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For finding and validating an idea, you can read Lean Customer Development: https://www.amazon.com/Lean-Customer-Development-Building-Cu...

I highly recommend this book.

I've used tflint in a pipeline and it works well.

Red Hat is known to hire remote software engineers.

I would recommend reading Lean Customer Development:

I recommend that you use Route53 for DNS management.

If you're interested in running the application with Docker, Fargate can be a good option. You can also run the frontend on CloudFront.

For Redis and Postgres, you should consider RDS and ElastiCache which are managed services.

I would avoid using Kubernetes because it's probably too complex for what you're trying to do.

Designing Data-Intensive Applications is fantastic.