.Net Developer w Poznań, Polska

• Multi-year commercial experience with .NET (Framework and/or Core/5+)
• Strong knowledge of Entity Framework and relational databases (PostgreSQL)
• Hands-on experience with AWS in a production environment
• Proven ability to read, maintain, and safely refactor legacy code
• Practical understanding of architectural patterns (DDD, Clean Architecture) — applied in real systems, not just theory
• Comfortable working with REST APIs and API documentation standards (OpenAPI/Swagger)
• Strong ownership mindset, able to take architectural decisions, not just execute tasks
• Pragmatic approach to technical debt and legacy systems
• Good communication skills, comfortable working in a small team without rigid process overhead
• Knowledge of Go (Golang) is a plus

We're looking for a Senior .NET Developer to join our backend team working on roboticket, a multi-tenant SaaS ticketing platform used by sports clubs and event organizers across multiple countries. This is a senior-level environment: you'll work alongside experienced developers, take real ownership of technical decisions, and have a direct say in how the system evolves.

The role combines three things: evolving and modernizing our existing codebase, maintaining a live production system, and building new features on top of it. You'll be working with an established system with room for architectural improvement, helping guide its transition toward newer technologies including Go. At the same time, the platform keeps growing, so you'll also be designing and shipping new functionality, not just improving what's there.

If you enjoy having real architectural input, working on a system with meaningful complexity, and balancing stability, improvement, and new development — this role is for you.

,[Develop and maintain backend services in .NET Framework 4.8, working within an existing production system, Contribute directly to architectural decisions and help shape the migration strategy toward newer technologies (.NET Core/5+ and Go), Design, build, and maintain REST APIs used across a multi-tenant SaaS platform, Work with PostgreSQL, Redis, and S3 as part of day-to-day backend development, Integrate with and support services running on AWS (EC2, RDS Aurora, Lambda, ALB, SQS/SNS, CloudFront), Read, understand, and safely refactor legacy code as part of ongoing modernization efforts, Help improve test coverage and overall code quality across the backend, Support the transition toward full OpenAPI 3 (Swagger) documentation for existing and new APIs, Collaborate closely with a small backend team (5 developers), contributing to technical direction without heavy process overhead] Requirements: .NET, Entity Framework, PostgreSQL, REST API, AWS, AWS RDS, AWS EC, AWS S3, Redis, Go, Open API Tools: GitHub, GIT. Additionally: Sport subscription, Flat structure, Lunch card, Small teams, International projects, Free coffee, Bike parking, Shower, Free lunch, Free parking, Modern office, Startup atmosphere, No dress code.