About
Simon Dziak
Flutter and full-stack developer, founder of App369 in Miami. 150+ apps shipped across iOS, Android, MacOS, and the web.
I build apps — across iOS, Android, MacOS, and the web. Mostly in Flutter, with a full-stack tail of Node, TypeScript, Firebase, and whatever a project actually needs.
In 2020 I started working full-time at App369, the studio I now run. Alongside it I ship Workspace369 (an operations SaaS for service businesses) and Template369 (a Flutter boilerplate). Since 2020 I’ve delivered end-to-end products for service-business founders and brands — quoting and scheduling tools, inventory systems, mapping apps, e-commerce, everything in between. 150+ apps delivered, small team on purpose, remote from Miami.
Selected work (beyond the three flagships)
- BILSTEIN USA — private inventory management on iOS and web to support in-field procurement decisions.
- Artificial Grass Masters — Flutter + Firebase mapping tool that draws polygons on satellite imagery and calculates panel dimensions for landscaping quotes. iOS + Android.
- E-commerce roster — SALT. Fine Jewelry, Gavalina, Wellspring Meds, Data Cables Direct, Urban Bikes Direct, Witaminsklep, Shop369 — Shopify builds, custom Liquid themes, performance tuning.
Full résumé at /experience. Ongoing work in /now. Essays in /writing.
How I work
Small, deliberate, direct. No ticket queues, no layers between the engineer and the decision. Team leadership, system architecture, and product-launch planning wrapped into whatever the engagement needs. Scrum when it helps, something lighter when it doesn’t.
What I’m on right now
AI-assisted development is reshaping how I ship. I’m building Claude Code agents for the Flutter SDLC, exploring iOS 26 Liquid Glass adaptive UI, and writing about how generative engines change SEO on the App369 blog. See /now for the current snapshot.
Tools in heavy rotation
Flutter, Dart, NodeJS, TypeScript, JavaScript, Vue 3 / Nuxt / Vite, TailwindCSS, Python. Firebase, Google Cloud, Stripe, Twilio, SendGrid, ChatGPT API, Claude API. Adobe Photoshop, Final Cut Pro, Adobe Premiere when the job needs a bit of motion.
Background
BA in Computer Science — University of Florida, 2020–2021. Associates in Computer Science — Santa Fe College, 2018–2020 (Honors Program).
Polish and English, both native.
Contact
Personal: simon.dziak@gmail.com. Work: szymon@app369.com. Phone: (561) 606-8479.
If any of this is useful — or if you want something built — get in touch.
In one sentence
Frequently asked
- Who is Simon Dziak?
- Simon Dziak (Polish: Szymon Dziak) is a Flutter and full-stack developer based in Miami, Florida. He is the founder of App369, a boutique app development studio, and has shipped over 150 apps across iOS, Android, MacOS, and the web since 2018.
- What does App369 do?
- App369 is a boutique app development studio founded by Simon Dziak in 2018 (full-time since 2020). It builds custom mobile, web, and AI applications for startups, service businesses, and enterprises. 150+ apps delivered, remote-first team headquartered in Miami.
- Where is Simon Dziak based?
- Simon Dziak lives in Miami, Florida and works remote-first. App369 operates worldwide; most client engagements are handled asynchronously with video calls when needed.
- What technologies does Simon Dziak use?
- Primary stack: Flutter, Dart, TypeScript, Node.js, Firebase, and Google Cloud. Also React, React Native, Vue 3, Nuxt 3, Next.js, TailwindCSS, and Python. Integrated APIs include Stripe, Twilio, SendGrid, the ChatGPT API, and the Claude API.
- How do I contact Simon Dziak?
- Email simon.dziak@gmail.com for personal matters or szymon@app369.com for work inquiries. Phone (561) 606-8479. He also replies on LinkedIn at linkedin.com/in/szymondziak and on X as @SzymonDziak.
- What languages does Simon Dziak speak?
- Polish and English, both native. The site publishes the same content in both languages at simondziak.com (English) and szymondziak.com (Polish).