Senior Backend Developer (F/M)

🏢 Summary: Oferta B2B dla doświadczonego programisty back-end .NET przy rozwoju i utrzymaniu systemów dla dużej instytucji publicznej. Rola obejmuje projektowanie komponentów back-endowych, baz danych i REST API, testowanie oraz pracę w zespole Agile/Scrum. Praca hybrydowa z dwoma spotkaniami miesięcznie w biurze klienta w Warszawie, ze stawką 145–170 zł netto/h. 🗂️ Requirements: Wykształcenie wyższe, Minimum 5 lat doświadczenia w projektach IT, Minimum 3 lata doświadczenia w projektach o wartości co najmniej 100 000 zł netto, Bardzo dobra znajomość C#, Doświadczenie z .NET Core w aplikacjach webowych i desktopowych, Doświadczenie w projektowaniu i implementacji REST API, Znajomość wzorców projektowych, Clean Architecture i DDD, Znajomość MS SQL i PostgreSQL, Umiejętność optymalizacji SQL, tworzenia indeksów i procedur składowanych, Znajomość Entity Framework Core i Dapper, Znajomość JWT, OAuth2 i FIDO2, Umiejętność tworzenia testów jednostkowych i integracyjnych, Znajomość Azure DevOps i Git, Doświadczenie w Agile/Scrum, Angielski umożliwiający korzystanie z dokumentacji technicznej 📃 Skills: C#, NET, REST, SQL, MSSQL, PostgreSQL, EntityFramework, Dapper, JWT, OAuth2, FIDO2, AzureDevOps, Git, Agile, Scrum 🏢 Description: .NET Developer 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. Lokalizacja: hybryda / 2 spotkania w miesiącu w biurze Klienta w Warszawie Stawka: 145–170 zł netto/h na B2B O stanowisku Poszukujemy doświadczonego Programisty Back-end , który dołączy do zespołu realizującego projekt informatyczny dla dużej instytucji sektora publicznego . Projekt obejmuje rozwój i utrzymanie rozwiązań informatycznych wspierających realizację kluczowych procesów oraz obsługę dużej liczby użytkowników i danych. Poszukujemy osoby, która będzie odpowiedzialna za projektowanie, rozwój i optymalizację komponentów back-endowych oraz współpracę z pozostałymi członkami zespołu projektowego. Obowiązki projektowanie i wytwarzanie oprogramowania zgodnie z dokumentacją projektową, projektowanie, tworzenie i optymalizację baz danych, projektowanie i budowanie interfejsów komunikacyjnych pomiędzy serwerem a klientem ( REST API ), testowanie i debugowanie oprogramowania, raportowanie realizowanych prac, współpracę z zespołem projektowym w ramach metodyk Agile/Scrum . Wymagania wykształcenie wyższe, minimum 5 lat doświadczenia zawodowego w realizacji projektów informatycznych, minimum 3 lata doświadczenia , zdobytego w projektach o wartości co najmniej 100 000 zł netto , bardzo dobrą znajomość języka C# , doświadczenie w pracy z platformą .NET Core , zarówno przy aplikacjach webowych, jak i desktopowych, praktyczne doświadczenie w projektowaniu i implementacji REST API , znajomość wzorców projektowych oraz praktyczne doświadczenie w implementacji architektur Clean Architecture i Domain-Driven Design (DDD) , znajomość relacyjnych baz danych MS SQL i PostgreSQL , umiejętność optymalizacji zapytań SQL, tworzenia indeksów oraz procedur składowanych, znajomość technologii ORM: Entity Framework Core oraz Dapper , znajomość mechanizmów uwierzytelniania, autoryzacji i szyfrowania danych, w szczególności JWT, OAuth2 i FIDO2 , umiejętność tworzenia testów jednostkowych i integracyjnych , znajomość Azure DevOps oraz systemów kontroli wersji, w szczególności Git , doświadczenie w pracy zespołowej w metodykach Agile/Scrum , znajomość języka angielskiego na poziomie umożliwiającym swobodne korzystanie z dokumentacji technicznej. 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 Nie zwlekaj i zaaplikuj już teraz! 9/8/2026/r/3737

🏢 Summary: Hybrid Backend Developer role focused on building, testing, and maintaining reliable digital banking services in an agile team. The offer combines Java microservices development with ownership of test automation and backend quality, plus occasional business analysis support. Work is hybrid in Warsaw, with a long-term B2B engagement and a rate of up to 160 PLN net plus VAT per hour. 🗂️ Requirements: Java 21+, REST API and microservices development, Spring Boot 3.4 and Spring WebFlux, Hibernate, Git, Maven and Jenkins, Oracle DB, DB2 and SQL, SOLID principles, Test automation, Performance, unit, integration and API testing, Cucumber and WireMock, AI tools 📃 Skills: Java, REST, Microservices, SpringBoot, WebFlux, Hibernate, Git, Maven, Jenkins, Oracle, DB2, SQL, JUnit5, Cucumber, WireMock, AI 🏢 Description: General info: Model of work: hybrid (3 days work from office Warsaw) Type of contract: B2B, long-term cooperations Rate: up to 160 PLN nett + vat/ hour Introduction & Summary Looking for an experienced Backend Developer with a strong focus on testing and a willingness to engage in a blended capability role. This position offers the opportunity to work within an agile team while driving the quality and reliability of digital banking solutions. Main Responsibilities Design, develop, test, and maintain backend services that power our digital banking platforms. Drive backend testing activities within a dedicated agile team, ensuring high-quality, reliable, and scalable solutions. Collaborate closely with business stakeholders to understand requirements and contribute to solution design. Support analysis activities when needed, helping to translate business needs into technical solutions. Leverage AI-powered tools as part of daily development, testing, and delivery practices. Contribute to the full product lifecycle, from technical design and implementation to continuous improvement and operational support. Work collaboratively within a cross-functional agile team to deliver customer-focused digital banking services. Key Requirements Proficient in Java 21+, Rest API, and microservices. Experience with Spring Boot 3.4, Spring WebFlux, Hibernate, Git, Maven, Jenkins, Oracle DB/DB2/SQL, and Junit5. Knowledge of SOLID principles. Proficient in test automation, performance, unit, integration, and API testing. Familiarity with tools like Cucumber and WireMock. Experience in using AI tools. Nice to Have Frontend experience with JavaScript, TypeScript, Angular 2+, and Angular.JS. Familiarity with Playwright and qTest. ISTQB Foundation certification. Experience with Gherkin.

🏢 Summary: Long-term B2B opportunity on a global banking platform supporting corporate lending for enterprise clients. The role involves full-stack development of new features and modules using modern Java, Spring Boot, Angular, and cloud-native tooling in hybrid Warsaw or Kraków collaboration. 🗂️ Requirements: 4+ years of commercial backend or frontend development experience, Full-stack technology understanding, Java 8/17, Spring Boot, Hibernate, Oracle PL/SQL, Liquibase, Angular 19/20, Nx, Micro-frontend architecture, Jest, NgRx, CI/CD experience, Bitbucket, Jenkins, SonarQube, Kubernetes, ELK Stack, Advanced English (C1+) 📃 Skills: Java, Spring, Hibernate, Oracle, Liquibase, Angular, Nx, Jest, NgRx, Bitbucket, Jenkins, SonarQube, Kubernetes, ELK 🏢 Description: RITS Group is an IT company delivering high-quality software development services to clients across Poland and international markets. We are proud to be among the fastest-growing technology companies. Our focus is on quality, innovation, and delivering reliable solutions, while our culture is built on trust, collaboration, and continuous improvement. Project Details 📍 Work model: Hybrid – Warsaw or Kraków (1–2 office visits per week) 💰 Rate: 155–165 PLN/hour (B2B) 🌍 English: Advanced (C1+) 🏦 Industry: Banking About the Project You will join a global banking project focused on developing and enhancing a platform that supports corporate lending processes for large enterprise clients. The team continuously delivers new business initiatives, expands existing modules, and implements solutions tailored to multiple international markets. The platform has been running successfully in production for several years and is one of the bank's core business applications used worldwide. With more than 20 extensive modules, the project offers the opportunity to solve complex business and technical challenges while collaborating with international teams and gaining deep knowledge of advanced financial processes. We offer: 📍 Work model: Hybrid – Warsaw or Kraków (1–2 office visits per week) 💰 Rate: 155–165 PLN/hour (B2B) 🌍 English: Advanced (C1+) 🏦 Industry: Banking Long-term cooperation on a stable, business-critical project with significant scale and complexity. A modern technology stack, consistently maintained at no more than one version behind the latest release. Opportunity to work on a globally used enterprise platform. Collaboration with highly experienced engineers and technology experts. Strong engineering culture focused on code quality, best practices, and technical excellence. Access to our internally developed AI ecosystem and Large Language Model (LLM) solutions. A development-focused environment, with significantly more feature delivery than maintenance work. Responsibilities: Design, develop, and enhance solutions aligned with the long-term product roadmap. Collaborate with international cross-functional teams to design and implement new features. Ensure high code quality through testing, code reviews, and adherence to development standards. Estimate development effort, plan tasks, and provide regular status updates to stakeholders. Support and mentor team members while actively sharing technical knowledge and best practices. We are looking for: At least 4 years of co mmercial experience in backend or frontend development, with a solid understanding of the full technology stack. Strong knowledge of: Java 8/17, Spring Boot, Hibernate, Oracle PL/SQL oraz Liquibase Frontend experience with: Angular 19/20, Nx, Micro-frontend architecture, Jest, NgRx Experience with CI/CD tools and processes , including Bitbucket, Jenkins, and SonarQube. Hands-on experience with Kubernetes and the ELK Stack . Strong teamwork and proactive approach to problem-solving. Excellent written and spoken English. This role is not perfectly suited for you, but you have a friend who would fit? Recommend your friend and get up to 5000 zł! Referral Program: Talent from your network Don't hesitate and apply now!

🏢 Summary: Fully remote Senior Java Backend Engineer role for Poland-based candidates, building high-performance, low-latency financial trading systems for a major North American bank. The position focuses on core Java development, distributed services, performance diagnosis, and long-term collaboration with capital-markets teams. 🗂️ Requirements: 6+ years of backend Java development experience, Current core Java programming expertise, Algorithms, complexity, and data structures knowledge, Java standard library data structures knowledge and internals, Distributed service-based applications with message queues experience, Production performance diagnosis and root-cause analysis skills, Strong analytical and problem-solving skills, Clear technical communication in English, Availability to work US Eastern business hours during the first two months, Polish residency and legal authorization to work in Poland, Successful background check 📃 Skills: Java, Algorithms, Complexity, DataStructures, DistributedSystems, MessageQueues, Debugging, Testing, PerformanceAnalysis, RootCauseAnalysis 🏢 Description: Join the Java Engineering Team at a top N. American Bank Are you a Java engineer who enjoys working on large scale and high performance software? Do you love working with smart people on meaningful technology? Want to work in capital markets on financial trading systems? If so, read on. The Role at a Glance Senior Java Backend Engineer Fully remote for a top N. American bank (for residents of Poland only) Openings on multiple teams in the capital markets division (prime brokerage, platform team) Part of the core team - this is not a legacy support role or an outsourced B team We’re hiring experienced backend engineers (6+ years) to join a major N. American bank — directly supporting the development of financial trading systems . This is not a legacy maintenance or support role — you’ll be part of the core product team , building highly-performant, low-latency systems used across the firm. Are you a passionate Java developer who thrives on solving complex problems in low-latency, high-throughput trading systems ? Join us and work on interesting financial system engineering problems. Why Join Us? Work on a large-scale, low-latency trading system processing millions of daily transactions. 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. Different teams have different working hour arrangements. For all roles, to ensure efficient onboarding, you’ll work in sync with the American team during US Eastern business hours for the first two months . Working this way maximizes your time overlap for answering questions, which means you can learn quickly. That means working until 21:00 CET. After that, some teams offer more flexibility your schedule can shift closer to standard Polish business hours. 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: Work on a trading system at an established financial institution, processing millions of transactions daily. 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: Above-average pay and ample time-off options. Responsibilities Design and implement robust software solutions for the bank’s trading systems using core Java (versions vary from team to team, and include 8, 17 and 21). Understand, develop, and improve the subsystems used by other teams in the trading platform. Create thorough test cases to ensure software stability and reliability. Collaborate with operations teams regarding building new features and improving existing functionality. Support production issues, including root-cause analysis and diagnosis. Requirements Must have Strong understanding of programming concepts, including algorithms, complexity, and data structures. Good knowledge of the data structures in the Java standard library - both breadth and internals. Experience building distributed service-based applications based on message queues. Strong analytical and problem-solving skills, to effectively diagnose production performance issues measured in microseconds. Open mind, curiosity, and a strong desire to learn new technologies and business domains. Ability to clearly explain non-trivial systems and algorithms. Ability to follow and understand technical conversations. Know when and how to ask questions that speed up learning. Ability to align your working schedule to US Eastern business hours. Nice to have Experience with financial markets and trading systems. Knowledge of AWS systems. Experience with Spring boot (some teams). Experience with JVM tuning (some teams). Experience working remotely with North American firms. 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 a three-stage interview process: Discuss your experience and skills. Solve verbal algorithm problems (focus on clarity and understanding). Tackle live coding challenges (no trick questions). No take-home assignments – we respect your time. Successful candidates will need to pass a standard background check.

🏢 Summary: Backend .NET role focused on building and evolving a scalable digital real estate platform for property investment, financing, ownership, and management. The position involves designing service-oriented backend systems, improving performance and reliability, and collaborating across engineering teams in an agile environment. Remote, office, and hybrid work options are available, with professional development, certification support, and health-related benefits. 🗂️ Requirements: 4+ years of .NET development experience, Docker and Kubernetes experience, Azure services experience: Key Vault, App Configuration, queues, Azure AD B2C, RESTful APIs, microservices, and serverless computing knowledge, SQL and NoSQL database design experience, Caching strategies experience, Codebase architecture, code organization, and design patterns expertise, English proficiency: Intermediate+ 📃 Skills: C#, .NET, Docker, Kubernetes, Azure, KeyVault, AppConfiguration, ADBC2, REST, Microservices, Serverless, SQL, NoSQL, Caching, Debugging, Testing, Observability 🏢 Description: Andersen is hiring a Backend Developer (.NET) for a project developing a digital real estate platform and delivering scalable solutions for property management and investment. The customer is a technology company developing digital solutions that modernize complex business processes and improve customer experiences. Its integrated platform brings together multiple digital services into a seamless online experience, helping users manage a wide range of activities more efficiently. By leveraging innovative technologies, automation, and strategic partnerships, the company drives digital transformation while enhancing efficiency, transparency, and accessibility. The project is focused on developing a digital real estate platform that simplifies property investment, financing, and ownership. It combines fractional ownership, mortgage services, and property management capabilities into a single solution, making real estate more accessible and easier to manage throughout the entire ownership journey. Responsibilities: Designing and developing high-performance, scalable backend systems using C# and .NET technologies. Leading the design discussions and implementing best practices for service-oriented architectures and microservices. Driving the evolution of our existing platform to the next level by leveraging cutting-edge technologies and strategies to ensure a future-proof and scalable infrastructure. Ensuring high quality unit/integration tests where required. Identifying, troubleshooting, and resolving complex technical issues, with a strong emphasis on debugging skills. Optimizing system performance through proactive analysis, code reviews, and continuous improvement initiatives along with observability tooling. Mentoring junior engineers and sharing your deep technical expertise across teams. Collaborating with cross-functional teams including frontend developers, DevOps, QA, and product managers to deliver high-quality solutions. Contributing to agile processes and driving continuous improvement in development methodologies and practices. Staying updated with emerging technologies and industry trends, recommending new tools and practices to enhance the technical stack. Contributing to the technical strategy and roadmap of backend services. Must-haves: Experience with .NET development for 4+ years. Experience with containerization technologies such as Docker and orchestration platforms like Kubernetes. Experience with Azure cloud services like key vault, app config, various queueing products and ADB2C. Familiarity with RESTful APIs, microservices architecture, and serverless computing. Extensive database design experience with SQL and NoSQL. Extensive caching strategies and related experience. Command over codebase architecture and code organization with relevant design patterns. Level of English – from Intermediate+ and above. Nice-to-haves: Previously worked in a fintech/proptech industry. Knowledge of additional programming languages or frameworks is a plus. Certification(s) related to Azure or cloud technologies. Programming experience in a related language such as Golang, Typescript, etc AWS cloud native experience. 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. Private health insurance and sports compensation, depending on the type of employment. Join us! Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy/pl

🏢 Summary: Backend Developer (.NET) role focused on building secure, scalable backend services, APIs, integrations, and digital portals for an insurance platform. The position includes authentication and authorization management, Azure API Management, OutSystems support, and production troubleshooting in a cross-functional team. 🗂️ Requirements: 4+ years of commercial .NET and C# development experience, REST API and backend-service development and integration experience, Hands-on Auth0 configuration and support experience, Authentication and authorization knowledge: OAuth 2.0, OpenID Connect, JWT, roles, permissions, Microsoft Azure experience, Azure API Management experience: routing, policies, authentication, integrations, Internal-system and third-party-service integration experience, Upper-Intermediate English or higher 📃 Skills: .NET, C#, REST, Auth0, OAuth, OpenID, JWT, Azure, OutSystems, Okta 🏢 Description: Andersen is hiring a Backend Developer (.NET) for a project developing scalable digital insurance platforms and delivering secure backend services and system integrations. The customer is an international insurance company operating across multiple countries, known for expertise in niche markets and commitment to high-quality service. With strong governance and transparent practices, it promotes a culture of innovation, diversity, and continuous learning. Recent achievements, including record financial results and recognition for customer service, highlight its resilience and long-term value creation. The project is focused on developing and enhancing customer- and agent-facing digital portals using .NET, OutSystems, and Azure technologies. It includes backend services, system integrations, API management, and secure authentication to deliver reliable and scalable digital experiences. Responsibilities: Developing, maintaining, and enhancing backend services and APIs using .NET. Configuring and supporting authentication and authorization flows using Auth0 and Okta. Maintaining Auth0 applications, APIs, connections, roles, permissions, rules, actions, and identity-provider integrations. Developing and supporting customer- and agent-facing functionality built with OutSystems. Configuring and maintaining API routing and policies in Azure API Management. Integrating portal applications with internal core systems and external services. Troubleshooting authentication, integration, API, and application issues across the technology stack. Collaborating with business analysts, architects, QA engineers, and other developers to translate business requirements into technical solutions. Participating in technical design discussions, code reviews, testing, deployment, and production support. Ensuring that solutions follow security, scalability, maintainability, and performance best practices. Contributing to improving development standards, documentation, and engineering processes. Must-haves: Strong commercial software development experience with .NET and C# for 4+ years. Experience developing and integrating REST APIs and backend services. Hands-on experience configuring and supporting Auth0. Good understanding of authentication and authorization concepts, including OAuth 2.0, OpenID Connect, JWT, roles, and permissions. Experience working with Microsoft Azure services. Practical knowledge of Azure API Management, including API routing, policies, authentication, and integrations. Experience integrating applications with internal systems and third-party services. Strong troubleshooting and problem-solving skills. Ability to work across different parts of the application stack. Good communication skills and the ability to collaborate with both technical and non-technical stakeholders. Level of English – from Upper-Intermediate and above. Nice-to-haves: Commercial experience developing applications with OutSystems; or a strong interest in learning OutSystems and willingness to work with it as a core part of the project. Experience with low-code application development platforms will be considered an advantage. Experience with Okta administration or integration. Experience with Azure Functions, App Services, Application Insights, or other Azure services. Knowledge of CI/CD pipelines and automated deployment processes. Experience working with customer-facing or agent-facing portals. Experience in the insurance or financial-services domain. Understanding of secure software development practices. Experience supporting production applications and investigating incidents. 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. Private health insurance and sports compensation, depending on the type of employment. Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy/pl Join us!