MARLIN JAYASEKERA_

cto & cofounder @ stealth

building tools that measure whether AI agents actually work

agents · evals · systems · the occasional hardware project · Brooklyn, NY

WRITING 3 ENTRIES · LATEST 3

003 2026-07 Why Evals Are The Moat 2min 002 2026-06 The CUA Reliability Gap 1min 001 2026-05 Data Is A Pipeline, Not A Number 1min

TRAJECTORY EXPERIENCE LOG

2023 → NOW STEALTH cto & cofounder Building in stealth. Tools to measure whether AI agents actually work before anyone bets real money on them. More soon.

2023 → 2024 BECAUSE cto Real-time analytics and attribution for B2B. A live picture of which actions actually move revenue.

2021 → 2022 RENORUN special projects Instacart for construction. Same-day delivery of building materials to the job site so contractors never lose a day on a hardware run. I built and launched its Pay Later financing product, which grew to about 10% of revenue.

2017 → 2022 STORAGE FELLOWS cofounder & cto Storage without the storage unit. On-demand valet storage that picked up, kept, and brought back your things whenever you needed them. I built the whole platform from scratch.

2021 CONCORDIA b.eng, software engineering Software Engineering, Montreal.

LAB 6 PROJECTS

cmux-companion building

An iPhone companion for cmux. Mirror notifications, control your workspaces, jump between surfaces, and fire off voice commands to your agents from your phone. A Go bridge on the Mac talks to a SwiftUI app over the LAN.

go · swiftui · websocket

caravan building

Drive for devs. One command spins up your entire ~/code workspace on any machine or agent sandbox, identical every time, with secrets decrypted and toolchains pinned. The good moment is a fresh sandbox cold-starting with your whole setup already there.

go · git · sops

ipod-classic-mod building

A 6th-gen iPod Classic, rebuilt: 1TB of storage, USB-C, Bluetooth, and a battery that actually lasts. Owning your music still beats streaming.

hardware · flac

vouch building

An accountability app for couples chasing goals together.

hono · sqlite · self-host

all projects →

NOW UPDATED 2026-07-08

Heads down on a stealth startup. Building tools that help teams trust what AI agents do before they ship them.
Writing more. Trying to get the things I think about all day, agents, evals, reliability, out of Slack and into actual essays.
Rebuilding a 6th-gen iPod Classic. 1TB, USB-C, Bluetooth, a battery that lasts. Offline music still feels better than streaming.

full /now →