Cover Photo for JSMonthly London July Meetup #208

JSMonthly London July Meetup #208

In-Person

Address available to attendees

Ready to join in on the fun?

🚀 Join us on Thursday, 23rd July for our JS Monthly Meetup!

We’re meeting in person at the Zoopla office - come along for a great evening of tech talks, networking, and community.

📍 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

🙏 A big thank you to Zoopla for hosting us, and to 1771 Technologies for sponsoring food and drinks 🍕🥤❤️

🕕 Rough timings

6:00 - 6:30 PM: Doors open & refreshments 🍕🥤
6:30 - 6:40 PM: Welcome & introduction
6:40 - 6:55 PM: A better way to build data grids - Lee Beydoun
6:55 - 7:25 PM: Building Confidence at the Boundaries: An Outside-In Testing Strategy - Eduardo Aparicio Cardenes
7:25 - 7:40 PM: Break ☕
7:40 - 8:20 PM: Productionising a JavaScript runtime with AI - Johannes Stein
8:20 - 8:30 PM: Closing
8:45 PM: We’ll start heading to the pub 🍻
9:00 PM: Venue close

See you there! 👋

🇬🇷 Join CityJS Athens

📝 Have your say - fill in the form

❤️ Sponsor or host us

🎤 Give a talk - share something cool with the community

Presentations

Lee Beydoun

A better way to build data grids

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.

Primary Photo for {0} {1}

Eduardo AC

Building Confidence at the Boundaries: An Outside-In Testing Strategy

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.

Johannes Stein

Productionising a JavaScript runtime with AI

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.

JSMonthly London July Meetup #208

In-Person

Address available to attendees

🚀 Join us on Thursday, 23rd July for our JS Monthly Meetup!

We’re meeting in person at the Zoopla office - come along for a great evening of tech talks, networking, and community.

📍 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

🙏 A big thank you to Zoopla for hosting us, and to 1771 Technologies for sponsoring food and drinks 🍕🥤❤️

🕕 Rough timings

6:00 - 6:30 PM: Doors open & refreshments 🍕🥤
6:30 - 6:40 PM: Welcome & introduction
6:40 - 6:55 PM: A better way to build data grids - Lee Beydoun
6:55 - 7:25 PM: Building Confidence at the Boundaries: An Outside-In Testing Strategy - Eduardo Aparicio Cardenes
7:25 - 7:40 PM: Break ☕
7:40 - 8:20 PM: Productionising a JavaScript runtime with AI - Johannes Stein
8:20 - 8:30 PM: Closing
8:45 PM: We’ll start heading to the pub 🍻
9:00 PM: Venue close

See you there! 👋

🇬🇷 Join CityJS Athens

📝 Have your say - fill in the form

❤️ Sponsor or host us

🎤 Give a talk - share something cool with the community

Presentations

Lee Beydoun

A better way to build data grids

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.

Primary Photo for {0} {1}

Eduardo AC

Building Confidence at the Boundaries: An Outside-In Testing Strategy

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.

Johannes Stein

Productionising a JavaScript runtime with AI

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.