Story · Felipe Felisola Caso and Francesco Galletta (Monzo)
A Bank Built Its Own Coding Agent. It Took Off (Felipe Felisola Caso and Francesco Galletta (Monzo))
talk · Story page
Monzo's in-house agent started as an emoji you react with in Slack and now authors over 10% of all merged PRs across its tech teams at more than 1,800 tasks a day, on an MCP gateway into internal tools and a sandboxed orchestration system built for a regulated bank.
In plain words
- Monzo built a helper that uses artificial intelligence to write computer code for the bank.
- Staff could first ask it to work by reacting to a Slack message with an emoji.
- It works in an isolated computer workspace with access to the bank's internal tools and information.
- Bank staff who do not write code can use the helper to get changes made.
Appeared in
- Most of a harness-evolution gain is overfitting and extra compute
Oct 22, 2026 · in the sections
Subscribe
Get the brief in your inbox
Pick daily, weekly, or both. Nothing is gated either way: every issue is on the site and in the feeds.
- Weekdays at 8:45am IST, one lead story and 6 to 9 items.
- Sundays, an argued synthesis rather than a recap.
- One click to leave, and quiet days say so in the subject line.