Building Tools for Traders with Ian Henry

Ian Henry started his career at Warby Parker and Trello, building consumer apps for millions of users. Now he writes high-performance tools for a small set of experts on Jane Street’s options desk. In this episode, Ron and Ian explore what it’s like writing code at a company that has been “on its own parallel universe software adventure for the last twenty years.” Along the way, they go on a tour of Ian’s whimsical and sophisticated side projects—like Bauble, a playground for rendering trippy 3D shapes using signed distance functions—that have gone on to inform his work: writing typesafe frontend code for users who measure time in microseconds and prefer their UIs to be “six pixels high.” You can find the transcript for this episode on our website . Some links to topics that came up in the discussion: Bauble studio Janet for Mortals , by Ian Henry What if writing tests was a joyful experience?

You can listen to Building Tools for Traders with Ian Henry online on Radio and Podcast. Open the player on this page to stream the available audio.

Building Tools for Traders with Ian Henry is an episode from Signals and Threads by Jane Street.

This episode is 01:19:39 long.

This episode was published on May 28, 2025.

Yes. Use the heart button on the episode page to add it to your favorite episodes list.

Yes. This page shows related episodes from Signals and Threads when more episodes are available from the podcast feed.