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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Opinions wildly vary but you can use this as a starting point on self-learning: https://github.com/ossu/computer-science
Since you already have a background in programming, do some projects. Project Ideas here's a link for tutorials and ideas. Do your own implementation and put your source code / demo on Github. This gives you something to talk about during an interview. You can talk about how you approach and solve a problem, you can also demonstrate how fast you learn, "I learned React in 2 weeks and made this.". Most importantly it shows initiative and a desire to learn.