JSMonthly and AI meetup

About this event

🚀 JSMonthly & AI London July Meetup

REGISTER HERE https://guild.host/events/jsmonthly-london-july-41kreh

Join us on Thursday, 23 July 2026 for another JSMonthly London meetup!
We’re meeting in person at the Zoopla office for an evening of JavaScript, testing strategies, runtime internals, AI-assisted engineering, React performance, food, drinks, networking and community.

This event is hosted by Zoopla, with food and drinks sponsored by 1771 Technologies.

📍 Location
Zoopla Office
The Cooperage
5 Copper Row
London SE1 2LH
To access Zoopla, please enter via the inner courtyard.
You can reach the courtyard in two ways:
Via the corner of Shad Thames and Horselydown Lane
Or via Copper Row
✅ Registration notes
Please make sure the name on your registration is your real full name, as the venue may need it for building access.
If you can no longer attend, please update your RSVP so someone else can take the spot.
🗓️ Rough timings
6:00 PM - Doors open, food, drinks and networking
6:30 PM - Welcome and community updates
6:40 PM - A better way to build data grids - Lee Beydoun
6:55 PM - Short break / speaker changeover
7:00 PM - Building Confidence at the Boundaries - Eduardo Aparicio Cardenes
7:30 PM - Q&A / speaker changeover
7:40 PM - Productionising a JavaScript runtime with AI - Johannes Stein
8:20 PM - Q&A
8:30 PM - Food, drinks and networking
9:00 PM - Event wrap-up
Timings may shift slightly on the night.
🙌 Host and sponsor
A big thank you to Zoopla for hosting us and to 1771 Technologies for sponsoring food and drinks.
Community events like JSMonthly London are only possible because companies and people in the JavaScript ecosystem are willing to support the community, share knowledge and create space for developers to meet in person.
🎤 Talks
A better way to build data grids
Lee Beydoun
Co-founder of 1771 Technologies
Talk length: 10-15 minutes
1771 Technologies is building LyteNyte Grid, a lightning-fast React data grid for complex, high-volume applications.
Lee will give a high-level overview of how LyteNyte Grid achieved best-in-class performance, with a small look at the technical details behind it.
Building Confidence at the Boundaries: An Outside-In Testing Strategy
Eduardo Aparicio Cardenes
Talk length: 30 minutes
Modern JavaScript applications rarely fail because of a broken function. They fail at the boundaries: APIs, authentication, feature flags, browser APIs, payments and third-party services.
From a real journey at scale with over 1.3 million transactions, Eduardo will explore an outside-in testing strategy that focuses on what matters most: the interactions between your application and the outside world.
You’ll leave with practical techniques to build confidence, reduce brittle tests and ship changes with greater certainty, regardless of your JavaScript framework.
Productionising a JavaScript runtime with AI
Johannes Stein
Talk length: 40 minutes
What does it take to turn a from-scratch JavaScript engine into production software?
Johannes will go into detail on spec conformance, CI and benchmarking infrastructure, and how to catch regressions before they happen. There will also be live demos of what you can build when you can shape the entire runtime, plus a closer look at the corners of JavaScript most of us never have to think about.
Johannes has spent his professional career working on JavaScript across web, mobile and backend solutions. With agentic engineering, he has been looking for more complex and sophisticated projects to use AI with.