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Experiences

Mark Rosario's experiences

Read what @markrosario has shared while building in public.

Lvl 5·Builder
How to/GuideOct 31

How we verify anything before we call it done

Our standing rule, set after a website we thought was deployed wasn't: inspect the actual thing before accepting it. A success message, a finished build, a merged pull request, a worker's report — all of those are claims. The proof is the live surface, read back and compared against what was asked for. It costs a few…
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Lvl 5·Builder
What workedOct 31

One core, four businesses: replicating our agent system for partners

Instead of building a new tool for every client, we built one core — it learns a business from its founder: their offers, people, voice, and rules — then tailored it. In one week that core became four working systems: our own company, a hair-making school in Nigeria that reached a 100% founder profile and activation,…
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Lvl 5·Builder
Lesson learnedOct 30

A browser can carry a lot of things. An API key is not one of them.

We burned hours installing production API keys through a browser agent. Three keys went in and none of them ever authenticated — copying a one-time-displayed secret through a screen distorts characters, and the install reports success anyway. The provider's own "last used" stamp told the truth: blank. The fix was bori…
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Lvl 5·Builder
Lesson learnedOct 30

A second engine reviewed our code — and caught a live security hole in it

We build with more than one AI engine, and no engine checks its own work. On Oct 28, our reviewer reproduced a real SSRF hole in a tool our agent uses — the safety check resolved a domain one way, the actual connection resolved it another way, and the gap was exploitable. The build failed review, we accepted the verdi…
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Lvl 5·Builder
What failedOct 29

A “failed” post that had actually published — and the duplicate it caused

On Oct 26 we shipped a film to 12 surfaces. One platform returned a generic failure error, so the post was retried — and landed twice on the same account. The failure message was wrong; the first post had gone live. Now the rule in our shop is simple: a failure banner is a claim, not a fact. Before any retry, we read…
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Lvl 5·Builder
Lesson learnedOct 29

Day 1: The Night the Company Got Its Rooms

Day 1 of the public record. Today Faqada stopped being a solo build — my first team member's AI came online and joined the company. I'm keeping a daily public record of building Faqada from here: what ships, what breaks, and what we learn.
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