I work at a startup so we have a small team. But for us it goes:

1. Develop some feature (me and the other engineer are full stack)

2. Send to other engineer for code review

3. Deploy to a staging site, with test data. Send to product girl to QA

If she finds a bug (or realizes her design doesn’t look as right in practice as she envisioned) she sends back with notes, we implement or fix them, and then start back at 1-2.

I think QA is different for every org but I believe there should be steps. At bigger orgs there should be QA for every feature developed (so each team should have a QA person) and then an integration QA of the current beta.