Senior Software Engineer C# / .NET (m/w/d)

About this role

For our client, a global leader in metrology and process control for semiconductor manufacturing, we are looking for a Senior Software Engineer C# / .NET (m/w/d) for a permanent position.

The team is based in Mannheim and has more than 25 years of experience building high-precision measurement systems. Their software looks down to the atomic level and turns what it sees into actionable data for the production of the world’s most advanced computer chips.

In this role you will design, build and maintain distributed software where performance, concurrency and reliability matter. You will also help shape how the team builds that software.

At a glance

Start: ASAP or by agreement

Contract: Contract, full-time

Setup: Hybrid, 3 days remote and 2 days on-site in Mannheim

Working language: English (German is a plus)

Your tasks

Design, develop, test and maintain scalable applications in C# and the .NET ecosystem

Write clean, well-documented code following Clean Architecture and the team’s coding standards

Work test-driven (TDD) and strengthen a culture of automated testing

Build robust multi-threaded solutions using locking, interlocking and parallelism in .NET

Turn business requirements into technical solutions together with product owners, architects and cross-functional teams

Review code and give constructive feedback to keep quality and consistency high

Mentor junior and mid-level developers and provide technical guidance

Identify and drive improvements in architecture, performance, reliability and maintainability

Troubleshoot and resolve complex issues across a distributed software stack

Contribute to CI/CD and modern delivery practices

Your profile

Must have

Deep, hands-on knowledge of C# 14 and modern .NET

Several years of experience with multi-threaded programming

Several years of experience with high-volume in-memory data processing

Solid experience designing and implementing RESTful APIs

Strong command of OOP, SOLID, Clean Code, multi-layer architecture and TDD

Practical experience with automated testing : unit tests, component tests, mocking

Good working knowledge of UML

Proven experience in hardware-related software development

Degree in Computer Science, Software Engineering, Physics or a related field

Excellent English; you work well in international, cross-functional teams

Nice to have

Real-time systems, hardware integration or optical sensor data processing (strong plus)

Legacy modernization, such as migrating a monolith to distributed, service-oriented systems or microservices

Distributed system design: event-based and object-based architecture, fault detection, causality methods, fault tolerance

Relational database design

Front-end development with .NET MAUI

German language skills

What we offer

A contract position at a global technology leader in a growing industry

Technically demanding work at the intersection of software, hardware and physics

A hybrid setup with 3 days remote per week

An international team that values clean engineering and code quality

Real influence on architecture, and the chance to mentor other developers

Personal support from us throughout the hiring process

Interested?

Send us your CV with your salary expectations and notice period . Unsure whether you meet every requirement? Apply anyway. We’d rather talk to you than miss a good match.

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