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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.
I can't suggest this enough times but https://dmoj.ca/ is the best resource I've found for practice questions. It has past coding competition problems on there that range vastly in difficulty. You'll need to make an account to get started but it's really worth it. I suggest to start off with problems that are 1-3 points, then go up once you feel more confident. It's a really great site, much better than finding your own coding problems since they have online judges that can run test cases for you.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.