As someone who works in this space ( https://pythagora.ai ), I welcome new entrants to this niche. Currently, mainstream AI usage in coding is at the level of assistants and glorified autocomplete. Which is great (I use GitHub Copilot daily), but for us working in the space it's obvious that the impact will be much larger. Besides us (Pythagora), there's also Sweep (mentioned by others in the comments) and GPT Engine…
While you sound reasonable, I can't tell the difference between an honest opinion and a sales pitch here.
I see LLMs failing at coding daily (one of the "perks" of working in the space), and I'm incredibly bullish on this approach.
And I don't think it'll replace humans or junior engineers. As programmers, we've been "replacing" ourselves since the days of assembler that replaced direct machine coding. This is just another iteration of it.
(if you do want a sales pitch, here's one: https://twitter.com/senkorasic/status/1765769482985722267 )