Senior .NET Backend Engineer — Remote/Hybrid, Microservices

DOU Polska; Województwo mazowieckie; Remote; PLN 264,000 - 441,000; Full time

Benefits offered by this job

Remote or hybrid work

Private health insurance

Sports compensation

Training portal access

Mentoring and adaptation program

Annual bonus up to 1000 EUR

Job summary

Andersen is hiring a Senior Backend Developer (.NET) for a EU-based project to build a modern digital insurance platform with secure, scalable APIs and seamless system integrations.

You will design .NET 8 microservices, implement Temporal workflows, integrate GoRules Zen, and collaborate on API contracts, tests, and cloud deployments. Remote or hybrid work options are supported. The role requires strong C#, EF Core, Docker, Azure, and clean architecture expertise, with intermediate+ English.

Qualifications

• 5+ years of commercial experience with C# / .NET
• Hands-on experience with .NET 8
• Experience with Temporal workflow orchestration
• Experience designing and developing microservices
• Strong understanding of Clean Architecture, SOLID principles, and layered architecture
• Knowledge of distributed systems and asynchronous processing
• Experience with Azure and EF Core
• Experience writing unit and integration tests
• Experience with Docker and containerized development
• Ability to learn new technologies quickly
• Intermediate+ English

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

Skills

C# / .NET

.NET 8

Temporal workflows

Microservices design

Azure

Entity Framework Core

Docker and containers

English (Intermediate+)

Tools

Azure

Docker

EF Core

GoRules Zen

Job description

Andersen is hiring a Senior Backend Developer (.NET) for a EU-based project to build a modern digital insurance platform with secure, scalable APIs and seamless system integrations.

You will design .NET 8 microservices, implement Temporal workflows, integrate GoRules Zen, and collaborate on API contracts, tests, and cloud deployments. Remote or hybrid work options are supported. The role requires strong C#, EF Core, Docker, Azure, and clean architecture expertise, with intermediate+ English.