Backend Developer (.NET) in the EU

Andersen is a global software development company with over 18 years of experience supporting businesses worldwide in their digital transformation. Headquartered in Poland, with development centers across multiple countries, the company offers end-to-end IT services including custom software development, API integration, system architecture, legacy modernization, and long-term support. Andersen's expertise includes AI, Machine Learning, Data Science, Big Data, and Visual Technologies. The company has a portfolio of long-term partnerships with major industry leaders and operates with a team of 3,700+ experts delivering projects across industries such as Healthcare, FinTech, Logistics, Automotive, Manufacturing, E-commerce, Multimedia & Entertainment.

• Hands-on experience with .NET (version 6+) development, with .NET 8 required, for at least 3 years.
• Strong understanding of Clean Architecture principles, including strict layer dependency rules and separation of business logic from API layer.
• 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.
• Good understanding of Dockerfiles and multi-stage builds.
• Experience running and troubleshooting complete local development stack with Podman Compose, including application services, Temporal, and databases.

• Designing and building .NET 8 microservices with FastEndpoints and clean architecture (Domain / Application / Infrastructure / API layers).
• Implementing Temporal workflow orchestration including typed workflow/activity interfaces, cross-task-queue dispatch, and signal/query patterns.
• Building rules evaluation integrations with GoRules ZEN engine (GoRules.Zen NuGet, Rust FFI in-process).
• Developing platform capabilities such as config registry, rules API, workflow gateway, payment and policy adapters.
• Implementing cross-cutting concerns including Managed Identity service-to-service authentication, Cerbos authorization integration, and structured logging via Serilog/Anotar.
• Writing and maintaining xUnit tests using FakeItEasy for mocking and Shouldly for assertions; conducting integration tests against real dependencies.
• Collaborating with platform and domain teams on API contracts, OpenAPI specs, and shared NuGet libraries.