I'm Joakim Achren.
I founded a mobile games company, grew it, and exited to Netflix. After that I moved into angel investing, backing early-stage founders and learning what separates the companies that make it from the ones that don't.
Today I'm building again — but differently. I use AI to build mobile apps as a solo founder. No team of engineers. No months of hiring. Just clear thinking and an AI collaborator. My current project is SwoleAI, an AI-powered workout app built entirely with Claude Code.
What I'm doing now
I'm recording a free video course on building mobile apps with AI. It's concept-driven — not "follow along and copy this app," but "here's how to think about building anything." I share it with my Substack subscribers.
I'm writing Sleep Again, a book about sleep, energy, and decision-making for founders. Most advice on founder performance is shallow. This isn't.
I also publish free templates and tools for entrepreneurs — cap table spreadsheets, financial models, and planning frameworks. All built from real experience.
Why in public
I write on Substack because the best way to learn is to explain what you're doing. Building in public keeps me honest, and occasionally something I share turns out to be useful to someone else. That's enough.