For me standard means used by more than one company and well documented. It also means that most companies use it in the same way. Basically all 3rd party Frame

For me standard means used by more than one company and well documented. It also means that most companies use it in the same way. Basically all 3rd party Frameworks and tools are "standard" Custom means that you wrote a unique solution for yourself. No-one else uses your solution. New hires have to learn it from scratch either by reading your code or your own custom documentation. There is obviously more work to onboard people onto a custom solution. You can hire people who understand the standard solutions. Postgres isn't a queue or a message broker. You are writing your own queue that depends on postgres. Your custom queue will have complexity that new hires have to learn. No new hire will have used your custom in house queuing system before. If you want to use SQS that's a great idea. I support using standard solutions.