# Full-stack product engineering

Canonical: https://gaboesquivel.com/fullstack

My full-stack work usually pairs a client people see with the system that makes it real: a mobile assistant and the admin behind it, an exchange and its matching engine, a banking app and the partner integrations it leans on.

The decisions that matter sit on the boundaries between them. That's where I choose what becomes a service, what stays in the client, and what nobody downstream should have to think about twice.

## AI products across mobile, web, and data

LegalAgent runs two clients against one system: an Expo assistant for attorneys, and a TanStack Start admin where the team manages Microsoft SSO access, system prompts, and the document categories retrieval draws from. I built both sides of that boundary.

- [LegalAgent](https://gaboesquivel.com/project/legal-agent)

## Token flows across contracts, data, and interface

A bid at Bitlauncher could only settle in the protocol's token, so the token bridge became the full-stack problem. Swapping USDT, USDC, or BITUSD into USDCred touches contracts, indexed events, wallet balances, and the bidding interface all at once.

- [Bitlauncher](https://gaboesquivel.com/project/bitlauncher)

## Regulated products and exchange infrastructure

At Wink the React Native app sat on a serverless AWS backend I also built, and partner-bank APIs moved deposits, transfers, and account data through it. At Bitcash the exchange UI ran on a React, Node.js, PostgreSQL, Hasura, and Google Cloud stack I architected, matching engine and realtime chat included.

- [Wink](https://gaboesquivel.com/project/wink)
- [Bitcash](https://gaboesquivel.com/project/bitcashbank)

## Writing about product systems

- [Product Engineering](https://gaboesquivel.com/blog/2026-09-product-engineering)
- [Engineering in the AI Era](https://gaboesquivel.com/blog/2026-02-engineering-ai-era)
- [Modern Next.js Web3 Architecture](https://gaboesquivel.com/blog/2024-10-modern-nextjs-web3-architecture)
- [Comparing Ethers.js and Viem/Wagmi](https://gaboesquivel.com/blog/2024-07-viem-wagmi-ethers)

The [work library](https://gaboesquivel.com/work) has a page for each project, with the stack and the implementation details.

The roles and dates behind this work are on the [full-stack CV](https://gaboesquivel.com/cv?focus=fullstack).