MB

Things I've built.

A collection of projects I've worked on over the years.

  • Pool

    A collaborative checking account for shared finances. I built the banking platform from the ground up, plus an MCP platform that lets AI agents safely access financial data and move money.

  • Cash App Pay

    I led design and development of Pay Kit for Cash App Pay, serving 2M+ active customers and processing $100M+ monthly.

  • Square's Web Payments SDK

    I architected the JavaScript SDK that lets first- and third-party developers process $1B+ in monthly payments.

  • Pass Plum

    A password generator that creates memorable passphrases using common English words.

  • dotenv

    Loads environment variables from .env files. I was lead maintainer from 2012 to 2019; it has millions of weekly downloads and thousands of dependent projects.

  • jsPerf

    JavaScript performance benchmark service