What would you say is the % lines of code written by you vs an LLM these days? (Auto completion counts as you wrote it)

A decent chunk of YC start ups say 95%

I have 2 thoughts:

1) vibe coding is great for prototypes but the latest trend is a flurry of security issues & high cloud bills in those apps — autopilot in airplanes have been around for ages but we still need an experienced pilot in the cockpit

2) if you establish a clean pattern in a large scale production-grade codebase, commit a markdown file about it so that LLMs can help abide by the pattern when building new features

A decent chunk of YC start ups say 95%

I have 2 thoughts:

1) vibe coding is great for prototypes but the latest trend is a flurry of security issues & high cloud bills in those apps — autopilot in airplanes have been around for ages but we still need an experienced pilot in the cockpit

2) if you establish a clean pattern in a large scale production-grade codebase, commit a markdown file about it so that LLMs can help abide by the pattern when building new features

https://techcrunch.com/2025/03/06/a-quarter-of-startups-in-ycs-current-cohort-have-codebases-that-are-almost-entirely-ai-generated/

doing the right thing.
working hard.
being optimistic.
putting the team over the individual.
pushing boundaries with creativity.

eng @ base