Ask HN: How can I consistently deliver high-quality work with minimal issues?

You will continually get better at not just writing the right code, but at interpreting requirements into the right code. You will learn the edges and corners where bugs will hide. And sometimes you'll write them anyways, because that's life. You'll fix it in the future.

In this trade, a lot of orgs put a lot of emphasis on "sprints" and "deliverables", but you really have to look at software development as a continuum. Optimizations and bug fixes are a part of this continuum, and any good team has space for these things in planning.

Not all teams recognize this, however, and I would recommend discussing with the other engineers on your team how you can work together to advocate for this. No sprint can be 100% features. Software requires upkeep. Bugs are a natural part of this.

Small pieces of software incrementally delivered is the key.

Never ship a big feature at once

Sounds to me like you need to do more testing. You should have automatic integration tests that run with your CI/CD pipeline to make sure you don't break seemingly unrelated bits, and most importantly you need to actually test the application like a real user - like QA will test it - before you merge. Writing code that works is only half the battle. You need to test it and get it ready for production before you merge. Most importantly you need a robust test suite with >90% coverage, to avoid breaking things by accident. Focus on making sure your code is stable, rather than trying to get each task done as quickly as possible.

This is literally what seniority/experience means.

This is why more experienced developers get paid more — because the deliver more consistent, higher quality, less issues work.

You work more, on more projects etc. and you eventually grow. Doesn't matter at all which tricks, approaches do you use.

The best investment in you quicker growth - is to find bigger, more complex and important project to tackle, and better team.

No 1 thing you need is seriousness to do high quality work. No need for any checklists, keep working until its 100%