I will mixing and mastering song audio music producer

Mixing:

Pitch corrections (right amount of Auto-tune effect plugin if compulsory)

Equalizer (EQ)

Compressor

De-Esser ( reductions of sibilance sounds )

Multi-band compression

Stereo panning

Level balancing

Automation (in terms of volume, effects sends, etc.)

Audio repair

Reverb, Delay and other effects

Mastering:

Dynamic EQ (if compulsory )

Multi-band compression (if compulsory)

Saturation (if compulsory)

Stereo widening a mix with MS Processing (if compulsory)

Maximizing the loudness of the final mix (most important)