Sonia Kaul
Vol. 1 · No. 025 · A Living Publication
San Francisco, CA
02ProductProduct thinking, in writing

The arc from engineering
to product.

PRDs, design docs, and the writing I do to think clearly about what I’m building before I build it.

01★ featured

Stock Gut-Check

A weekly portfolio companion that productizes a real investment ritual: CSV upload → AI-generated game plan grounded in a persistent investment thesis. Wrote the full PRD before any code — scope, success metrics, risks, agent-design principles. Building now.

PRDAnthropic APINext.jsSupabase
Ship targetJun 2026
02★ featured

Tally: Household Payments

When your mom is your most critical customer. The brief was a WhatsApp reminder; the product turned out to be infrastructure for her financial life — built across four rounds of feedback, three near-rewrites, and one trust contract.

ProductUser researchTrust & securitySupabase
Real usern = 1(my mom)
Feedback rounds4
Sonia’s · Product24
Latest ✦
Last shipped · Tally: household payments trackerCurrently reading · Project Hail Mary, Andy WeirOpen obsession · dates (the fruit)Now playing · IT'S BEEN AWFUL, Isaiah RashadLast shipped · Tally: household payments trackerCurrently reading · Project Hail Mary, Andy WeirOpen obsession · dates (the fruit)Now playing · IT'S BEEN AWFUL, Isaiah Rashad
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