develop an embedded firmware

We need a firmware to run our system efficiently . PCB is designed by us and it uses GSM , SRAM and SD card for data storage, TCP-IP client server communication with our server, Data logger , sensor interfacing . We also have basic code with many bugs. PCB as well as firmware needs to be fixed as soon as possible. Please only bid if you are aware of these . More information will be provided by message to right person.