Mateusz
Byrtus
For opportunities and collaborations, reach me at
mateusz.byrtus@icloud.com
By day, Product Owner at Assembly Global. By night, I make small, AI-powered tools and apps — bridging product strategy and rapid engineering.
In the past year I've shipped native iOS apps, a full-stack SaaS product, and AI-powered publishing tools. Luma Breathwork reached a 13.3% App Store conversion rate, AuraSeason is live on the App Store, and Daily Word turns a daily ritual into a full pipeline.
I'm a builder with a growing focus on where product strategy meets craft.
I've found that shipping real things — small, focused, and fast — is what teaches me the most. So I keep the loop tight: spot a real problem, design a lean MVP, build with a modern stack, and iterate on data.
Outside of work I create origami, play basketball, tennis, and chess — the same quiet obsession with structure and play, in a different medium.
EPUB and PDF files into narrated audiobooks — chapter review, voice profiles, resumable rendering.
A native iOS utility visualising seasons, years, and personal milestones across widgets and Live Activities.
A dark editorial magazine on discipline and stoicism — WebGL shaders, cinematic scroll, built solo in two weeks.
A breathwork app for iPhone and Apple Watch with Health integrations, richer stats, and stronger haptics.
Polish daily readings — scraping, AI summaries, generated visuals and newsletter delivery in one calm experience.
Turns raw app screenshots into ready-to-use App Store visuals, marketing copy and landing pages.
Emotion tracking for iOS with weekly AI summaries — idea to App Store in one week.
A minimal box-breathing experience built in two weeks to explore focused UI and StoreKit paywalls.
Multi-agent Jira copilot for product operations, research, and grounded execution.
“Incredible app. Simple, clean, and gets straight to the point. The Apple Watch integration is flawless and it actually helps me calm down during busy workdays.”