Backend Developer (.NET) in the EU

Responsibilities:

• Designing and building .NET 8 microservices — FastEndpoints, clean architecture (Domain / Application / Infrastructure / API layers). 
• Implementing Temporal workflow orchestration — typed workflow and activity interfaces, cross-task-queue dispatch, signal/query patterns. 
• Building rules evaluation integrations with GoRules ZEN engine (GoRules.Zen NuGet, Rust FFI in-process). 
• Developing platform capabilities — config registry, rules API, workflow gateway, payment and policy adapters. 
• Implementing cross-cutting concerns — Managed Identity service-to-service auth, Cerbos authorization integration, structured logging via Serilog/Anotar. 
• Writing and maintaining xUnit tests — FakeItEasy for mocking, Shouldly for assertions; integration tests against real dependencies (no mock DB). 
• Collaborating with platform and domain teams on API contracts, OpenAPI specs, and shared NuGet libraries.

Must-haves: 

• Hands-on .NET (v6+) development experience, with .NET 8 required, for 3+ years.
• Strong understanding of Clean Architecture principles, including strict layer dependency rules, separation of business logic from the API layer, and Result-based error handling instead of exceptions for business errors. 
• Hands-on experience with ITemporalClient, IWorkflow, IActivity, task queue registration, and cross-task-queue dispatch. 
• Strong experience with Azure services, including Key Vault, Managed Identity, Blob Storage, and Application Insights. 
• Experience with structured error-handling patterns; familiarity with Result/Maybe patterns preferred.
• Strong experience with Entity Framework Core or equivalent ORM technologies, including migrations, value objects, and aggregate roots. 
• Hands-on experience with automated testing using xUnit, FakeItEasy, and Shouldly, including integration testing patterns. 
• Strong hands-on experience with containerized local development using Docker, Podman, or equivalent technologies.
• Good understanding of Dockerfiles and multi-stage builds.
• Experience running and troubleshooting a complete local development stack with Podman Compose, including application services, Temporal, and databases.