The 70% problem: hard truths about AI-assisted coding
The definitive essay on why the last 30% still needs engineering.
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What are the limits, when do I still need a real engineer?
Vibe coding gets you roughly 70% of the way: prototypes, internal tools, and early MVPs. The last 30% (security, scale, complex integrations, gnarly bugs) is where AI-generated code quietly falls apart, and where thousands of startups are now paying $50K-500K for rescue engineering. Bring in an engineer before real user data, real money, or real traffic arrives, and treat every AI output touching production as unreviewed until a human has read it.
Go deeper
20 resources.
Cursor CEO warns vibe coding builds 'shaky foundations'
When the biggest AI coding tool's CEO warns you, listen.
Open fortune.com →Andrew Ng: vibe coding is a bad name for a very real and exhausting job
The world's best-known AI educator punctures the effortless myth.
Open developers.slashdot.org →Measuring the impact of early-2025 AI on experienced developer productivity (METR)
The gold-standard RCT: AI made experts 19% slower while they felt faster.
Open arxiv.org →METR's AI productivity study is really good
A working engineer's readable take on what the study does and does not prove.
Open seangoedecke.com →Vibe coding as a software engineer
How professionals actually draw the line between vibes and production.
Open newsletter.pragmaticengineer.com →How AI-assisted coding will change software engineering: hard truths
The industry's most trusted engineering newsletter maps the real limits.
Open newsletter.pragmaticengineer.com →AI coding tool wiped out a software company's database in 'catastrophic failure'
The SaaStr incident: what happens when an agent touches production.
Open fortune.com →Vibe coding service Replit deleted production database
The technical blow-by-blow of the most instructive AI agent failure yet.
Open theregister.com →Vibe coding technical debt: 8,000 startups are now paying to rebuild
Quantifies the rebuild bill waiting at the end of unreviewed AI code.
Open getcreatr.com →The software engineers paid to fix vibe coded messes
Rescue engineering is now a job title; know why before you need one.
Open developers.slashdot.org →The vibe coding delusion: startups paying the price for AI-generated technical debt
Case studies of the $50K-500K cleanup invoices.
Open techstartups.com →What are the limitations of vibe coding?
Unusually candid limits list from a vibe-coding platform itself.
Open emergent.sh →The vibe coding hangover: what happens when AI writes 95% of your code?
What month six looks like on a codebase nobody understands.
Open hackernoon.com →Vibe coding is a dangerous fantasy
The strongest steel-man of the skeptic case, worth absorbing.
Open nmn.gl →'Vibe-coding' influencers are ruining your life (the solo developer lie)
Deflates the hype accounts so you can set honest expectations.
Open theseniordev.com →Vibe code is legacy code (Hacker News discussion)
Hundreds of working engineers debate where the boundary really sits.
Open news.ycombinator.com →Vibe Coding: on the power and danger of programming with AI
A balanced essay on capability versus responsibility.
Open willem.com →Vibe coding: because who doesn't love surprise technical debt!?
A code-review company catalogues the failure patterns it sees daily.
Open coderabbit.ai →Vibe Code Rescue
What a rescue service looks like when you do hit the wall.
Open vibecoderescue.com →More in Vibe Coding
- Why can non-technical founders now build software with AI? 18 →
- What tools should I start with (Cursor, Claude Code, Lovable, Replit, Bolt, v0)? 19 →
- How do real founders ship an MVP with AI in days instead of months? 18 →
- What actually counts as vibe coding, and how is it different from serious AI-assisted engineering? 18 →
- How do I plan and prompt so the AI builds what I actually want? 18 →
- How do I keep my vibe-coded app from getting hacked? 19 →
- How do I get my vibe-coded prototype ready for real users? 18 →
- How do I add accounts, a database, and payments to my vibe-coded app? 18 →
- What do I do when the AI gets stuck, loops, or breaks things it already built? 18 →
- How much does vibe coding really cost, and how do I stop burning credits? 18 →
- Do I still need to learn to code, or is prompting enough? 17 →
- Can vibe-coded products become real businesses? 19 →
- Can I vibe code a mobile app and get it into the App Store? 18 →
- How do I avoid losing work? Version control for founders who don't code 19 →
Also in Starting Up
The same ground, over in Build the product, our Starting Up track.
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