Implement and unit test C++ module

I am looking for a skilled C++ developer to implement and unit test a finite state machine module that will manage a water tank level state. I have specific requirements for the programming style and code structure, so attention to detail is crucial. The module needs to be built using Platformio for Native environment. Ideal skills and experience for this job include:
- Strong proficiency in C++ programming
- Experience with finite state machines
- Familiarity with State pattern
- Familiarity with Linux and GCC compiler
- Attention to detail and ability to follow specific requirements for programming style and code structure.