Senior Developer - .NET / C# (m/w/d)| Hamburg oder Frankfurt

We are looking for a Senior Developer to work on central, product-spanning core services of the everii Group. The role involves developing and maintaining services that are used by multiple products and form a stable technical foundation for our platform. The focus is on extracting existing functionality from individual products, providing them as independent services, and reliably further developing them - always with a view to performance, stability, and maintainability.

Requirements

• Solid backend experience in ASP.NET Core (including Entity Framework Core, Hangfire)
• Safe handling of Git as well as IDEs such as Visual Studio, VS Code or JetBrains Rider
• Knowledge of 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 (.NET)
• Knowledge of performance optimization and caching strategies
• Open and safe handling of AI tools and agents
• Routine with automated testing as well as GitHub Actions, Docker, and container-based deployment
• Basic knowledge of working with Linux servers and container-based setups
• SaaS experience

Benefits

• Individual development: Space for autonomous work, design freedom, and continuous learning.
• Smart work: Modern technical equipment, hybrid working model, and trust-based working hours.
• Feel-good atmosphere: Fresh fruit, coffee, chilled drinks, and weekly team breakfast - right in the heart of Hamburg or Frankfurt.
• Tech stack & team: Modern tools and technologies in a product-related team with short decision-making paths.
• Stability: Unrestricted permanent position in full-time, start possible immediately.