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July 2, 2026

{Tech:Europe} London: what was shipped with in a day

For our third time attending a hackathon hosted by the {Tech:Europe} team, we headed to Attio's bright, amazing office for a packed day of building. The city was burning outside, but the AC inside offered the perfect environment for developers to get creative. With only a day to ship big ideas, everyone got to work right away.

It feels special to be in one of the top AI hubs in Europe. London's AI scene is hot right now, with new companies getting built and plenty of people looking for places to experiment. Hackathons are good for that. You get a room, a deadline, and other builders around you.

SLNG Team

SLNG Team

Team

{Tech:Europe} London: what was shipped with in a day

TL;DR

  • We joined the London edition of the {Tech:Europe} hackathon, hosted at Attio.
  • 16 of the 27 teams built with SLNG
  • SLNG offered a special prize for the best team using our APIs to build a voice experience.
  • It was a chance to see what London builders are making with AI, agents, and voice.
  • The day was hot, busy, and full of strong demos.

SellFast - SLNG prize winner

Team: Vincent Hao, Billy Zhao

If you work with a sales team, you know how hard it can be to keep them up to date with all the cool things the product team is shipping. Sellfast is a continuous, gamified training flow that helps train your team on specific product areas based on previous customer calls stored in your CRM (Attio).

It plays out like a Pokémon gym — you meet different personas and ICPs, and you need to answer their questions and objections correctly to earn your badges. We loved the gamification, and how they gave personality to the voice agents. The team also won first place overall.

AutoCloser - SLNG prize runner up

Team: Plamen Dochev

We were really impressed by AutoCloser's end-to-end demo, it was so smooth. This solution is built on top of Attio CRM: it identifies stale and at-risk clients, automatically creates a campaign to call them using an SLNG voice agent, and schedules a meeting to re-engage with their account. We clearly saw the benefit teams would get from this type of solution.

A few more worth mentioning

We also want to give a shout out to Zakee and his project EchoChamber, which organizes Clubhouse-like conversations with avatars of public figures, letting them discuss topics together. A great way to make knowledge accessible.

And to the Flash team, who built a voice agent that joins your Google Meet meetings and listens to the conversation. Instead of just giving you a plain transcript, it organizes the conversation into a graph you can easily query with questions.

What we're noticing at hackathons right now

It's wild what people ship in a few hours. Coding agents help teams move faster and make demos look more polished, but the hard part hasn't changed much: you still need a strong idea, you still need to explain it clearly, and you still need a demo that works under pressure.

The best projects in London weren't just impressive technically, they had a clear user, a clear problem, and a reason for AI or voice to be there.

What's next

We left London with a lot of energy, we will definitely be back. Summer season is really starting, stay tuned for future events and let us know if you're organizing any.

Happy hacking!

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What people built at {Tech:Europe} Paris

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