A Bank Built Its Own Coding Agent. It Took Off — Felipe Felisola Caso & Francesco Galletta, Monzo

Monzo's in-house agent started as an emoji you could react with in Slack. Now it authors over 10% of all merged PRs across Monzo's tech teams and runs more than 1,800 tasks a day. Felipe and Francesco explain why it worked so fast. Their answer is the "lots of little multipliers" Monzo already had: an MCP gateway into internal tools and knowledge, a sandboxed agent orchestration system built for a regulated bank, and a platform that turns the agent itself into a building block. That building block now handles incidents, on-call data quality and requests from non-engineers. Chapters: - 00:00 Intro - 00:28 Monzo by the numbers - 01:37 The Slack agent that went viral - 02:51 10% of merged PRs, 1,800 tasks a day - 03:51 LLMs = lots of little multipliers - 05:04 The MCP gateway - 05:59 Agent orchestration in a sandbox - 08:37 The agent as a building block - 10:07 Incident mode and on-call - 12:12 Non-engineers shipping changes - 12:57 Why keep building it in-house Felipe Felisola Caso & Francesco Galletta, Monzo: https://monzo.com Join us in SF for the second annual AIE CODE summit: https://aie.codes our last flagship summit of 2026. Applications live now!