Senior .NET Developer

• 6+ years of experience in backend development using .NET / .NET Core
• Hands-on experience building large-scale web-based systems
• Solid understanding of microservices architecture
• Good knowledge of relational databases
• Analytical mindset with strong problem-solving skills
• Ability to work independently while being a reliable teammate
• Continuous learning approach and adaptability to new technologies
• Good written and verbal English communication skills

Nice to have:

• Experience with Docker and Kubernetes
• Familiarity with TDD and automated testing approaches
• Understanding of event-driven architecture (Kafka, pub/sub patterns)

• Designing and developing scalable microservices from the ground up
• Implementing according to architectural and product design documents
• Reverse engineering of current business logic modules
• Modernizing legacy components to meet new business requirements
• Writing clean, maintainable code with a strong focus on quality and testability (TDD)
• Participating in code reviews and driving engineering guidelines
• Collaborating closely with cross-functional teams across product, QA, and DevOps
• Building and maintaining the team's AI tooling — reusable skills, custom agents, MCP servers, and repo instruction files

This role follows a hybrid working model and requires onsite attendance at the Kraków/Warsaw office three days per week.