Senior .NET Backend Engineer: API & Microservices

Next Learning Valley; Utrecht; Hybrid; EUR 70,000 - 100,000; Full time

Job summary

Next Learning Valley is seeking a hands-on Senior .NET Backend Engineer to design, build and operate robust backend services and modular applications. You will focus on production-ready APIs, background services and clean architecture with strong ownership.

You’ll design APIs, work with Postgres, Docker, CI/CD, and cloud services like Azure, while collaborating across backend, frontend and platform teams to deliver scalable solutions.

Qualifications

• Proficient in C# with experience building production APIs.
• Solid REST and OpenAPI design and implementation experience.
• Hands-on with Docker, Git and CI/CD pipelines; microservice/multimodule architectures.

Responsibilities

• Design, build and maintain APIs using .NET and ASP.NET Core.
• Develop clean, maintainable C# code and apply async patterns.
• Design REST and OpenAPI contracts and support modular architectures.
• Troubleshoot production issues and ensure secure, production-ready solutions.
• Design PostgreSQL schemas and migrations; optimize SQL performance.
• Work with Kafka or Azure Service Bus for integrations; support CDC/streaming.

Skills

Advanced C#

REST & OpenAPI

Microservices

Modular Monolith

Git

CI/CD

Strong analytical skills

Tools

Docker

Azure Service Bus

Kafka

Prometheus

Grafana

Job description

Next Learning Valley is seeking a hands-on Senior .NET Backend Engineer to design, build and operate robust backend services and modular applications. You will focus on production-ready APIs, background services and clean architecture with strong ownership.

You’ll design APIs, work with Postgres, Docker, CI/CD, and cloud services like Azure, while collaborating across backend, frontend and platform teams to deliver scalable solutions.