**Please register on [Eventbrite](https://www.eventbrite.co.uk/e/ljc-meetup-at-capital-one-tickets-2003905765087) to join this event.** **Overview** LJC Meet-ups is a series of events, aimed at giving all Community members an opportunity to present at an LJC event. The London Java Community is delighted to invite you to our next LJC Meet-up at Capital One. Join us for an evening of technical talks, fresh ideas, food, drinks and networking with fellow developers and technology professionals from across the community. This month, we have two very different but equally fascinating talks lined up. From the engineering behind Capital One UK's Server-Driven UI to an exploration of just how far procedural generation can be pushed. **Speaker 1: Sean O'Toole, Staff Software Engineer, Capital One** Title: Finite States, Infinite Possibilities: Capital One's Server-Driven UI **Abstract:** Changing anything in a mobile app is slow going: a new binary, an app-store review, and then weeks of waiting for users to actually upgrade before your change reaches everyone. That's in stark contrast to how easily we change data and ship APIs internally, where a change can be live to 100% of consumers the same day. So why stop at shipping the data? Why not ship the UI itself? That's the idea behind Server-Driven UI: the server doesn't just return the data, it returns the UI definition too, which the client then renders. In this session we'll go behind the scenes of the real-world SDUI system powering Capital One UK's mobile apps — the Spring Boot service that turns finite states into infinite user journeys, all shipped without a single app release. We'll dig into the engineering that keeps it fast: fanning out a whole journey's data in parallel, coalescing duplicate calls so we don't stampede our own backends, and the honest reason we turned virtual threads down. **About Sean O'Toole** Sean O’Toole is a Staff Software Engineer and has been with Capital One for 11 years. During this time he

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