@kyeongeundev

Kei

@kyeongeundevJoined September 2026

Building AI products and backend systems. Writing about RAG, LLM evaluation, Supabase, AI UX, and the lessons behind real implementations.

About

I'm Kei, a developer building AI products and backend systems. I write about RAG, LLM evaluation, Supabase, AI UX, and the product decisions behind RECO and TRAYCE.

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KKeikyeongeundev.hashnode.devSep 22 · 9 min read

I Only Journal When Things Get Hard — Why I Built RECO

I started building RECO because I came to believe that self-understanding needs evidence too. RECO is an AI journaling product that turns personal voice notes into searchable memory. Instead of asking

Kei

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Kei's blogs

Recently published

I Only Journal When Things Get Hard — Why I Built RECO

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Kei

About

Available for

Kei's blogs

Recently published

I Only Journal When Things Get Hard — Why I Built RECO