At Madiff, we connect top IT talent with cutting-edge companies through remote Agile teams and nearshore outsourcing. With operations in Poland, Portugal, France, and the UK, we specialize in AI, DevOps, and Cybersecurity – supporting industries like Telecom, Banking, and Hi-Tech.Are you a passionate .NET Developer ready to contribute to the next-generation banking systems?We’re looking for a skilled engineer to join a major strategic digital transformation initiative – building a new Corporate Banking System from scratch, designed to integrate with over 30 internal systems across risk, credit, payments, and compliance.Key responsibilities: Develop scalable backend features using .NET 6/8 Design and implement REST and SOAP services Participate in architecture refinement and system design Collaborate closely with analysts and product teams on functional and technical requirements Conduct code reviews and write unit tests (xUnit) to ensure application quality Integrate Kafka for asynchronous communication and event streaming Maintain and improve application security, performance, and scalability

Create and update technical documentation

What we are looking for: Minimum 5 years of experience in .NET development Proficiency in C#, .NET 6/8, Entity Framework, and SQL Server Strong experience in building REST/SOAP APIs Familiarity with microservices architecture and distributed systems Experience with Kafka Fluent Polish and English Nice to have: Background in banking or fintech projects Knowledge of Domain-Driven Design and secure systems Understanding of CI/CD practices and Agile workflows Frontend experience with JavaScript/TypeScript (React) What we offer: Hybrid work model – 1 day per week in the client's office (Warsaw or Gdańsk) Opportunity to work on greenfield enterprise-level solutions Collaborative and multicultural international environment Comprehensive medical care