What's the best way to go about saving private keys in a production app?

So in every codebase there are a few private keys for different APIs and purposes (like for checking JWT signs). in a backend codebase on which 10 people are working there is this chance that someone let out the private key to some external hacker. what's the current best practice to avoid such vulnerabilities?

Submitted February 28, 2020 at 09:44PM by fiveMop