Hack Night London - Tessl, King's Cross

** Don't forget to invite your friends / share **

What's Hack Night?

Five hours. One room full of builders. Zero fluff. As many demos as we can.

Hack Night at Tessl is a London evening for people who would rather build than posture. You show up with an idea, find a team if you want one, spend a few focused hours shipping with a DJ in the background, and demo what you made before the night ends. Then we head to the pub.

When: May 13, 2026 | 4:00 PM - 8:45 PM BST Where: Tessl office, London

Who: Hosted by : Adam Chan (https://www.linkedin.com/in/itsajchan/), Sam Hooti (https://www.linkedin.com/in/sam-h-b79850387) and HackerSquad with Tessl

The Judges: Four people who've actually built things worth shipping. They'll see your demo and give you real feedback.

James Pimentel Pinto — First European iPhone developer and inventor of the hybrid app model. Built the first mobile banking, eCommerce, and sports apps in the world, with over 27 App Store #1s. Expect feedback on craft, originality, and whether what you shipped could actually live in users' hands.

https://www.linkedin.com/in/jamespp/

Vy Alechnavicius — Design and product leader, startup advisor. Has worked in human-centric AI, product craft, and developer experience. Expect feedback on product sense and whether what you built actually respects the person using it.

https://www.linkedin.com/in/vaexperience/

Lachlan Chavasse — Former founder of useDaily (personal AI), now launching Frontier Tower in London. Expect feedback on what's actually novel, where the real leverage is, and whether your idea holds up outside the demo.

https://www.linkedin.com/in/lchavasse/

Pedro Proença —Engineering leader who scaled a marketplace startup from 50 to 5,000 people, building the search and personalization that connected buyers and sellers across 40 countries. Then at big tech, helping tens of thousands of engineers ship safely to billions of users. Now at a scale-up working on AI adoption. Expect feedback on what pain you're actually solving, and whether people would keep using what you built.

https://www.linkedin.com/in/pedro-proenca

Here's How It Works

4:00 PM - Doors OpenCheck in, grab food, meet other builders, form groups, (or solo hack if you want) and decide what you're making.

4:30 PM - Opening ContextQuick welcome from the host and venue partner so everyone knows the flow for the night.

5:00 PM - Short Technical RemarksIf there are host or sponsor remarks, they stay short. The point is to get useful context, then get people building.

5:30 PM - Build TimeHeads down. Music on. Ship something. Use the time to test an idea, explore a tool, or finally build the thing you've been sitting on.

7:30 PM - Demo TimeShow what you made. Get feedback. See what everyone else shipped.

8:45 PM - Wrap UpFinal demos, shout-outs, and a clean finish to the night. And of course, Pub! We're heading to a pub nearby for a pint and a proper debrief. Come if you want to keep the conversation going.

What You Need to Bring

Your laptopAn idea, or the willingness to find one thereA bias toward shipping

Food will be handled. The space is handled. You just need to show up ready to build.

Who Should Come?

This is for developers, founders, technical operators, and AI-native product people who like building in the same room as other ambitious people. All skill levels are welcome as long as you're ready to participate.

Why It's Worth It

Hack Nights create the kind of pressure that helps you actually finish something. You leave with a working prototype, a new collaborator, or at minimum a stronger idea than the one you arrived with.

Ready to Build?

Register below once the page goes live. Space will be limited to the room capacity at Tessl.

A big thanks to our sponsors for making this happen:

Tessl

Tessl helps you find, install, version, and evaluate the skills and context your coding agents rely on, so they behave consistently across tools and projects.

https://tessl.io/

Neo4j

Transform Your Data Into Knowledge for Deep, Contextual Understanding

Connect and organize your data with a knowledge graph to see the bigger picture. Capture all the relationships with their context for deeper understanding. Unify silos to improve model accuracy and make better predictions

https://neo4j.com/

Hubble

At Hubble, you can book 1:1 calls with experienced founders, operators, and investors who’ve actually done the thing. So you can learn faster, make better decisions, and keep moving forward.

Real help from people who’ve been there.

https://www.hubble.social/

Codex (OpenAI)

Built to drive real engineering work

From routine pull requests to your hardest problems, Codex reliably completes tasks end to end, like building features, complex refactors, migrations, and more, powered by OpenAI’s frontier coding models.

https://openai.com/codex/

See you soon!

Builders Collective

https://www.linkedin.com/company/thebuilderscollective/