Rajeev Gill

I build practical software around AI, data, analytics, and adtech.

My work sits between product thinking and implementation, with a bias toward systems that make real work less messy.

Based in London. Interested in useful AI, clearer measurement, and software that holds up outside a demo.

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Selected projects

Things I have built

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Local LLM Lab interface showing the installed-model inventory and measured comparisons.
AI & Agent Systems

Local LLM Lab

A measured field guide to every local model installed on Apple Silicon.

PythonReactVite
Open GTM Index interface showing category leaders and ranked open-source tools.
Martech & Measurement

Open GTM Index

A transparent guide to open-source go-to-market software.

TanStack StartReact 19TypeScript
Hackathon Voting App interface showing the public scoreboard and consent-aware controls.
Products & Operational Tools

Hackathon Voting App

A production-ready single-screen judging app built for a live hackathon room.

Next.js 14ClerkPrisma

Recent writing

Notes from the work

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A Cost-Control Playbook for Codex Subagents

A decision playbook for running Codex subagents without token cost surprises — when to delegate, how to bound each worker, and how to measure what it actually cost. Built from three measured experiments on this site.

Have something useful to build?

I am always interested in thoughtful software, analytics, and AI work where the practical details matter.

Email me