The only part of this that is a red flag is what the CTO said about unit tests. You need to know why he said that. An outsourced product that has a shitty tech stack and that growth rate are fixable problems lots of startups have gone through. But an attitude that "everything is fine, we don't need to be better" in that set of circumstances is a disaster.
My current company was in a similar situation a few months ago in some respects, but we were releasing constantly and desperate to improve. We're WAY better now, and we're getting measurably better in every single respect every day. The reason we're unrecognizable from what we were 4 months ago and why we'll be that way yet again is because we're desperate to improve and have NO egos. Not a single person on the team is anxious to be right - we're anxious to get better.
Find a team that's as anxious as you are to improve. That, you can't fix.
My current company was in a similar situation a few months ago in some respects, but we were releasing constantly and desperate to improve. We're WAY better now, and we're getting measurably better in every single respect every day. The reason we're unrecognizable from what we were 4 months ago and why we'll be that way yet again is because we're desperate to improve and have NO egos. Not a single person on the team is anxious to be right - we're anxious to get better.
Find a team that's as anxious as you are to improve. That, you can't fix.