How can I protect IP sensitive computational code so my website programmer cannot decode/read it, but can use it?

I have unique computations that are commercially valuable but I cannot code websites at a pro level, so I want to engage a pro (team) to do it.

How can I protect certain computational code lines so that they can be used in the site, but not decompiled into a readable form by anyone, including the coding team?

I have no preference for the website framework or language, so you choose - please let me know whatever works.