What is the best certificates for Full-stack Developers in 2020?

Certificates act as a great filtering mechanism for developers - if a company highly values them, the dev should skip that job application.

Seriously though, placing high value on industry certs is a red flag that they don't know how to hire devs. I don't know if that's a variable worth optimizing for.

Experience is king. That said, if the company has an AWS contract, then the company might get a break on pricing depending on the number of certified people. That could make you more attractive.

If you are an ASC or in other security related position, then a GSEC or CISSP might be helpful. It seems security positions tend to focus more on certs and credentialing.

Probably the best certificate is not having any. In all honesty, I think a lot of employers would consider it a red flag as certificates are far from the norm for software engineering.