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