This weekend, Team Tihado joined the {Tech: Europe} Paris AI Hackathon in Paris for a full day of building, testing, pitching, and turning an idea into a working demo.
We are proud to share that Lumen won 3rd place overall and received the SLNG// sponsor award.
Meet Lumen
Lumen is a voice-first AI lesson authoring app that helps teachers turn a spoken or typed lesson idea into a structured, editable lesson canvas.
Instead of starting from a blank document, teachers can speak naturally, then refine the generated lesson into objectives, explanations, activities, quizzes, citations, media, narration, and rehearsal support.
Voice-first authoring
Teachers can describe a lesson out loud and watch it become a structured canvas.
Built for classroom prep
Lumen turns rough ideas into editable teaching material with objectives, activities, quizzes, and citations.
From idea to pitch
Hackathons compress product work into a sharp feedback loop. The team had to decide what mattered, build the core interaction, test the flow, and pitch clearly enough for people to understand both the product and the problem it solves.
For Lumen, that meant focusing on the moment where a teacher moves from an idea in their head to a lesson they can actually use. Voice made that flow feel natural: speak the intent, get a first structure, then edit and polish.
The demo
The live demo showed Lumen turning a lesson idea into a usable canvas with planning, media, and preview support. It was designed to feel calm and practical: less like a generic chatbot, more like a workspace where teachers can shape material they trust.
Explore Lumen
Lumen is live and open source. Try the demo, inspect the implementation, and follow along as we keep building.
Product page
Want the product breakdown, architecture, and teacher workflow in one place?
What we learned
Winning mattered, but the best part of the day was the feedback. The conversations around voice AI, lesson planning, classroom workflow, and how teachers might actually use a tool like Lumen gave us sharper direction than a trophy alone could.
The SLNG// sponsor award pushed us to think more deeply about voice as an interface. Not just voice as input, but voice as a faster way to capture intent, rehearse ideas, and move from preparation to delivery.
Thank you
A huge thanks to Job Vernik, Bela Wiertz, and the Hexa team for creating a builder-focused event, and to SLNG and Nicolas Grenie for the sponsor award, thoughtful feedback, and conversations around voice AI.
Thank you as well to the sponsors and partners who made the day possible: OpenAI, Gradium, fal, Pioneer AI by Fastino Labs, Tavily, and SLNG.
The Team
Lumen was built by Team Tihado: Viet Tien Ngoc, Hanh Thi-Hong Tran, Tan Nhat Linh LE, and Phuong Nhi Chau.
Phuong Nhi Chau
Hanh Thi-Hong Tran
Tien Ngoc Viet
Tan Nhat Linh LEThis is only the beginning.
Tihado - Building in public.