Write/help me with adding bitcoin mining code to my software

Hi,
If you are reading this, it means you know about bitcoin, blockchains and mining.
I already have very well established software that is widely used all over the world. I am looking to add bitcoin mining version of the software to the portfolio. (App will be distributed legealy with full user knowledge about mining)
I need help with writing the mining code that can be than implemented with my existing app. Code will be implemented by out developers.
Please contact me if you can help.
Only people who know the stuff. Thank you to agencies..