As a Senior Developer, you work on core, cross-product services for the everii Group.
In close collaboration with other developers, you design, develop and maintain services that are used by multiple products.
You create technical concepts, implement them and actively contribute to the further development of our system landscape.
Your primary focus is on .NET/C#.
Service development: implementing and maintaining cross-product core services used by all everii products.
Service encapsulation: extracting functionality from individual products and providing it as standalone, reusable services.
Active use of AI tools and agents to support development processes.
Responsibility for stable and secure services, including monitoring and troubleshooting across our CI/CD pipelines.
Creating and implementing technical concepts and actively discussing architectural and solution approaches within the team.
Close collaboration within the development team and technical exchange on architecture and solution approaches.

Solid backend experience with ASP.NET Core (including Entity Framework Core, Hangfire) — you are familiar with the .NET ecosystem and write C# with confidence.
Proficient with Git and IDEs such as Visual Studio, VS Code or JetBrains Rider.
Experience with PostgreSQL, MS SQL or other relational databases.
Experience with REST and GraphQL APIs as well as API authentication (OAuth, JWT) and documentation (Swagger/OpenAPI).
Experience with Hangfire (for .NET).
Knowledge of performance optimization and caching strategies.
Open and confident handling of AI tools and agents — AI is one of your key aids in development.
Routine in automated testing as well as with GitHub Actions, Docker and container-based deployment.
Basic knowledge of working with Linux servers and containerized setups.
Ideally, you have already contributed to a production SaaS product.

Individual development: room for autonomous work, freedom to shape your role and continuous learning.
Smart work: modern technical equipment, a hybrid working model and trust-based working hours.
Feel-good atmosphere: fresh fruit, coffee, chilled drinks and a weekly communal breakfast — located in the heart of Hamburg or Frankfurt.
Tech stack & team: modern tools and technologies in a product-focused team with short decision-making paths.
Stability: permanent full-time position, start possible immediately.

Senior Developer – .NET, C#

Key skills