90 minutes of voice AI madness at our lightning hackathon

Last week, we tried a simple but intense hackathon format with the AI Engineer London community: A lightning fast voice AI hackathon. No warm up, presentations, or slides. Just 90 minutes to build something real.

60 developers arrived at Cloudflare's HQ in London, formed teams, and immediately started building. Judges were kept on their toes, circulating the room and watching demos as they came together. The vibes were chaotic, collaborative, and a ton of fun.

By the end of the evening, we saw over a dozen voice AI apps and awarded prizes to eight teams.

Here's what the community built.

Overall winner: EchoDiary by Anshul Yadav

EchoDiary took home the top prize with a real-time, voice-first emotional journaling companion. Rather than typing out feelings, users speak and the agent responds with empathy and understanding.

Runner-Up: OmniForm by Nathan Amin

OmniForm secured runner-up position with a voice agent that fills out web forms for you, live. The demo showed the agent navigating complex multi-step forms entirely via conversational UI.

Best Use of Cloudflare: Eliza Redux by Anup Jadhav

Inference Forge demonstrated exceptional use of Cloudflare's infrastructure to power their voice AI application. Eliza Redux is a real-time voice agent that provides crisis support through natural conversation, grounding techniques, safety assessments, and emergency service location.

Best Use of Deepgram: Quiz Master by Shrey Jain

Quiz Master showcased Deepgram's capabilities in a voice-powered quiz game that tests players' knowledge through natural conversation.

Best Use of ElevenLabs: Personal Tutor by Marcus Chen

Personal Tutor leveraged ElevenLabs' expressive voice synthesis to create an engaging educational companion that adapts its teaching style to individual learners.

Best Use of Layercode: VoiceNote AI by Sarah Kim

VoiceNote AI demonstrated creative use of Layercode's pipeline architecture to build a voice-first note-taking app with real-time transcription and summarization.

Honorable Mentions

Several other projects caught our attention with innovative approaches to voice AI problems.

---

A huge thank you to everyone who participated, our sponsors Cloudflare, Deepgram, and ElevenLabs, and the AI Engineer London community for making this event possible.

Interested in joining our next hackathon? Follow us on X to stay updated.