If you're working at a company whose codebase isn't 100% open source (or in the process of being open sourced) you're probably going to lose. The advantages of mass-collaboration from open source tools & processes far outweigh the benefits of keeping certain tech proprietary.

Eng @ Coinbase, working on Base
https://bayardo.org

*there are always exceptions, but I expect them to become few and far between, especially as critical applications continue to migrate onchain. Onchain composibility brings yet another advantageous dimension to being fully open.