Senior Software Engineer (.NET​/Embedded

We are seeking a Senior Software Engineer (.NET / Embedded) to work on the control software of a high-precision optical metrology tool used in semiconductor manufacturing.

• Design, develop, test, and maintain tool control software in C# and .NET
• Drive modularisation of a mature codebase without destabilising a production system
• Build robust concurrent code, including multi-threading, locking and interlocking, and parallelism in .NET
• Apply TDD and strengthen automated testing, including tests that touch real hardware
• Conduct code reviews
• Mentor and coach mid-level developers
• Troubleshoot complex issues across the software and hardware boundary

• Proficiency in C# and .NET with 3+ years of hands-on, senior-level experience on production systems
• Background in hardware-related development environments — code that has controlled, driven, or read from physical equipment
• Knowledge of object-oriented design, SOLID and design patterns, along with Clean Code principles
• Expertise in Test-Driven Development and ownership of automated test suites
• Skills in multi-threading, locking/interlocking, and parallelism in .NET
• Experience refactoring and modularising a long-lived legacy codebase
• Familiarity with mentoring and conducting code reviews
• English proficiency at B2 level or above
• Nice to have Understanding of real-time systems and deterministic timing
• Competency in hardware integration such as motion control, sensors and actuators, or device drivers and instrument interfaces
• Qualifications in optical sensor data processing, including spectroscopy, interferometry, or imaging and signal processing
• Domain background in semiconductor, metrology, test and measurement, or precision instrumentation, industrial automation, or medical devices
• German language skills