Build logs · series
Collimer Build
Build logs from Collimer, the GEO product Sandcastle is shipping. What we built, what broke, what the numbers said.
- Audience
- Builders and operators
- Rhythm
- Weekly while active
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Posts (11)
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One dependency that couldn't launch took the whole app down with it
A Chrome process wired as a permanent child of the root supervisor exhausted its restart budget when it failed to launch, and the exit cascaded into shutting down scans, dashboards, the API, and background jobs together.
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Two fixes that were quietly guessing, corrected the same week
A database-pool fix and a marketing-attribution default were both confidently wrong in the same shape: each cited its own rationale, and nobody had checked that rationale against the actual code.
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Naming Profound, and choosing to go slower on purpose
Collimer's second launch-post cycle made two real decisions: name a real competitor directly instead of gesturing at 'tools in the market,' and recontextualize the original ten-design-partner ambition instead of quietly replacing it.
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We built an A/B test before we had anyone to test on
The homepage now leads with recommendations, not a score. We built EXP-01 to measure the reframe before real traffic arrived.
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Launching Collimer to ten hand-picked design partners, not the world
Collimer went live July 9: one LinkedIn post, 661 impressions, a handful of DMs, two design partners in and a third coming. Plus the numbers we cut before posting, and the competitor one-liner that did not survive our own fact-check.
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How to keep a marketing site in sync with the product it describes (ours wasn't)
Collimer's site and app live in separate repos, so we made the product's own pricing config the single source of truth pricing and engine claims sync from.
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Stretching the vertical
A scan in a second vertical revealed how SaaS-coded our probes were. The fix made us question whether 'alternatives' is even a real category for local services.
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How we built an MVP with parallel Claude Code agents in three days
Parallel Claude Code agents built the Collimer MVP end to end in about three days and 67 commits. The pace is only the headline. The point is what kept it from being a pile of code.
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A clickable mockup in an afternoon
An afternoon of Phoenix LiveView produced fourteen connected screens. The clickable mockup is the cheapest discovery tool we have for an AI product.
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Three providers, one methodology card
We wired three LLM providers through one probe runner. The output is a methodology card that shows exactly how each answer was produced.
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Recommendations are the secret
Every GEO tool ships a beautiful dashboard. We bet the value is the recommendation, and rebuilt Collimer so every rec is shippable as written.