C Firmware for 3.5 kW Inverter

I’m wrapping up the hardware side of a 3.5 kW single-phase on-grid inverter I’m building for my own use and now need well-structured C firmware to bring it to life. The goal is solid, standards-minded... (Budget: ₹12500 - ₹37500 INR, Jobs: C Programming, C++ Programming, Digital Signal Processing, Electrical Engineering, Electronics, Embedded Systems, Firmware Development, Microcontroller)