I built a 500K LOC production app alone in 7 months. Here is the proof
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Here is the proof, a 5-hour uncut live session, no edits, no cuts: https://youtu.be/VPrU8WZJOVsFull article: https://medium.com/@bonjourjoel/i-built-a-500-000-line-produ...I believe I am the first human to have done this in a documented, verifiable way: maintaining a stable production-grade 500,000-line TypeScript codebase as a solo developer, using an AI coding assistant I built myself.If you know someone who has done the same, one person, 500k lines, documented proof, please write their name in the comments.
HN · launched May 10, 2026 · 5 upvotes (top 89%) · 0 views
Niche: developer community and collaboration platforms · 62 launches, 3 in the last 7 days · Explore this niche →
Category and tags
- Horizontal
- Hobby / open-source project
More like this: all 62 launches in developer community and collaboration platforms →
Could you build this?
Yes The submission itself is a demonstration and proof-of-concept of building and maintaining a large-scale application entirely through solo AI-assisted development.
Discussion
2 comments analyzed.
Concerns raised: Lines of code not a meaningful quality metric, Unclear what was actually built versus assisted, Claim of zero regression difficult to verify
Competitors
Other products that read as similar to this one : 105 launches clear the similarity bar, closest 8 shown.
Attention rank: #92 of 106 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 188 days after the earliest competitor.
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