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Day N

A development diary — building SaaS products solo with AI. Real decisions, real mistakes, real lessons.

Latest2026-07-07 · 6 min readAI Quoting

The Trades Are Raising Billions for AI. The Quote Is Still the Hard Part.

A QwenCloud Global AI Hackathon Track 4 build story: an AI quoting agent where Qwen handles negotiation rehearsal, database truth stays deterministic, and humans approve where money moves.

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AI Engineering

5
2026-04-30 · 8 minJumpOnion

Day 8: The LLM Succeeded. The Platform Killed the Connection.

First production smoke of a new training-plan endpoint. The browser hung, returned 504, and a manual refresh showed the plan was already there. The LLM finished; the platform gateway killed the client first.

2026-04-22 · 7 minJumpOnion

Day 6: A Button Name Killed My Algorithm

A month of algorithm tuning hit clean calibration on real videos. Then a parent uploaded one, and the system reported an impossible air-time reading. The algorithm was right. The button label was the bug.

2026-04-14 · 8 minJumpOnion

Day 3: When AI Lied About Dead Code (30 Hours of Silent Failures)

My AI partner deleted production code with absolute confidence and labeled it 'dead code, anonymous uploads.' 987 tests passed. The deploy went green. Thirty hours later, a paying customer noticed.

2026-04-13 · 7 minJumpOnion

Day 2: 6.47 Seconds of Air Time (The Jump Lasted 0.7)

The first attempt at detecting a figure skating jump measured 6.47 seconds of air time — on a jump that lasted 0.7 seconds. Three failed approaches, then the system rescued itself.

2026-04-08 · 6 minJumpOnion

Day 1: Building a Figure Skating AI — Why I Started

My kids train figure skating several days a week. Coaches cost $120/hour and their time is limited. I built an AI that diagnoses jumps in 60 seconds — here's why I started and what the first day looked like.

Build in Public

3
2026-07-07 · 6 minAI Quoting

The Trades Are Raising Billions for AI. The Quote Is Still the Hard Part.

A QwenCloud Global AI Hackathon Track 4 build story: an AI quoting agent where Qwen handles negotiation rehearsal, database truth stays deterministic, and humans approve where money moves.

2026-06-26 · 4 minJumpOnion

When My Figure-Skating AI Called a World Champion's Triple Axel "Under-Rotated"

During development I pointed JumpOnion's rotation detector at a world champion's textbook triple axel. It flagged under-rotation — and that single false positive decided how I built the rest of the product.

2026-06-26 · 3 minIvyBloom

One Person, Two Kids, and 140,000 Lines of Code

I'm one person. With AI I built and still maintain a learning app for my two kids — 85 API routes and around 140,000 lines of code. Here's what "AI-built" actually means when your entire user base is two people you see at breakfast.

Other

3
2026-06-05 · 9 minEnterprise AI

"AI Engineer" Is a Fake Job Title

A company decides it needs AI, hires an expensive 'AI Engineer,' and stalls at month three. Then it hires someone pricier — and stalls again. The logic of the hire was broken at the root — and the role that actually works has no market label yet, because it can only come from inside.

2026-04-25 · 9 minJumpOnion

Day 7: When AI Deleted 20 Customers' Data (in One SQL Statement)

After hunting down a real production blocker, the AI moved to clean up a stale cache. The SQL nullified three independent caches in one go. 20 rows updated. 7 paying customers' personalized diagnoses and training plans — gone.

2026-04-18 · 9 minSOP Framework

Day 5: 89K Stars. I Adopted 3 Ideas. Rejected 3.

An open-source AI agent framework went viral promising self-evolution through genetic mutation. The temptation was full adoption. The structured 5-dimension comparison was cheaper — and gave me 3 patterns to steal and 3 to reject on sight.

AI Governance

2
2026-05-21 · 9 minIvyBloom

Day 9: Your AI Debug Log Isn't Private

A grep over the knowledge vault hit a three-month-old AI session archive containing a full .env dump. The vault syncs to the cloud. The cloud indexes into AI search. A private debug log had become a three-layer attack surface.

2026-04-15 · 8 minJumpOnion

Day 4: Memory Is a Wish. Hooks Are the Law.

The anti-pattern was already in memory. The AI loaded it at session start. It walked right into the same bug anyway. Forty minutes from paying-customer report to root cause to deploy — and a deeper finding that rewired how I store rules.