, Unix, CICD, Microservices, Agile, Scrum, Kanban 🏢 Description: Location : Cracow Mode : Hybrid (6 days per month at the office - flexible) Contract : B2B Rate : 160-170 PLN/h Introduction & Summary We are seeking a skilled Backend Developer who possesses a deep knowledge of data modeling and architecture. The ideal candidate should have extensive experience in API development using core Java and Spring Boot, with a strong grasp of security principles and Agile methodologies. The role requires an analytical mindset, capable of designing resilient and scalable solutions while working cross-functionally to foster collaboration and innovation. Main Responsibilities Ensure proper definition and architecture of non-functional requirements in design. Develop and grow skills in designing cloud-based, secure, and adaptable solutions. Build scalable, highly reliable product features through effective software design and implementation. Apply problem-solving and analytical skills to diverse challenges. Interact with cross-functional teams for scalable solution production. Estimate engineering efforts and develop realistic schedules. Identify and resolve complex production issues efficiently. Conduct comprehensive design and code reviews and perform unit testing. Utilize source control and bug tracking systems responsibly. Key Requirements Hands-on experience in API and Microservices development using core Java and/or Spring Boot . Proficient in application development using Java/J2EE and related technologies, including Spring Framework and Hibernate JPA. Experience in developing reusable APIs and consuming web services (REST), as well as processing data formats like XML/JSON. Expert knowledge of Agile/Scrum/Kanban development methodologies and experience with databases (Oracle, Postgre, MongoDB). Extensive knowledge of CI/CD deployment pipelines, including Jenkins, Docker, shell scripting, and GIT with Unix proficiency. Nice to Have Experience in JavaScript frameworks such as ReactJs, Node JS, Angular, and jQuery. Familiarity with JavaScript build tools and dependency management. Experience in creating responsive designs using frameworks like Bootstrap. Knowledge of GCP, GKE, AWS is an advantage. Experience or knowledge in system architecture and solution design. Hands-on experience in Python, Machine Learning, and Data Science.

🏢 Summary: 100% remote B2B contract for a senior Full Stack Developer to deliver and maintain enterprise applications, focusing on urgent project phases through July 2026. The role requires independent ownership of a client’s finance module and rapid delivery of high-quality, scalable, and secure solutions. Work includes both front-end and back-end development in a microservices-based architecture. 🗂️ Requirements: 10+ years of commercial experience, Strong experience in Java development, Strong experience with Spring Boot, Experience with microservices architecture, Experience with React.js, Full-stack development experience, Experience with REST APIs, Knowledge of integration patterns, Experience with cloud-ready applications, Ability to independently handle finance module 📃 Skills: Java, SpringBoot, Microservices, React, REST, APIs, Cloud, Integration, Fullstack 🏢 Description: 100% remote B2B: 180-190 zł/h netto + VAT Contract till end of July 2026 (chance of extension) Experience Level: 10+ years of experience Must be able to work independently and deliver quickly Must be able to independently handle the clients finance module Core Responsibilities: Develop and maintain both front-end and back-end components of enterprise applications Work on urgent deliverables for Phase 1 and potentially Phase 2 Collaborate with internal teams Ensure high-quality, scalable, and secure solutions within tight timelines Technical Skills Required: Java Spring Boot (including microservices architecture) React.js (front-end development) Strong understanding of full stack development principles Experience with REST APIs , integration patterns , and cloud-ready applications Familiarity with CI/CD pipelines , containerisation (Docker/Kubernetes) is a plus Soft Skills: Ability to work independently with minimal supervision Strong problem-solving and troubleshooting skills Excellent communication and collaboration skills What we offer: 100% remote Multisport card Private heatlhcare Life insurance

🏢 Summary: Full-time Senior Back-End Engineer (Node.js) role focused on designing and maintaining scalable, high-performance server-side applications and APIs for modern, data-driven platforms. The position involves building RESTful services, integrating with third-party systems, ensuring code quality through testing, and optimizing system reliability and performance. Hybrid work model in Warsaw with B2B or CoE contract options. 🗂️ Requirements: Strong experience with Node.js, Strong experience with Express.js, Experience building and integrating APIs (GraphQL or REST), Knowledge of OAuth, JWT, and session-based authentication, Experience with MySQL, Experience with PostgreSQL, Experience writing unit tests with Chai and Mocha, Experience using Git and version control systems 📃 Skills: Node.js, Express.js, GraphQL, REST, OAuth, JWT, MySQL, PostgreSQL, Chai, Mocha, Git 🏢 Description: Senior Back-End Engineer (Node.js) 💰 Salary: 18,700-20,900 PLN/Month 💻 Warsaw, Poland (Hybrid - 3 days in office, 2 days remote) 🕦 Full-time ☑️ B2B or CoE We’re looking for a Senior Back-End Engineer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors. Requirements: Strong experience in building server-side applications using Node.js and Express.js. Hands-on experience with API development and integration, particularly with GraphQL or RESTful services. Strong knowledge of authentication and authorization mechanisms (OAuth, JWT, session-based). Strong experience with databases such as MySQL and  PostgreSQL. Experience writing unit tests with tools such as Chai and Mocha. Strong experience using Git and version control systems. Proficiency in English (both written and spoken). Nice To have: Bachelor’s degree in Computer Science or a related field. Experience with cloud platforms (AWS, Azure, or GCP), as well as containerization and orchestration tools such as Docker and Kubernetes. Experience with microservices architecture. Experience setting up CI for static analysis and test execution. Experience developing RAG applications and storing data in vector embeddings. Key Responsibilities: Design, build, and maintain scalable, high-performance server-side applications and RESTful APIs using Node.js and Express.js. Guide and supervise the development of key code components to ensure long-term reliability and scalability. Integrate with front-end components and third-party services. Actively review the codebase, recommending and implementing refinements where needed. Write unit and integration tests and optimize performance to ensure high-quality code. Collaborate closely with cross-functional teams to define and implement technical solutions. Improve system performance, reliability, and long-term maintainability through optimization and best practices. Get to know DevsData: We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/

🏢 Summary: Senior Java Backend Engineer role focused on building and enhancing low-latency FX trading systems for a top North American bank, fully remote from Poland. The position involves developing high-performance backend services for algorithmic order management and order routing in real-time, high-throughput environments. This is a long-term opportunity to work on actively developed, large-scale trading platforms in close collaboration with traders and international teams. 🗂️ Requirements: Current professional Java programming experience, Strong understanding of algorithms, complexity and multi-threading, Deep knowledge of Java language and standard libraries, Strong knowledge of data structures and Java Collections Framework, Experience building backend services for front-office trading systems, Understanding of front-office workflows and electronic trading platforms, Experience with algorithmic order management or order routing systems, Expertise in multi-threading, event-driven systems and performance tuning, Knowledge of low-latency trading systems (microsecond level), English proficiency, Residence and legal right to work in Poland, Ability to overlap 6 hours with US Eastern Time 📃 Skills: Java, Algorithms, Multithreading, DataStructures, Collections, Concurrency, LowLatency, OrderRouting, OrderManagement, ElectronicTrading, EventDriven, PerformanceTuning, FX, Backend 🏢 Description: Join the Fixed Income Trading Systems Team at a top N. American Bank This isn’t just another dev role. It’s your chance to engineer the core of global trading. We’re talking ultra-low-latency architectures, real-time market data, and automation at scale — all in an environment where milliseconds matter and billions move. You’ll work on greenfield and semi-greenfield projects, building FX (forex) trading workflows. If you thrive on complexity, love solving performance challenges under pressure, and want to collaborate directly with traders and product teams at the sharp edge of financial technology — this is your arena. The Role at a Glance Senior Java Backend Engineer Building a FX trading systems, including high-performance backend services for algorithmic order management and order routing. 270zł - 300zł / hr B2B net + VAT Fully remote for a top N. American bank (for residents of Poland only) This role requires experience building trading systems, specifically with order routing or algorithmic order management. If you enjoy working on low-latency, high-throughput trading systems, join us and build the next generation of high-performance capital markets solutions. Why Join Us? Work on a large-scale, low-latency trading system . No Legacy: Join an actively developed system — the engineers who built it originally are still on the team. Collaborate with a world-class team of developers across North America and Europe. Enjoy the stability of a long-term, fully remote role that only a bank can offer. A successful candidate will be a very strong programmer with current Java development experience. They must also be curious, open-minded, and desire to learn new things. English proficiency is a must. This role is for developers who excel at programming core Java from the ground up, not just integrating frameworks or APIs. If you’re fascinated by understanding systems ‘under the hood,’ this role is for you. Successful candidates enjoy geeking out about data structures and debugging application performance issues. This is a fully remote backend Java development role for a developer in Poland . You will be working through a Polish company that will provide the support and administrative assistance to make you successful in the role. We are looking for people to join the team long-term. Only open to residents of Poland. Polish citizens, as well as legal residents with permission to work in Poland, are welcome. What we offer Work that matters in the financial domain: You’ll be building high performance trading system at an established financial institution. Professional growth: Collaborate with smart, highly capable developers in a supportive and challenging environment. Direct collaboration : You will work directly with the client team in North America and in Poland. 1st-tier work : This is not a technical support or legacy maintenance role. The system is functional and is actively being built and you will take part in updating it. The people who built the system are still part of the team. Long-term commitment: This is not a fixed-scope or fixed-term outsourcing role; we value people who want to grow and contribute long-term. Flexibility & remote work: Fully remote position based in Poland with increasing schedule flexibility post-onboarding. Competitive Compensation: Top pay and ample time-off options. Responsibilities Design and implement robust software solutions for FX trading systems using core Java. Build high-performance backend services that algorithmically manage and route orders. Create thorough test cases to ensure software stability and reliability. Collaborate with operations teams regarding building new features and improving existing functionality. Requirements Must have Current Java programming experience, with a strong understanding of programming concepts, including algorithms, complexity, and multi-threading, and Java’s language capabilities and standard libraries. Good knowledge of the data structures: familiarity with the Java collections framework, depth of understanding of the commonly used data structures, intuition on what to use when. Proven experience building backend services for front-office trading systems. Deep understanding of front-office workflows and electronic trading platforms (any asset class). Built or contributed to the algorithmic order management systems or order routing systems (any asset class). Expertise in multi-threading, event-driven systems, and performance tuning. Ability to break down complex workflows into maintainable, high-quality solutions. Strong communication skills and comfort working in high-stakes, trader-facing environments. Knowledge that is required for building low-latency (measured in microseconds) trading systems. Ability to align your work with a 6 hour overlap with US Eastern business hours. Nice to have Experience with trading protocols or FX trading systems. Exposure to time-series databases and market data integration. Familiarity with algorithmic workflows and pricing engines. A computer science degree from a top Polish school. The recruitment process Submit your CV. Answer a few written questions and a short programming exercise, which you can do at your own pace. Participate in an online three-stage interview process: Technical screen interview Three technical interviews with future team members Discuss your experience and skills. Solve verbal algorithm problems (focus on clarity and understanding). Tackle live coding challenges (no trick questions). Successful candidates will need to pass a standard background check.