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🏢 Summary: Hybrid .NET Developer role supporting the development and improvement of a large-scale core banking platform. The position focuses on delivering new features, improving performance and reliability, building automated tests, and collaborating with analysts and business stakeholders. 🗂️ Requirements: C# and .NET/.NET Core knowledge, MS SQL and PostgreSQL experience, Object-oriented programming and design-patterns knowledge, Docker and Kubernetes experience, Automated-testing knowledge, Teamwork and communication skills, Ability to work with technical documentation in English, Knowledge of software-development best practices, including SOLID 📃 Skills: C#, .NET, .NETCore, MSSQL, PostgreSQL, Docker, Kubernetes, OOP, SOLID 🏢 Description: Ignite the future of digital banking — develop innovative solutions that transform financial services! Warsaw-based opportunity with hybrid work model (2 days in the office/month). As a .NET Developer you will be working for our client, one of the leaders in the online banking sector that develops and maintains large-scale financial systems supporting daily operations of digital banking services. In this role you will contribute to the development and improvement of a core banking platform used across the organization. You will work closely with analysts, developers, and business stakeholders to implement new functionalities, improve system performance, and ensure the reliability and quality of software solutions in a modern .NET environment. Your main responsibilities: Implement new functionalities and system improvements in applications developed in the .NET environment Participate in development work within projects related to the core banking system Develop and maintain automated tests to ensure high quality of delivered solutions Collaborate with analysts and business users to support requirements analysis and clarification Participate in internal software testing and verification processes Create and update technical and functional documentation for developed solutions Support the development team in maintaining system stability and performance You're ideal for this role if you have: Good knowledge of C#, .NET, .NET Core Experience with MS SQL and PosgreSQL Understanding of object-oriented programming principles and design patterns Hands on experience with Docker and Kubernetes Knowledge of automated testing techniques Ability to work effectively in a team environment Strong communication skills and attention to detail Good organizational skills and ability to quickly learn new technologies Ability to work with technical documentation in English Familiarity with software development best practices (e.g. SOLID) Nice to have: Knowledge of Agile methodology

🏢 Summary: Hybrid .NET Developer role supporting a digital banking modernization program, rebuilding legacy BPM applications into scalable modern .NET solutions. The position combines backend development, automated testing, enterprise integrations, Kubernetes deployment support, and AI-assisted development with Claude and Codex. 🗂️ Requirements: 3+ years of C# and .NET development experience, Experience with .NET Framework and legacy-code modernization, Practical experience with Claude and Codex, Strong automated-testing experience, Enterprise application design and implementation experience, Strong MS SQL knowledge, Experience with Git, JIRA and TeamCity, English proficiency for technical documentation 📃 Skills: C#, .NET, .NETFramework, Claude, Codex, MS SQL, Git, JIRA, TeamCity, LLM, Testing 🏢 Description: Unleash innovative web solutions — shape the future of digital banking experiences! Łódź-based opportunity with hybrid work model (2 days in the office/month). As a .NET Developer you will be working for our client, a leading financial institution focused on delivering innovative digital banking solutions. You will join a strategic modernization initiative involving the redevelopment of a BPM platform. The project focuses on rebuilding legacy applications from .NET Framework to modern .NET technologies. You will collaborate closely with AI-powered development tools and help deliver scalable, secure, and maintainable solutions in a complex enterprise environment. Your main responsibilities: Develop and maintain backend services using .NET and C# Rebuild legacy applications from .NET Framework to modern .NET architecture Create and maintain automated tests Collaborate with business stakeholders to analyze and refine requirements Design scalable and maintainable software solutions Integrate applications with databases and external services Utilize LLM-based tools such as Claude and Codex to support software development activities Participate in code reviews and ensure adherence to development standards Deploy and support applications running in Kubernetes environments Work closely with cross-functional teams in an Agile delivery model You're ideal for this role if you have: At least 3 years of experience in software development using C# and .NET Experience with .NET Framework and modernizing legacy code Practical experience working with LLM tools such as Claude and Codex Strong experience with automated testing Experience designing and implementing enterprise applications Strong knowledge of MS SQL Experience using Git, JIRA, and TeamCity Ability to work independently while collaborating effectively within a team English skills sufficient to write and understand technical documentation Nice to have: Knowledge of Docker and Kubernetes

🏢 Summary: Remote Senior .NET Developer role focused on extending and scaling banking systems, integrating securities and banking operations, and supporting product control and risk management applications. The position requires full-stack .NET and Angular development, testing expertise, and experience with cloud-oriented system scaling. 🗂️ Requirements: 5+ years of .NET development experience, Angular proficiency, Full-stack development experience, Hands-on code testing experience, SOLID design principles, Document-based database experience, MongoDB familiarity, Unit and integration testing experience, Event-based messaging framework experience, Banking industry experience 📃 Skills: .NET, Angular, SOLID, MongoDB, Testing, Messaging, Banking 🏢 Description: Introduction & Summary: We are seeking a highly skilled Senior .NET Developer with a strong background in developing and extending systems for the banking industry. The ideal candidate will possess at least 7 years of experience in .NET development along with proficiency in front-end technologies, particularly Angular. This is a 100% remote position requiring a proactive approach towards scaling applications and supporting cloud-based solutions. Main Responsibilities: Develop and extend systems to support additional entities. Merge securities and banking operations seamlessly. Provide support for 17 applications including product control and risk management. Utilize in-house development frameworks. Scale systems for cloud-based operations to onboard new entities. Key Requirements: 5+ years of experience in .NET development. Proficiency in front-end technologies, specifically Angular. Full-stack development experience with hands-on code testing. Solid understanding of SOLID design principles. Experience with document-based databases. Familiarity with MongoDB. Integrated experience with unit and integration testing. Experience with event-based messaging frameworks. Background in the banking industry. Nice to Have: Advanced cloud computing skills. Experience with containerized solutions.

🏢 Summary: Remote, long-term B2B contract for an experienced .NET Software Developer supporting a European Union organization. The role covers enterprise-system design and development, technical leadership, solution architecture, quality optimization, releases, testing, and 2nd/3rd-line support. Rate: 215 PLN net + VAT per hour. 🗂️ Requirements: Completed at least one full solution lifecycle, Expertise in enterprise-level software development, UML application design, Data, business-logic and UI-layer design and development, Scrum experience, Technical team leadership capability, Technical-solution documentation skills, Problem-solving skills, At least 2 years of experience with mission-critical complex enterprise systems, Experience with asset and/or human-resources management and financial-management systems, At least one internationally recognized intermediate software-development certification relevant to the domain 📃 Skills: .NET, UML, Scrum, Enterprise, Testing, Prototyping, Configuration, Deployment 🏢 Description: Currently, for one of our Partners, we are looking for an experienced Software Developer .NET (m/f/n) to support a long‑term project delivered for an organization of the European Union based in Warsaw. Requirements: Has gone at least 1 time through the complete lifecycle of the solution Expert in developing enterprise level software systems in specified technology domain Knows UML and can design applications in UML Proficient in designing and developing: data layer, business logic layer and UI layer Worked in Scrum developments Is capable for leading technical teams Holds ability to document effectively technical solutions Presents problem solving skills Specific requirements At least 2 years of experience with mission critical complex enterprise systems including asset and/or human resources management, as well as financial management. At least 1 certification among: Intermediate level certificate in software development relevant to the domain or an equivalent certification recognized internationally (subject to acceptance as a valid credential by the Contracting Authority) Typical tasks and responsibilities Designs and develops the system Lead development teams Translates requirements into design Optimizes software from performance, security and quality points of view Produces technical documentation Estimates effort and time for development Sets software development standards Propose technical solutions for business needs and technical problems Collects and interprets software metrics Manages configuration and releases Contributes to requirements analysis, testing, quality assurance, change management, deployment Tests solutions and develops testing tools Documents developments Prototypes solutions Acts as 2nd and 3rd line support Offer: Rate: 215 PLN net +VAT/H Set-up: Remote B2B

🏢 Summary: Remote B2B opportunity for a .NET Software Developer to design, build, and optimize mission-critical enterprise systems for a major European institution. The role includes end-to-end development, technical leadership, solution design, testing, release management, and advanced technical support, with occasional visits to Warsaw. 🗂️ Requirements: 4+ years of IT-relevant professional experience, 2+ years of relevant project or similar-role experience, 2+ years working with mission-critical complex enterprise systems, Experience with asset or human-resources management and financial-management systems, Expertise in enterprise-level .NET software development, Data, business-logic, and UI layer design and development experience, UML application design experience, Completion of at least one full software-solution lifecycle, Scrum development experience, Technical team leadership experience, Fluent English at B2 level or higher, Bachelor’s degree or equivalent 3 years of higher education in an ICT-relevant field, Intermediate .NET software-development certification or an accepted equivalent international certification 📃 Skills: .NET, UML, Scrum, ICT 🏢 Description: Software Developer (.NET) — own system design, lead technical teams, and drive end-to-end development. Far-site remote, 200 PLN net/h B2B. IT · Multiple locations · Fully Remote About the Client and our Role At Optiveum, we connect top IT professionals with exciting tech initiatives. In this case, we are the recruitment partner acting within the TimeDev Framework Agreement to provide outsourcing consultants for our partner organization . By taking part in this long-term project, you will be contributing as a Software Developer to support a major European institution. The Role We are looking for a Software Developer (.NET) to take an active role in designing, building, and optimizing enterprise-level software systems. In this position, you will lead development initiatives, implement robust solutions across data, business logic, and UI layers, and ensure software meets stringent security, performance, and quality standards. You will work closely with other technical teams to prototype solutions and support complex enterprise frameworks. Responsibilities Design and develop the system, translating requirements into technical design. Lead development teams and set software development standards. Design applications using UML and optimize software for performance, security, and quality. Propose technical solutions for business needs and solve complex technical problems. Estimate effort and time for development. Produce technical documentation and effectively document developments. Manage configuration, releases, and collect/interpret software metrics. Contribute to requirements analysis, testing, quality assurance, change management, and deployment. Test solutions, develop testing tools, and prototype new features. Act as 2nd and 3rd line technical support. Expectations Experience: Minimum 4 years of overall IT-relevant professional experience, including at least 2 years of project experience relevant to the profile (or in a similar position). Specific Domain Expertise: At least 2 years of experience with mission-critical complex enterprise systems, specifically including asset and/or human resources management, as well as financial management. Technology Stack: Expert in developing enterprise-level software systems in the .NET technology domain . Technical Skills: Proficient in designing and developing the data layer, business logic layer, and UI layer. Strong knowledge of UML and ability to design applications in UML. Completion of at least 1 full lifecycle of a software solution. Process & Leadership: Experience working in Scrum developments, capable of leading technical teams, and strong problem-solving skills. Language: Fluent English (minimum B2 level / CEFR). Education (Level 6): Minimum Bachelor’s degree (or 3 years of higher education confirmed by a diploma). An ICT-relevant degree is mandatory. Certifications Requirements You must possess at least one of the following: An Intermediate level certificate in software development relevant to the domain (.NET). An equivalent internationally recognized certification (subject to acceptance as a valid credential by the Contracting Authority). What We Offer Salary: max 200 net / hour. Contract Type: B2B agreement. Type of Work: Remote with occassional visits to the client HQ in Warsaw, Poland

🏢 Summary: Senior .NET Developer role focused on transforming a data-intensive analytical platform for the cloud. The position involves scalable architecture design, legacy modernization, SOA-based development, user support, and close collaboration with engineering, analysis, and QA teams. 🗂️ Requirements: 5+ years of .NET software development experience, Web services design and implementation expertise, AWS and cloud environment experience, Redux and Context API mastery in React applications, Software design principles and best practices, Advanced English 📃 Skills: .NET, AWS, React, Redux, Context, SOA, Webservices 🏢 Description: We are looking for a Senior .NET Developer to join our team and contribute to the cloud transformation of a data-intensive analytical platform. In this role, you will collaborate with innovative and diverse professionals from around the world, designing scalable architectures and modernizing legacy components to ensure performance and reliability. Your tasks Contributing to the cloud transformation of a data-intensive analytical platform by designing scalable architectures and modernizing legacy components Ensuring continuous technological evolution of the product by proposing and implementing modern frameworks and architectural improvements Applying Service Oriented Architecture (SOA) concepts in software design and development Providing timely and courteous support to platform users, ensuring issues are understood, analyzed, and resolved promptly Collaborating closely with a team of software engineers, analysts, and quality engineers to design and build software solutions that meet business needs Adhering to team design and coding procedures and standards Requirements Minimum 5 years of experience in software development with a strong focus on .NET technologies Deep expertise in designing and implementing web services Practical experience with AWS and cloud environments Hands-on mastery of Redux and Context API in React applications Strong understanding of software design principles and best practices Advanced level of English Nice-to-have requirements Experience with C#

🏢 Summary: Długoterminowa współpraca dla doświadczonego .NET Developera przy utrzymaniu, rozwoju i wsparciu istniejących aplikacji biznesowych amerykańskiego klienta. Rola obejmuje rozwój API, pracę z bazami danych, optymalizację, wsparcie wdrożeń oraz codzienną współpracę z biznesem i zespołami technicznymi. 🗂️ Requirements: 3–5 lat komercyjnego doświadczenia w .NET, Bardzo dobra znajomość .NET Web, Doświadczenie z ASP.NET Web API, Zaawansowana znajomość SQL i SQL Server, Doświadczenie z PostgreSQL, Znajomość wzorców projektowych, Samodzielna analiza i rozwiązywanie problemów, Dbałość o szczegóły i jakość kodu, Bardzo dobra znajomość języka angielskiego, Gotowość do pracy w godzinach 18:30–05:00 ET, od poniedziałku do czwartku 📃 Skills: .NET, ASP.NET, WebAPI, SQL, SQLServer, PostgreSQL, DesignPatterns, C#, Kafka, Docker, GitHubActions, AWS, Lambda, CDK, Terraform, Microservices 🏢 Description: Poszukujemy doświadczonego .NET Developera do długoterminowej współpracy z amerykańskim klientem. Jest to rola związana głównie z utrzymaniem, rozwojem i wsparciem istniejących aplikacji biznesowych. Szukamy osoby, która czerpie satysfakcję z rozwiązywania rzeczywistych problemów biznesowych, dbania o jakość dostarczanych rozwiązań oraz współpracy z użytkownikami i interesariuszami. Zakres obowiązków Utrzymanie, rozwój i optymalizacja istniejących aplikacji webowych opartych o technologie .NET Analiza zgłaszanych problemów oraz ich skuteczne rozwiązywanie Projektowanie i implementacja nowych funkcjonalności zgodnie z wymaganiami biznesowymi Tworzenie oraz rozwój API w środowisku ASP.NET Web API Praca z bazami danych SQL Server oraz PostgreSQL Analiza i optymalizacja zapytań SQL Współpraca z klientem biznesowym oraz zespołami technicznymi Udział w przeglądach kodu i dbanie o wysoką jakość rozwiązań Wsparcie wdrożeń oraz utrzymanie stabilności środowisk produkcyjnych Identyfikowanie ryzyk i proponowanie działań minimalizujących wpływ zmian na systemy produkcyjne Must-have Minimum 3-5 lat doświadczenia komercyjnego w developmentcie .NET Gotowość do pracy w strefie czasowej USA, Godziny pracy: poniedziałek-czwartek, 18:30-05:00 ET Bardzo dobra znajomość .NET (Web) Doświadczenie z ASP.NET Web API Zaawansowana znajomość SQL oraz baz danych SQL Server Doświadczenie w pracy z PostgreSQL Znajomość wzorców projektowych (Design Patterns) Umiejętność samodzielnej analizy i rozwiązywania problemów Wysoka dbałość o szczegóły i jakość dostarczanego kodu Bardzo dobra znajomość języka angielskiego w mowie i piśmie (codzienna współpraca z klientem) Mile widziane Bardzo dobra znajomość C# Doświadczenie z Apache Kafka Doświadczenie z Dockerem Znajomość GitHub Actions Doświadczenie w środowisku AWS (Lambda, CDK) Znajomość Terraform Doświadczenie w pracy z architekturą opartą na usługach (microservices/event-driven)

🏢 Summary: Permanent .NET Developer role focused on building and maintaining desktop and business-critical applications in a mixed .NET and Java environment. The position covers development, integrations, troubleshooting, code reviews, documentation, and CI/CD support within international Agile teams. The offer includes hybrid work, flexible hours, private healthcare, insurance, training, and conference access. 🗂️ Requirements: Commercial .NET development experience, Proficiency in C#, Experience with Java-based applications or Java development, Desktop application development experience, Backend development and API-building experience, Knowledge of relational databases, Working knowledge of Git, Experience working in Agile/Scrum environments, English proficiency at B2 level or higher 📃 Skills: .NET, C#, Java, WPF, WinForms, REST, Git, SQL, CI/CD, Agile, Scrum 🏢 Description: For our client we are looking for a candidate for the position of .NET developer . In this role, you will be responsible for developing and maintaining desktop applications as well as business-critical systems in a mixed technology environment based on .NET and Java. Key responsibilities: Design, develop, and maintain desktop applications using .NET technologies Build and support business applications and system integrations within a .NET and Java ecosystem Analyze business and technical requirements, implementing new features and improvements Enhance and maintain existing applications and systems Identify, troubleshoot, and resolve technical issues Collaborate closely with distributed international teams Participate in code reviews to ensure code quality and best practices Prepare and maintain technical documentation Support deployment processes as well as CI/CD pipelines Requirements: Experience in .NET development Solid knowledge of C# Experience working with Java-based applications or Java development Hands-on experience in desktop application development (e.g., WPF, WinForms, or similar) Experience with backend development and building APIs Familiarity with relational databases Working knowledge of Git Experience in Agile/Scrum environments English proficiency at B2 level or higher Tech Stack: .NET Framework, .NET Core, .NET 5+, C#, Java, REST APIs, Git, MS SQL Server, SQLite, PostgreSQL, CI/CD Nice to have: Experience with WCF Knowledge of DevExpress Experience in enterprise environments or legacy system modernization Offer: Permanent employment contract Private medical care Group insurance Sports card Flexible working hours Hybrid work model (50% remote/ 50% office) Certified training programs and continuous professional development Access to e‑learning platforms Opportunities to attend IT conferences, including international events Language classes and online language learning tools

🏢 Summary: Long-term remote contract for an experienced .NET Developer to design, build, and improve business-critical enterprise applications for an international project. The role combines hands-on full-stack development, solution design, technical decision-making, and support for testing, releases, and deployments, with extension potential of up to four years. 🗂️ Requirements: 4+ years of professional software development experience, 2+ years of enterprise .NET development experience, Experience with complex, business-critical systems, Knowledge of layered architecture, Knowledge of UML, Full software development lifecycle experience, Scrum and Agile delivery familiarity, English proficiency at B2 level or higher, Relevant software development certification, ICT-related bachelor’s degree or equivalent 📃 Skills: .NET, UML, Scrum, Agile 🏢 Description: We are looking for experienced .NET Developers to build and enhance business-critical applications for a large international organisation. The role combines hands-on development with solution design and technical decision-making. Your responsibilities Design and develop enterprise applications using .NET Translate business needs into effective technical solutions Work across data, business logic and user interface layers Improve application performance, security and quality Support testing, releases and deployments Provide technical guidance and maintain documentation What we are looking for (must have): 4+ years of professional software development experience 2+ years in enterprise .NET development Experience with complex, business-critical systems, ideally in HR, finance or asset management Knowledge of layered architecture and UML Experience with the full software development lifecycle Familiarity with Scrum and Agile delivery English at B2 level or higher Relevant software development certification ICT-related bachelor’s degree or equivalent Offer Long-term contract with the possibility of extension for up to four years Stable international project Remote working model No security clearance required