Ask HN: Are LLMs good for implementing features in existing web apps?
2 endorphine 1 7/18/2025, 4:44:29 AM
So I have a typical medium-sized Rails codebase, but with significant code that's not the dead simple CRUD stuff. For example, it talks with third-party APIs, does user authentication, uses Postgres FTS plus some other things.
I'm bored to work on it lately, and I was thinking whether using an LLM I could implement new features for it.
Are any of the current models at this point yet? I guess it should need to have a big context so that it reads all the views/controllers/models.
If so, which tool would you use? Something like Codex or Claude Code?
Comments (1)
saadn92 · 9h ago
I recommend Claude Code or Cursor, they’re usually the best right now. If you implement new features, be very specific. The more vague you are, the more it’ll just implement whatever it wants. Be wary, it also ends up breaking stuff sometimes, which can be annoying. But it does pretty well with Rails imo