Senior .NET Backend Developer - 6+ months - remote

We are looking for a Senior .NET Backend Developer to support our client with the development of a Testsoftware Product.

Tasks:
* Further development of software used for testing hardware components
* Performance analysis & profiling of the software
* Runtime/bottleneck optimization
* Testing eg unit tests (building/extending tests, ensuring test quality).

Requirements:
* Senior .NET Back End developer (C#), at least 10 years continuously, truly strong in Back End development.
* Experience with .NET Framework 4.8 and up, multiple .NET/C# versions (evolution, differences, best practices over the years).
* Very strong skills in performance profiling/analysis and stability-focused engineering.
* Unit testing: very strong hands-on experience.

Project details:
* Start: 01.03.2026
* Workload: Fulltime
* Location: remote 90% - onsite 10%
* Duration: 6 months, with possible extension
* Language: English (communication & documentation)

Telephone interview slots with our client can be arranged at short notice with a decision immediately thereafter.
If you are interested in receiving further information about the role or can recommend a colleague or friend, please get in touch.