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- Decouple lambdas with queues and events, SQS, SNS and S3 events are your friends here

- Use environment variables

- Use step functions to create to create state machines

- Deploy using cloudformation templates and serverless framework

Since you can not trigger Lambda with SQS, I don't recommend using Lambda with SQS. You end up having to use some other tool to trigger the Lambda invocation, and polling SQS from there.

Better to use a stream that can trigger Lambdas natively - like SNS or Kinesis.

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