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# Senior Backend Developer (.NET) in the EU

- **Company:** Andersen Software
- **Location:** Austria (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, Multitier Architecture, Application Programming Interfaces (APIs), Application Performance Management, Microsoft Azure, C Sharp (Programming Language), Distributed Systems, Entity Framework, Windows Communication Foundation, Key Management, NuGet, Mockito, Simple Object Access Protocol (SOAP), Systems Integration, Workflow Management Systems, Openapi, Data Logging, Concurrency, Backend, Xunit, Event Driven Architecture, Integration Tests, Solid Principles, Apache Kafka, Api Management, Docker, Microservices
- **Published:** October 21, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=e752d1825b88cb48

## About the Role

* Commercial experience with C# / .NET for 5+ years.
 * Strong hands-on experience with .NET 8.
 * Experience designing and developing microservices.
 * Strong understanding of Clean Architecture, SOLID principles, and layered architecture.
 * Strong understanding of distributed systems and asynchronous processing.
 * Experience with system design, transactions, concurrency, idempotency, and error handling.
 * Strong hands-on experience with Azure.
 * Strong experience with Entity Framework Core.
 * Experience writing unit and integration tests.
 * Experience with Docker and containerized development.
 * Ability to independently and quickly learn new technologies and libraries.
 * Willingness to study project-specific libraries before the technical interview.
 * Level of English - Intermediate+ and above.

Desired skills

 * Experience with Temporal workflow orchestration and Temporal .NET SDK.
 * Experience with FastEndpoints.
 * Experience with GoRules ZEN, JDM, and ZEN expressions.
 * Experience with Cerbos.
 * Experience with JSONata .NET.
 * Experience with Azure Key Vault, Managed Identity, Blob Storage, and Application Insights.
 * Experience with xUnit, FakeItEasy, and Shouldly.
 * Experience with Podman / Podman Compose.
 * Experience with ASP.NET Core Minimal APIs.
 * Experience with Kafka and event-driven architecture.
 * Experience with SOAP/WCF integrations.
 * Experience with Result/Maybe patterns.

## Description

* 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.