With millions of dollars being stolen from various smart contracts every other week... No, I don't trust those programmers.

Designing hash/crypto functions is a very different story than implementing contracts. You would need to know basically 0 of the math that would be needed to implement a hash function.

Would you trust them if programmers you did trust trusted them? A developer web of trust? An example of this would be followers/stars/forks on GitHub.

Maybe there is room for a distributed service which specifically enables this trust you're looking for?