Fig. 1 / The operator

I'm Ian Duncan, a full-stack developer living in The Hague.

I've been writing in Haskell and other functional programming languages professionally since 2014, working with companies from 3 to 1100 people in size to build reliable, debuggable, maintainable software.

I currently work at Mercury, where I spend a lot of time making it easier for our other engineers to write code that is correct by construction, resilient to failure, and easy to work with in production.

Before that, I served as Principal engineer at Forge Global, a private equity marketplace where I helped build a platform for trading private company shares. I worked with engineering executives to plan and execute our merger with SharesPost, helping to integrate our two engineering teams and train Rubyists in how to use Scala.

Work

  1. Company
    Mercury
    Role
    Stability Engineering
    Date
  2. Company
    Forge
    Role
    Principal Engineer
    Date
  3. Company
    Betterteam
    Role
    Jack of all trades
    Date
  4. Company
    Circle CI
    Role
    Engineer
    Date
  5. Company
    Faithlife
    Role
    Engineer
    Date
Download CV

Talks

  1. Mercury at Replay 2025 | Production Patterns for Incremental Temporal Adoption

    Replay 2025 • March 2025

Colophon

The structure of this site, writing that ranges from rough notes to long-lived essays, each marked with a stability level and revised over time, owes a debt to Maggie Appleton and her work on digital gardens.

The visual language, monospace labels, status readouts, and all, is inspired by the design work at Oxide Computer Company.

Built with Astro. Set in IBM Plex Sans, Space Grotesk, and Martian Mono.