Arduino ESP8266 NodeMCU coding

I need an Arduino C coder to fix some bugs in a pretty advanced script running on an ESP8266 chip.

You need to be very experienced with C on Arduino.
You need to know regular expressions very well.
You need to have experience coding for Arduino.

The script does a whole bunch of work with arrays, caching, parsing strings etc.

I realise it takes some time to get familiar with existing code (re-write is not an option). So I am happy to pay for some (limited) hours to get familiar with the code. But you need to have the right skills and experience to start with. I will be asking you to provide time estimates once you understand the code so that we can budget properly.

Initially a small project to fix some bugs. Could lead to more work if it goes well.