Handling secrets

Hello Everyone!

I am working on a project and I am trying to find the best way to securely store and handle secret keys (like secretEncryptKey, AWSKeys, etc.) without exposing them in code. I am looking for solutions that do not include:

• Hardcoding the secrets directly in the code.
• Using Firebase or similar services to fetch the keys.
• Storing secrets in the build.gradle file.
• Relying on.gitignore to prevent keys from being tracked by version control.

I am seeking some secure and scalable ways of handling secrets—be it a third-party service, encryption methods, or a secure storage solution that integrates well with the project. Any suggestions or best practices would be much appreciated!

Thanks in advance for your insights!