Building Sunny Coffee: finding sunny Paris terraces in real time
A long weekend hack with Claude Code to scratch a decade-old itch and answer one question: where in Paris can we drink coffee in the sun right now?
Paul Baron — Writing
Thoughts on AI, product, UX, and building things that matter.
Latest posts
Personal Software to Stay Healthy — Part 2
I built a small app to prompt hourly movement breaks at my desk. I used it intensely, then stopped. A reflection on personal software that does its job by becoming unnecessary.
Personal Software to Stay Healthy — Part 1
Why I built my own fitness dashboard, made it public, and what it says about data ownership.
What Miso Taught Claude Code's Creator
Three AI leaders who spent time in Japan came back thinking differently about building technology. On patience, stillness, and deeper thinking.
The Missing Recap in AI Chat Projects
AI chat tools like Claude and ChatGPT drop you into long threads with zero context. A simple recap and contextual restart options could change everything.
Vibe Coding for Beginners — LinkedIn Live
Watch the recording of the first What is Vibe Coding session with Jose Rosa on LinkedIn Live — a hands-on intro to building apps with AI tools like Lovable.
Part 1 — The AI's Blank Box Trap
Multi-agent AI is transforming engineering, but consumers still face a blank chat box. Why pre-made AI specialists — not prompts — are the key to mass adoption.
Have You Tried Vibe Coding Yet?
I've had a lot of fun building apps with Lovable in 2025 — from full-fledged products to simple tools. Let me help you get started.
The Moat Isn't a Dashboard
Most longevity protocols have a longevity problem: an over-optimized check-up, but little-to-no guidance for the 360 days after.
Hourly Movement Breaks for Everyone
A tiny web app that pings you each hour for a 5-minute movement break with 100+ simple exercises — happening simultaneously around the world. Try hmove.live.
Flexbase's AI Athlete Agent
An AI agent built into Flexbase that tracks your favorite pro athletes' results daily and pings you with updates — powered by PPLX API with validation and fact-checking.
Enforce the Minimum Viable Fix
Vibe-coding rule: kill bloat, be ruthless with the overeager AI copilot, and ship the smallest change that solves the bug.
The Flexbase Launch Story
From a simple athlete profile page for my son to a full web platform — built with Lovable, and one of the most exciting experiences of my career.
Can We Vibe-Code Our Way to Happiness?
I vibe-coded a daily gratitude micro-journaling app with Lovable's AI — without writing a single line of code.
I Invented Facebook (Sort Of)
I found proof in my archives that I invented Facebook 4 years before Mark. Here's the first design of 'myGroupNews' from December 2000.
Making AI Interactions Feel Natural
How ChatGPT's Advanced Voice Mode UI — a painting-like animated dot — shapes not only how we use AI but how we embrace it.
From Tool to Agent to AI Colleague
Exploring the benefits of AI-powered collaborative platforms where teams work alongside an AI as a standalone colleague.
An AI Index Label for Digital Content
Imagine a label that reveals how content was created: AI-generated, human-created, or somewhere in between.
Is This AI's GUI Moment?
The evolution of AI interfaces from chat boxes to interactive visual tools may remind us of the shift from CLI to GUI almost 40 years ago.
Push/Pull AI Dynamics
In the future, AI will need to strike a balance — knowing when to offer help and when to step back and let users take control.
The AI Email Inbox of the Future
No list of emails, no inbox, no spam. Just a few topics brought to my attention as a recap throughout the day.
Skip the AI Agent Curation Stage
I wish we could skip the 'AI agent curation' and 'search engines for AI agents' stages, and go back to the simplicity of just asking.
On and Off Stage — 2023 in Review
Leading high-impact initiatives at HelloBetter while planning a family move from Berlin to Geneva.
Dadditude in The Wall Street Journal
We talked with Julie Jargon at The Wall Street Journal about our work supporting dads with Dadditude.
Dads In Tech Interview
A conversation about parenting philosophy and running Dadditude for Tiang Lim Foo's Dads In Tech newsletter.
Dadditude V1 Sneak Peek
One year in, 16,000 followers and nearly as many downloads — we're just about ready to launch our Dadditude app V1.
Dadditude Proof of Concept Ratings
151 ratings (4.8⭐️ avg.) and 22 kind reviews in the app stores — great motivation as we prepare to launch V1.
Dadditude Community Tips Growing
Two months after launch, our Community Tips section keeps growing. Dads look out for each other.
Leaving Sonos — 8 Things I Loved
After 3 years at Snips and post-acquisition at Sonos, my time is up. Here are 8 things I loved.
Sonos Acquires Snips
From co-founder to employee, from expert to n00b — what a ride learning about neural networks and private-by-design voice recognition.
I Want a Coach in my Banking App
A good running app can coach you to a marathon finish line. So why can't my banking app help me reach my financial goals?
Imprecise, Impatient, Incomplete or Wrong — Designing Apps for Kids
My 5 year old boy loves playing and learning on my iPad. Observing him taught me a great deal about app accessibility for kids.