everii Group

Senior Developer – .NET, C#

everii Group

full-time

Posted on:

Location Type: Hybrid

Location: Hamburg • Germany

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Job Level

Senior

Tech Stack

ASP.NETDockerEntity FrameworkGrafanaGraphQLLinux.NETPostgresSQL

About the role

  • Service development: Implementation and maintenance of cross-product core services for all everii products – e.g., OCR services for invoice processing from PDFs using AI, eInvoice services for electronic invoicing in various countries, and other product-related services.
  • Service encapsulation: Extracting functionality from individual products and providing it as standalone, reusable services.
  • AI & Innovation: Active use of AI tools and agents to support development processes.
  • Quality & Testing: Automated tests, code reviews and continuous improvement of code quality and developer experience.
  • APIs & Integrations: Development and enhancement of REST and GraphQL APIs, including authentication (OAuth, JWT) and documentation (Swagger/OpenAPI).
  • Operations & Monitoring: Responsibility for stable and secure services including monitoring (Grafana, Victoria Logs & Metrics) and troubleshooting across our CI/CD pipelines (GitHub Actions, Docker).
  • Technical concepts: Creating and implementing technical concepts as well as actively discussing architecture and solution approaches within the team.
  • Collaboration: Close collaboration within the development team and technical exchange on architecture and solution approaches.

Requirements

  • Solid backend experience with ASP.NET Core (including Entity Framework Core, Hangfire) – you know the .NET ecosystem and write C# with conviction.
  • Confident use of Git and 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.
  • Comfortable and confident using 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.
  • Ideally you have already contributed to a production-deployed SaaS product.
  • Clear communication skills, giving and receiving feedback, and conducting constructive discussions.
Benefits
  • Individual development: Room for autonomous work, scope 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 weekly shared breakfasts – 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 role, start possible immediately.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
ASP.NET CoreC#Entity Framework CoreHangfireREST APIsGraphQL APIsOAuthJWTPostgreSQLMS SQL
Soft Skills
clear communicationgiving feedbackreceiving feedbackconducting discussionscollaboration