Middle .NET Backend Developer (German-speaking)
First seen by Alion on Nov 7, 2026.
About the Role
We are looking for a .NET Backend Developer to join our team!
We're building a large-scale, enterprise-grade web platform on a modular microservice architecture. As a backend engineer, you'll own the full lifecycle of domain services — from data modelling and business logic through API design, messaging contracts, database migrations, and production deployment.
You'll work in a multi-vendor setup alongside DevOps, architecture, and product teams.
Responsibilities:
Design, build, test, and operate microservices following a read/write service-pair pattern (read-only delivery APIs + write-capable update/ingestion services)
Implement event-driven communication between services
Own your domain end-to-end: schema design, API contracts, persistence, messaging, and production monitoring
Contribute to shared platform libraries and tooling
Document architectural decisions and service designs for both technical and non-technical stakeholders
Required Technical Skills and Experience
C# / .NET 8 / .NET Framework 4.7 – Web API development, modern C# features (records, pattern matching, nullable reference types, async/await best practices), experienced in both worlds
Entity Framework Core - code-first migrations, specification pattern, repository abstraction
Microservice architecture - clear separation of concerns across layered services (controller → service → repository)
Event-driven messaging - publishing and consuming messages on a service bus (MassTransit, NServiceBus, or similar), contract-first design, idempotency
Entity Framework Core - code-first migrations, specification pattern, repository abstraction
Authentication & Authorization - JWT validation, Azure AD / Entra ID, OIDC
Third-party API integrations (DAM systems, CRM/marketing platforms, email dispatch)
Nice to have:
Event-driven messaging - publishing and consuming messages on a service bus (MassTransit, NServiceBus, or similar), contract-first design, idempotency
Azure - AKS (Kubernetes), Azure SQL, Blob Storage, Table Storage, Key Vault, Managed Identity, Azure Functions (isolated worker model), Azure AI Search
Experience with CDN cache invalidation (e.g. Akamai FastPurge API)
Redis caching strategies
Roslyn Analyzers / Code Fix Providers
PDF generation libraries
Other Requirements
Fluent German skills strongly preferred
Experience working in a client-facing role, interacting with both technical and non-technical stake-holders
Experience working in agile, multi-vendor environments
Must be fluent in English, written and verbal communications