Senior Backend Developer (F/M)

🏢 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: Backend Developer (.NET) role focused on modernizing core banking systems and payment integrations, including migration from on-premise infrastructure to cloud-based solutions. The position involves building scalable microservices and high-performance backend components within an Agile environment. Strong emphasis on reliability, performance tuning, and CI/CD practices in a fintech domain. 🗂️ Requirements: 4+ years backend development experience, Strong expertise in C#, Strong expertise in .NET Framework or .NET Core, Experience with microservices architecture, Advanced SQL Server knowledge, Experience with performance tuning and stored procedures, Hands-on unit testing experience, Experience with Azure DevOps, Understanding of CI/CD pipelines, Experience in fintech, banking, payments or trading domain, Experience working in Agile/Scrum teams, Upper-Intermediate English or higher 📃 Skills: C#, .NET, SQL, SQLServer, Microservices, Azure, AzureDevOps, CI/CD, Git, UnitTesting, Agile, Scrum 🏢 Description: Andersen is hiring a Backend Developer (.NET) in the EU for a project modernizing banking systems and payment integrations, including migration to cloud-based solutions. The customer is an international financial services company focused on digital banking, payment solutions, and credit products across multiple European markets. The company operates in a technology-driven environment, developing scalable digital platforms, automated services, and modern payment infrastructure while actively investing in fintech innovation, cloud solutions, and data-driven technologies. The project is focused on developing and modernizing core banking ecosystem and payment integrations. It also involves migrating key components from on-premise infrastructure to cloud-based solutions to improve scalability, reliability, and operational efficiency. Responsibilities: Developing high-quality backend components using C# and .NET Framework/.NET Core. Building and maintaining SQL Server database logic including stored procedures, performance-tuned queries, and data processing routines. Participating in code reviews, unit test development, and quality assurance practices. Collaborating with architects, analysts, QA specialists, and cross-functional teams within an Agile/Scrum environment. Contributing to debugging, troubleshooting, and resolution of backend issues. Working with Git-based workflows for version control and collaboration. Ensuring the reliability and maintainability of backend services and integrations. Must-haves: Experience in backend development for 4+ years. Strong expertise in C# and .NET Framework/.NET Core. Experience developing microservices systems. Advanced SQL Server knowledge, including performance tuning and stored procedures. Hands-on experience with unit testing and writing automated test coverage. Experience with Azure DevOps. Exposure to CI/CD concepts and pipelines. Experience in fintech, banking, payments or trading domains. Experience working in Agile/Scrum teams. Strong analytical, debugging, and problem-solving skills. Level of English – from Upper-Intermediate and above. Nice to Have: Experience with IBM IIB (or similar ESB/integration tools). Knowledge of the Elastic Stack (Elasticsearch, Kibana, Logstash). Knowledge of enterprise scheduling tools (e.g., Automic). Reasons why this job would be interesting to you: Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.. The opportunity to change the project and/or develop expertise in an interesting business domain. Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant. Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee. The opportunity to earn up to an additional 1,000 USD per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities. Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated. Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies). Certification compensation (AWS, PMP, etc). Referral program. English courses. Private health insurance and compensation for sports activities. Join us! Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy/pl

🏢 Summary: Backend Developer role focused on building secure, high-performance banking systems using Java and Specification Driven Development across the full SDLC. The position emphasizes daily agentic development with LLM-based tools and AI agents to accelerate analysis, design, implementation, and refactoring. Responsibilities include designing and implementing backend APIs and integrations with strong focus on quality, testing, and reliability. 🗂️ Requirements: Minimum 5 years of experience in Java web application development, Commercial experience with Spring and Hibernate, Practical experience with Specification Driven Development within SDLC, Daily use of LLM-based tools and AI agents in software development process, Experience with AI coding assistants such as GitHub Copilot, Experience in backend design including APIs and integrations, Experience with automated testing and QA practices, Understanding of Agile/Scrum and DevOps processes 📃 Skills: Java, Spring, Hibernate, SDLC, SDD, LLM, AI, GitHubCopilot, REST, API, SQL, Testing, Agile, Scrum, DevOps 🏢 Description: Dołącz do nas! Szukamy programisty/ programistki backend, który/ która w codziennej pracy wykorzystuje agentic development : narzędzia oparte o LLM , agentów AI oraz automatyzacje wspierające projektowanie i implementację systemów. Na tym stanowisku będziesz budować backend odpowiadający za wydajność, bezpieczeństwo i niezawodność systemów używanych przez miliony klientów jednocześnie rozwijając proces wytwarzania oprogramowania w oparciu o Specification Driven Development w ramach pełnego SDLC . W naszym zespole będziesz odpowiadać za: Rozwój nowych funkcjonalności w systemach bankowych. Wytwarzanie oprogramowania w oparciu o Specification Driven Development (tworzenie, doprecyzowanie i utrzymanie specyfikacji jako podstawy implementacji i testów). Codzienną pracę w podejściu agentic development : wykorzystanie LLM i agentów AI do przyspieszania analizy, projektowania, implementacji i refaktoryzacji. Projektowanie i wdrażanie rozwiązań backend (API, integracje, komponenty domenowe) z naciskiem na jakość, bezpieczeństwo i niezawodność. Zapewnienie wysokiej jakości kodu – pod kątem funkcjonalności, wydajności i niezawodności (w tym testy automatyczne). Współpracę z analitykami, biznesem i zespołami technicznymi oraz tworzenie klarownej dokumentacji (w tym dokumentacji/specyfikacji). Ta praca jest dla Ciebie, jeśli: Masz min. 5 lat doświadczenia w tworzeniu aplikacji webowych w Javie oraz pracowałeś z Spring i Hibernate. Masz praktyczne doświadczenie w SDLC realizowanym w oparciu o Specification Driven Development (praca na specyfikacjach, ich doprecyzowywanie, utrzymanie i wykorzystywanie jako źródła prawdy dla implementacji/testów). Na co dzień korzystasz z podejścia agentic development — narzędzi opartych o LLM i agentów AI w procesie wytwarzania oprogramowania (nie tylko „eksperymentalnie”, ale jako stały element pracy). Masz praktyczne doświadczenie w korzystaniu z narzędzi AI do programowania (np. GitHub Copilot lub podobnych) oraz potrafisz używać ich w sposób bezpieczny i efektywny w codziennym SDLC. Stosujesz dobre praktyki programistyczne i dbasz o wysoką jakość kodu (w tym testy i procesy QA). Swobodnie pracujesz w środowisku Agile/Scrum i dobrze rozumiesz procesy DevOps. Znasz język angielski na poziomie B1/B2 i umiesz efektywnie współpracować w zespole. Oferujemy Ci: Premię uzależnioną od wyników i zaangażowania. Prywatną opiekę medyczną dla Ciebie i Twojej rodziny na preferencyjnych warunkach. Kartę MultiSport i Ubezpieczenie Grupowe na korzystnych warunkach. System szkoleń i programów rozwojowych. Dostęp do Wewnętrznej Giełdy Pracy.

🏢 Summary: Mid-level Backend Engineer role focused on building a cutting-edge FinTech platform for interbank intraday lending using Scala in an agile startup environment. The position involves delivering scalable, testable solutions through functional programming and TDD practices. The engineer will collaborate closely with the product team to incrementally develop and enhance the platform. 🗂️ Requirements: 3+ years of software development experience, Proficiency in Scala or similar language (e.g., Haskell), Understanding of reactive programming paradigms, Understanding of functional programming paradigms, Experience working in Agile environment, Experience working within Scrum framework, Ability to write testable, deployable and scalable code 📃 Skills: Scala, Haskell, Reactive, Functional, TDD, Scrum, Agile, Blockchain, DLT 🏢 Description: Are you a passionate backend engineer ready to take your skills to the next level? Join our Product Team as we build a cutting-edge FinTech platform for interbank intraday lending. This is your chance to be part of a dynamic, VC-backed startup and play a key role in shaping both our product and our company. Why Join Us? Fast-Paced Startup : Collaborate with a smart, agile team led by our hands-on technical co-founder. Your contributions will have a direct impact on our growth. Remote-First with a Weekly Anchor: Work remotely four days a week, and meet up with the team once a week at our Wrocław office to sync, collaborate in person, and keep the momentum going. Ownership : Receive equity options and be a true stakeholder in our success. Flexibility : Take advantage of a holiday schedule that isn’t tied to any specific country. Inspiring Team Off-Sites : Twice a year, we bring the entire team together for week-long off-sites in exciting locations (think Budapest, Bordeaux, Malta, and beyond). Modern AI-Augmented Workflow: We use Claude Code daily and invest in tooling that lets our engineers focus on the interesting problems. What You’ll Do Collaborate with our team to deliver incremental value through agile, systematic development cycles. Write clean, reusable, and efficient functional code using Scala , following TDD and engaging in pair-programming as needed. Ensure our solutions are testable, deployable , and scalable . Who You Are We’re looking for a proactive, mid-level backend engineer with: 3+ years of software development experience . Proficiency in Scala , or similar languages (e.g., Haskell ). A solid understanding of reactive and/or functional programming paradigms . Knowledge of Agile principles and experience working within the Scrum framework . (Nice-to-have) Experience using AI coding assistants effectively in a professional setting — knowing how to prompt well, scope tasks, and review AI-generated code critically. (Nice-to-have) An interest in or experience with blockchain/DLT technologies . (Bonus) A degree in Computer Science or a related field. About Us We are a forward-thinking FinTech startup backed by leading venture capital. Our mission is to revolutionize interbank lending through innovative technology. Agile principles guide our work, and we are committed to fostering a supportive, growth-oriented culture. If you’re excited about solving complex challenges, making an impact, and working in an environment that values both technical excellence and collaboration, we want to hear from you! Ready to Join? Apply now and start shaping the future of finance with us.

🏢 Summary: Backend Tech Lead role focused on leading and implementing a strategic rewrite of a core financial platform module into a modern, scalable architecture. The position combines hands-on Java/Spring Boot development with architectural decision-making, API design, and integration across multiple enterprise banking systems. It involves designing high-performance backend services handling large transactional and reporting datasets. 🗂️ Requirements: 7+ years backend or fullstack development experience, Strong Java expertise, Strong Spring Boot expertise, Experience designing REST APIs, Experience as Tech Lead or technical owner, Experience designing scalable and distributed systems, Strong relational database design skills (PostgreSQL), Experience with Elasticsearch or similar search technology, Experience integrating external systems via REST or GraphQL, Experience with Docker and Kubernetes, Experience with CI/CD pipelines, Knowledge of OAuth2 and OIDC, Working knowledge of React, Working knowledge of TypeScript, Experience handling large datasets with complex queries, Ability to lead architecture and mentor developers 📃 Skills: Java, Spring, SpringBoot, REST, GraphQL, PostgreSQL, Elasticsearch, Docker, Kubernetes, CI/CD, OAuth2, OIDC, React, TypeScript, SQL, Microservices, DistributedSystems 🏢 Description: Our client is an international financial technology company building solutions that support transaction communication, balances visibility, reporting, and integrations across multiple banking systems . We are looking for a Backend Tech Lead to join a strategic rewrite of a core platform module. The role combines technical leadership with hands-on backend development , helping redesign a legacy component into a modern, scalable architecture. You will work closely with product stakeholders, platform engineers, and frontend teams to design and implement reliable, high-performance backend services that integrate multiple enterprise systems. IN SHORT: 🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice! 💰 170 - 190 PLN/h + VAT ☑️ B2B contract Your Daily Missions Lead the design and development of backend services for a core platform rewrite. Design scalable services responsible for transactions, balances, statements, and reporting data . Define API contracts and integration patterns between backend services, frontend applications, and external enterprise systems. Make key decisions around data modeling, search/indexing strategies, and performance optimization for million-row datasets with complex filtering, sorting, and pagination . Support frontend teams by ensuring API-first design and smooth integration with React applications . Ensure engineering quality through code reviews, architecture discussions, and mentoring other developers . Collaborate closely with product, frontend, and platform teams to deliver robust, production-ready systems . The Essentials We're Seeking 7+ years of experience in backend or fullstack software development. Strong expertise in Java and Spring Boot , including designing modular backend services and REST APIs. Experience acting as a Tech Lead or technical owner responsible for architectural decisions. Solid experience designing scalable APIs and distributed systems . Strong understanding of data modeling in relational databases (e.g., PostgreSQL) and designing efficient query patterns. Practical experience with Elasticsearch (or similar search/indexing technologies) for filtering, search, and aggregation over large datasets. Experience designing hybrid data architectures combining multiple data sources . Experience working with external system integrations , including REST or GraphQL APIs. Familiarity with containerized environments (Docker, Kubernetes) and modern CI/CD pipelines. Understanding of security patterns in enterprise systems (OAuth2, OIDC, authentication and authorization flows). Working knowledge of React and TypeScript , enabling effective collaboration with frontend teams. Proven ability to break down complex architectural changes into manageable development phases . Experience using AI-assisted development tools (e.g., Cursor, Claude Code, or similar agentic coding tools) and openness to experimenting with AI-driven approaches to improve development efficiency and engineering workflows . Ability to combine hands-on engineering with technical leadership and mentoring . Nice-to-Haves Experience in FinTech, banking, or enterprise integration platforms . Experience with large-scale transactional or reporting systems . Experience with GraphQL integrations . Experience with data migration or legacy system modernization . Experience designing API-first platforms . Familiarity with observability practices (logging, metrics, tracing). Understanding of database partitioning and query optimization patterns . Reasons Why You Would Enjoy Working With Us We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed. We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates. We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together. You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters. You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am. You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK. We have a flat structure - we are not a corporation and don't want to be one 🙃. We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN). We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/ .

🏢 Summary: Backend Developer (.NET) role focused on building, maintaining, and optimizing scalable backend services and APIs for global digital projects. The position involves designing microservices-based architectures, working with databases, and deploying containerized applications in Azure environments. The role includes full development lifecycle participation, from architecture and implementation to testing and production support. 🗂️ Requirements: 2+ years of experience with .NET development, Experience with Azure, Experience with Entity Framework, Experience with Docker and containerization, Knowledge of SQL Server and database principles, Understanding of Microservices architecture, Experience with RESTful API development, Experience with Git version control, Intermediate+ English level, Intermediate+ German level 📃 Skills: .NET, Azure, EntityFramework, Docker, SQLServer, Microservices, REST, Git, NoSQL 🏢 Description: Andersen is hiring a Backend Developer (.NET) to build and support scalable backend solutions for global projects across multiple industries, contributing to high-quality digital products in an international environment. Andersen is a pre-IPO software development company that provides a full cycle of services, following project management standards and best practices. For over 19 years, we have been helping enterprises and middle-sized firms transform their businesses by creating effective digital solutions using innovative technologies. Immerse yourself in a global landscape as we collaborate with enterprises spanning North America, Western Europe, Israel, Australia, and the UAE. Our diverse expertise extends across FinTech, Healthcare, Retail, Telecom, Media & Entertainment, Logistics, Travel & Hospitality, eCommerce, and more. Technology stack: .NET, Azure, Entity Framework, Docker, SQL Server, Microservices. Responsibilities: Developing and maintaining backend services using the .NET platform. Designing and implementing RESTful / Web APIs. Participating in backend architecture design and technical decision-making. Working with relational and/or NoSQL databases, including schema design and query optimization. Integrating with external systems and third-party APIs. Ensuring application security, performance, and scalability. Writing clean, maintainable, and testable code. Creating and maintaining unit and integration tests. Participating in code reviews and contributing to code quality improvements. Troubleshooting, debugging, and optimizing existing solutions. Using version control systems (Git) in daily development. Collaborating with frontend developers, QA engineers, and other team members. Participating in Agile/Scrum ceremonies (planning, estimations, retrospectives). Supporting and maintaining applications in production. Must-haves: Experience as a .NET Developer for 2+ years. Experience with Azure. Experience with Entity Framework. Proficiency in building and deploying containerized applications using Docker. Understanding of SQL Server and database principles. Knowledge of Microservices architecture and design. Excellent troubleshooting and communication skills. Ability to work in a fast-paced, team-oriented environment. Level of English – from Intermediate+ and above. Level of German – from Intermediate+ and above. Nice-to-haves: Experience with front-end development (React or Angular). Familiarity with Kafka, Kubernetes, and Jenkins. Reasons why this job would be interesting to you: Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.. The opportunity to change the project and/or develop expertise in an interesting business domain. Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant. Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee. The opportunity to earn up to an additional 1,000 EUR per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities. Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated. Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies). Certification compensation (AWS, PMP, etc). Referral program. English courses. Compensation for sports activities. Mobility benefits (e.g., Deutschlandticket, JobRad program, public transportation subsidies). Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy Join us!

🏢 Summary: Backend Developer (.NET) role focused on building and supporting scalable backend services for global projects across multiple industries. The position involves designing RESTful APIs, working with microservices architecture, and deploying containerized applications in Azure environments. The role includes backend architecture design, database optimization, and maintaining high-quality, secure, and performant solutions. 🗂️ Requirements: 2+ years of experience with .NET development, Experience with Microsoft Azure, Experience with Entity Framework, Experience building and deploying applications with Docker, Strong knowledge of SQL Server and database principles, Knowledge of Microservices architecture, Experience designing and implementing RESTful APIs, Experience with Git version control 📃 Skills: .NET, Azure, EntityFramework, Docker, SQLServer, Microservices, REST, Git, SQL 🏢 Description: Andersen is hiring a Backend Developer (.NET) to build and support scalable backend solutions for global projects across multiple industries, contributing to high-quality digital products in an international environment. Andersen is a pre-IPO software development company that provides a full cycle of services, following project management standards and best practices. For over 19 years, we have been helping enterprises and middle-sized firms transform their businesses by creating effective digital solutions using innovative technologies. Immerse yourself in a global landscape as we collaborate with enterprises spanning North America, Western Europe, Israel, Australia, and the UAE. Our diverse expertise extends across FinTech, Healthcare, Retail, Telecom, Media & Entertainment, Logistics, Travel & Hospitality, eCommerce, and more. Technology stack: .NET, Azure, Entity Framework, Docker, SQL Server, Microservices. Responsibilities: Developing and maintaining backend services using the .NET platform. Designing and implementing RESTful / Web APIs. Participating in backend architecture design and technical decision-making. Working with relational and/or NoSQL databases, including schema design and query optimization. Integrating with external systems and third-party APIs. Ensuring application security, performance, and scalability. Writing clean, maintainable, and testable code. Creating and maintaining unit and integration tests. Participating in code reviews and contributing to code quality improvements. Troubleshooting, debugging, and optimizing existing solutions. Using version control systems (Git) in daily development. Collaborating with frontend developers, QA engineers, and other team members. Participating in Agile/Scrum ceremonies (planning, estimations, retrospectives). Supporting and maintaining applications in production. Must-haves: Experience as a .NET Developer for 2+ years. Experience with Azure. Experience with Entity Framework. Proficiency in building and deploying containerized applications using Docker. Understanding of SQL Server and database principles. Knowledge of Microservices architecture and design. Excellent troubleshooting and communication skills. Ability to work in a fast-paced, team-oriented environment. Level of English – from Intermediate+ and above. Level of German – from Intermediate+ and above. Nice-to-haves: Experience with front-end development (React or Angular). Familiarity with Kafka, Kubernetes, and Jenkins. Reasons why this job would be interesting to you: Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.. The opportunity to change the project and/or develop expertise in an interesting business domain. Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant. Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee. The opportunity to earn up to an additional 1,000 EUR per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities. Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated. Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies). Certification compensation (AWS, PMP, etc). Referral program. English courses. Compensation for sports activities. Mobility benefits (e.g., Deutschlandticket, JobRad program, public transportation subsidies). Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy Join us!

🏢 Summary: Senior Backend Engineer role focused on designing and evolving a scalable microservices architecture based on DDD. The position combines backend development in .NET with architectural responsibility, API design, cloud optimization, and technical leadership within Agile teams. Work is primarily remote with occasional onsite presence in Warsaw under a B2B contract. 🗂️ Requirements: Higher technical education (Computer Science or related), Minimum 8 years of commercial software development experience, Minimum 5 years of experience designing complex microservices systems, Very good knowledge of C# and .NET, Practical experience with DDD and SAGA patterns, Experience in designing and maintaining REST and WebSockets APIs, Very good knowledge of Docker and Kubernetes, Experience working in Agile/SCRUM methodology, Ability to create architectural documentation and conduct code reviews, English at minimum B2 level 📃 Skills: C#, .NET, DDD, SAGA, REST, WebSockets, JWT, OAuth2, Docker, Kubernetes, Azure, AWS, SCRUM, CI/CD, OpenShift, Git 🏢 Description: RITS Group to firma informatyczna, która oferuje najwyższej jakości usługi programistyczne zarówno dla rynku polskiego, jak i międzynarodowego. Jesteśmy dumni, że należymy do grona najszybciej rozwijających się spółek technologicznych. Naszym priorytetem jest jakość oraz innowacyjność dostarczanych rozwiązań, a nasza kultura organizacyjna opiera się na zaufaniu, współpracy i ciągłym doskonaleniu. Poszukujemy doświadczonej osoby na stanowisko Senior Backend Engineer , która obejmie kluczową rolę w projektowaniu, rozwoju i ewolucji architektury backendowej opartej o mikroserwisy. Rola łączy odpowiedzialność techniczną, architektoniczną oraz mentoring zespołów developerskich. Oferujemy Model pracy: zdalnie + 1 dzień w miesiącu onsite Lokalizacja: biuro w Warszawie Umowa: B2B Stawka: 150 zł/h netto + VAT Obowiązki Architektura i rozwój oprogramowania: Projektowanie i wdrażanie skalowalnych, wysokowydajnych mikroserwisów zgodnie z podejściem Domain-Driven Design (DDD) Definiowanie granic mikroserwisów oraz dekompozycja aplikacji monolitycznych Projektowanie i dokumentowanie bezpiecznych API (REST, WebSockets) Implementacja mechanizmów uwierzytelniania (JWT, OAuth2) Optymalizacja wydajności, skalowalności i kosztów wdrożeń w środowiskach chmurowych (Azure, AWS) Architektura i współpraca międzyzespołowa: Współpraca z zespołem architektury, biznesem oraz Application Support Ustalanie standardów architektonicznych i technologicznych Ścisła współpraca z zespołami frontendowymi w zakresie kontraktów API Mentoring seniorów i juniorów, rozwój kompetencji zespołów Aktywne uczestnictwo i prowadzenie ceremonii Agile (SCRUM) Analiza i dokumentacja: Przekładanie wymagań biznesowych na architekturę i rozwiązania techniczne Tworzenie i utrzymywanie dokumentacji HLA, HLD, LLD lub artefaktów Agile Dokumentowanie architektury mikroserwisów, zależności, API i procesów wdrożeniowych Jakość, wydajność i bezpieczeństwo: Prowadzenie code review oraz definiowanie standardów jakości kodu Identyfikacja wąskich gardeł wydajnościowych i inicjowanie działań optymalizacyjnych Projektowanie strategii testów wydajnościowych, cache’owania i load balancingu Identyfikowanie i minimalizacja ryzyk związanych z bezpieczeństwem, integracją i skalowalnością Wymagania Wykształcenie wyższe techniczne (informatyka lub pokrewne) Minimum 8 lat doświadczenia komercyjnego w tworzeniu oprogramowania Minimum 5 lat doświadczenia w projektowaniu i budowie złożonych systemów mikroserwisowych Bardzo dobra znajomość C# / .NET Praktyczna znajomość DDD , SAGA (orchestration, choreography) Doświadczenie w projektowaniu i utrzymaniu API (REST, WebSockets) Bardzo dobra znajomość Docker oraz Kubernetes Doświadczenie w pracy w metodyce Agile / SCRUM Umiejętność tworzenia dokumentacji architektonicznej i prowadzenia code review Silne kompetencje komunikacyjne i leadershipowe Język angielski na poziomie min. B2 Mile widziane Doświadczenie z Red Hat OpenShift (RHOS) Znajomość Git workflows Tworzenie testów automatycznych (unit, integration) Budowa i utrzymanie pipeline’ów CI/CD Ta rola nie jest dla Ciebie, ale masz znajomego, który by się sprawdził? Poleć go i zgarnij nawet 5000 zł. Referral Program: Talent from your network

🏢 Summary: Backend Developer (.NET) role focused on modernizing digital payment platforms, building REST APIs, integrating financial systems, and refactoring legacy ASP.NET applications. The position involves cloud migration, backend scalability improvements, and collaboration on FinTech solutions such as digital wallets and embedded finance services. Flexible remote, hybrid, or office work options are available along with professional development and certification support. 🗂️ Requirements: 4+ years of commercial experience with .NET and ASP.NET, Experience in the FinTech domain, Strong C# development skills, Experience designing and developing REST APIs, Experience with JSON-based integrations, Experience integrating third-party APIs, Strong knowledge of SQL databases, Experience working with legacy applications, Experience working in Agile teams, Upper-Intermediate English or higher 📃 Skills: .NET, ASP.NET, C#, REST, JSON, SQL, Azure, Agile, API, FinTech 🏢 Description: Andersen is hiring a Backend Developer (.NET) for a project modernizing digital payment platforms, developing APIs, and building scalable backend solutions for financial services. The customer is a technology-driven financial services provider specializing in digital payment solutions for businesses and organizations. It helps merchants simplify payment acceptance, manage transactions more efficiently, and improve the overall customer payment experience. The company focuses on secure, scalable, and user-friendly platforms that support cashless operations, business growth, and the wider digital transformation of financial services. The project is focused on modernizing backend systems for digital wallets, acquiring services, and embedded finance solutions. It includes API development, system integrations, cloud migration, and refactoring of legacy ASP.NET components to improve scalability, maintainability, and platform architecture. Responsibilities: Designing, developing, and maintaining ASP.NET backend services. Building and enhancing REST APIs. Integrating payment-related external systems and partner APIs. Participating in backend refactoring and modernization initiatives. Supporting migration toward scalable cloud-based architecture. Improving the maintainability and performance of existing services. Collaborating with architects and integration teams. Participating in code reviews and technical design discussions. Supporting troubleshooting and resolution of production issues. Contributing to automated testing and releasing quality improvements. Must-haves: Commercial experience with .NET / ASP.NET for 4+ years. Experience working in the FinTech domain. Strong proficiency in C# development. Hands-on experience designing and developing REST APIs. Experience with JSON-based integrations and third-party API integrations. Strong knowledge of SQL databases. Experience working with legacy applications. Experience working in Agile development teams. Level of English – from Upper-Intermediate and above. Nice-to-haves: Experience with payment processing systems, POS solutions, digital wallets, merchant onboarding, or settlement systems. Experience with cloud migration or microservices transformation projects. Hands-on experience with Azure services. Experience designing or working with event-driven architectures. Reasons why this job would be interesting to you: Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.. The opportunity to change the project and/or develop expertise in an interesting business domain. Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant. Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee. The opportunity to earn up to an additional 1,000 USD per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities. Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated. Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies); Certification compensation (AWS, PMP, etc). Referral program. Private health insurance and compensation for sports activities. Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy Join us!

🏢 Summary: Senior Software Engineer role focused on backend development for an established SaaS platform using Scala and Python, with expansion of AI-powered features and integrations. The project involves building scalable backend services, integrating AI/LLM solutions, and supporting production-grade architecture and CI/CD workflows in a remote EU-based B2B engagement. 🗂️ Requirements: 7+ years of professional software development experience, Strong production experience with Scala, Strong proficiency in Python, Experience developing production-grade backend applications, Hands-on experience building and maintaining backend services, Ability to work across Scala and Python codebases, Experience with automated testing, Experience with version control, Experience with code reviews, Experience with CI/CD, Understanding of scalable and maintainable software architecture, Ability to independently solve technical problems, Strong communication skills, Fluency in Polish, Advanced English level (B2/C1) 📃 Skills: Scala, Python, REST, CI/CD, Testing, APIs, SaaS, LLM, ElasticSearch, AWS, Azure, GCP, PHP 🏢 Description: Contract: B2B Rate: 150-160 zł/h net + VAT depending on skills and experience Location: Remote within the EU Duration: 6+ months, with the possibility of long-term cooperation Start: ASAP Project: Backend engineering project focused on developing and maintaining a SaaS platform and expanding its AI-powered capabilities. Key Technologies/Areas Scala Python Backend development REST APIs SaaS platforms CI/CD Automated testing Nice to have: AI and LLM integrations, ElasticSearch, AWS, Azure, or GCP Project Overview You’ll join an existing engineering team as a Senior Software Engineer , contributing to the development and maintenance of backend services for an established SaaS platform. The role combines Scala and Python development . Scala is a core technology used within the existing platform, while a significant part of the day-to-day development will be carried out in Python. You will also support the expansion of AI-powered functionality across the product, including integrations with internal and external AI services, LLM platforms, transcription solutions, and other machine-learning-based capabilities. This is a hands-on role for an experienced backend engineer who can work independently, contribute to architectural and technical decisions, and build reliable, scalable, production-ready solutions. Responsibilities Develop, maintain, and extend backend services using Scala and Python. Design and implement scalable functionality across an existing SaaS platform. Build and expand AI-powered features within the product. Integrate internal and external AI services through APIs, including LLM-based platforms and similar tools. Support the maintenance and further development of existing Scala-based services. Develop new backend functionality primarily in Python. Design reliable and maintainable integrations between platform services and external systems. Write clean, testable, and well-documented production code. Participate in technical discussions, code reviews, and architectural decisions. Ensure the quality, scalability, performance, and security of implemented solutions. Work closely with software engineers, product teams, and other technical stakeholders. Support CI/CD processes and modern software development workflows. Troubleshoot production issues and improve the stability of existing services. Requirements At least 7 years of professional software development experience. Strong production experience with Scala . Strong proficiency in Python and experience developing production-grade backend applications. Hands-on experience building and maintaining backend services. Ability to work effectively across both Scala and Python codebases. Strong understanding of software engineering best practices. Experience with automated testing, version control, code reviews, and CI/CD. Good understanding of scalable and maintainable software architecture. Ability to independently analyze technical problems and propose practical solutions. Strong communication skills and the ability to collaborate within an international engineering team. Fluency in Polish and an advanced level of English (B2/C1) Nice to have Commercial experience working with LLMs or generative AI solutions . Experience integrating AI services or AI models into production systems. Experience building integrations with external AI platforms through APIs. Experience with AI-based transcription, speech-to-text, or related technologies. Experience with ElasticSearch . Experience with public cloud AI services available in AWS, Azure, or GCP. Experience developing or maintaining PHP applications. Previous experience working on SaaS products. Understanding of AI service scalability, monitoring, performance, and cost optimisation. Why join us? Rite NRG is a vibrant outsourcing technology company driven by the Right People. We are dedicated to empowering businesses through innovative software solutions. We focus on building strong partnerships and providing top-notch software solutions that drive real business growth. Our business model revolves around collaboration and delivering impactful results for our clients. Join us and be part of a team where great minds, Right Energy, and strong partnerships come together to shape the future of technology! Stable, long-term, full-time collaboration. Remote work within the EU and flexible working hours. High engineering culture with a focus on growth and learning. Opportunity to work on a mature SaaS platform and production AI solutions. Multinational teams. Benefits: Private medical care, Multisport card, and workation opportunities.