Ask HN: How are you using Go to write production-grade back end services?

As the title suggests. Interested to see how (and what) companies are using Go to make production grade backend services.

- What are you using for tests?

- Do you use dependency injection or any mocking frameworks?

- Are you using any routing frameworks?

- HTTP web frameworks?

Would love to know the ins and outs! What is good, what do you not like about Go, any pain points? Anything you would want to improve?

Thanks!