Jura Brázdil
offline When I'm online, press to connect with me over voice — instantly.

Jura Brázdil

tech founder, engineer, designer, poet

Prague, Bohemia

Agents.md
Physics × Typography turning text into particles and back

A collection of scroll-driven text animations built with real physics — Langevin dynamics, curl noise particle systems, orbital mechanics, thermal simulations. Each experiment turns typography into a physical object that responds to forces.

voidchat p2p chatroulette clone

P2P voice-only chatroulette. Two strangers connect and talk — zero UI, just a black screen with a breathing liquid orb that distorts to audio. Built on WebRTC with Cloudflare Workers and Durable Objects for signaling.

koláčik custom strudel.cc replacement

Live coding music workbench built on top of strudel.cc. Multi-track mixer with real-time sync and audio-reactive curl noise particle visualization.

claudecraft claude dashboard with voiceovers

Global usage bar and reset times. Custom triggers for anything that could happen when chatting with Claude and unique character voiceovers for every conversation. Assigns characters to coding sessions and plays sound effects on hook events. Currently having a blast with a custom Warcraft 3 sound-pack.

In 2016 at the age of 22 I joined Michael Haase to build Plant Jammer. We helped people learn to cook with less meat and foodwaste. I figured out a way to pair ingredients by turning word2vec into a recommender engine, and built a greenfield backend from scratch. Eventually I grew into a CTO role and a co-founder. We scaled to 0.5M users across 5 apps, with SaaS clients like Miele, Dr. Oetker and Coop Sweden. We raised €4M, won the IBM Watson AI Prize and Apple Editor’s Choice, but failed on the business side.

I signed up for a PhD with the goal of studying the psychological impact of LLMs, but I didn’t meet likeminded people who’d take it seriously back in ’22. I noticed the disinterest and dropped out quickly. During that time I worked in a small team with Akimitsu Sano on his Moment project.

In my last job I built an agentic system to drive HR conversations. That’s 2 years spent on prompting, tools and RAG — and I’m still writing this text by hand.

At present I lead workshops on AI automation and build for fun. Recently I’ve built a P2P voice-only omegle clone, a skill-tree interface for modular video lectures, a physics-based text animation engine, or a voice-over and usage dashboard for Claude Code.

Apart from that I climb rocks, read about philosophy of mind and I write. A byproduct of the writing is a 10k Instagram community around my poetry.

Plant Jammer

CTO / Co-founder · 2016–22

Turned word2vec into a food recommender engine. Built the entire backend from zero — 0.5M end users across 5 apps, SaaS clients including Miele and Dr. Oetker. €4M raised, IBM Watson AI Prize 2018, Apple Editor’s Choice.

PythonDjangoPostgreSQLAWSword2vec

voidchat

Personal · Dec 2025

Voice-only chatroulette. Two strangers connect and talk — zero UI, just a black screen with a breathing liquid orb that distorts to audio. Zero-cost infrastructure on Cloudflare Workers and Durable Objects.

WebRTCCloudflare WorkersDurable ObjectsVanilla JS

text-animation

Personal · Mar 2026

Physics-driven text animations — Langevin dynamics, curl noise particle systems, Verlet integration, orbital mechanics. Each experiment turns typography into a physical object that responds to forces.

CanvasPhysicsVanilla JS

koláčik

Personal · Jan 2026

Live coding music workbench built on top of strudel.cc. Multi-track mixer with real-time sync and audio-reactive curl noise particle visualization.

AstroStrudelSQLiteWeb Audio

skilltrees

Personal · Dec 2025

Skill tree course platform. DAG-ordered video lectures with prerequisite tracking, rendered as an interactive node graph.

DjangoCytoscape.jsPython

trackpad

Personal · Feb 2026

iPhone as a Mac trackpad over USB. Gesture recognition, state machines, and CGEvent injection for native cursor control.

SwiftUIKitCGEvent

insomnia

Personal · Feb 2026

Passive API explorer. Captures HTTP traffic via Electron webRequest while you browse, with browser session transport and multi-provider auth.

ElectronNode.jsHTTP
2025 — now
FreelanceAI & Automation TeacherCertified Climbing Coach
2023 — 2025
get-ikigaiDeveloper, Agentic Systems
2022 — 2023
Reach TechTech Lead / Product
2022
CookpadSenior Software Engineer
2016 — 2022
Plant JammerCTO, Co-founder
2015 — 2016
Brázdil s.r.oFrontend, UI
2014 — 2016
Atollon CRMFullstack Developer
Education
MSc IT & Cognition University of Copenhagen
BSc Robotics & Cybernetics Czech Technical University, Prague