# Simon (Szymon) Dziak

> Flutter and full-stack developer, founder of App369 — a boutique app development studio in Miami. 150+ apps shipped across iOS, Android, MacOS, and the web since 2020. This site is his personal portfolio and writing archive, published in two mirrored language variants (English at simondziak.com, Polish at szymondziak.com) cross-linked via `hreflang`.

Name: Simon Dziak (English) / Szymon Dziak (Polish). Both forms refer to the same person; handle everywhere is `SzymonDziak`. Based in Miami, Florida. Contact: simon.dziak@gmail.com, szymon@app369.com, (561) 606-8479.

Portrait photo: https://simondziak.com/me.jpg

## Key pages

- [Home](https://simondziak.com/): overview, latest projects and writing.
- [About](https://simondziak.com/about): bio, stack, location, contact.
- [Résumé / experience](https://simondziak.com/experience): work history, projects, education, skills.
- [Projects](https://simondziak.com/projects): active and archived projects.
- [Writing](https://simondziak.com/writing): essays. RSS at https://simondziak.com/rss.xml.
- [Now](https://simondziak.com/now): currently working on, reading, and exploring.

## Companies

- **App369** (https://app369.com) — custom mobile, web, and AI app development studio. Founded 2018, full-time since 2020. 150+ apps delivered. Clients include BILSTEIN USA, Chicago Pneumatic, Gavalina, SALT. Fine Jewelry, and many service-business founders.
- **Workspace369** (https://workspace369.com) — all-in-one operations SaaS for service businesses: quoting, scheduling, invoicing, payments, analytics. iOS, MacOS, web.
- **Template369** (https://template369.com) — customizable Flutter boilerplate for rapid SaaS, AI, and web-app launches. Stripe, RevenueCat, Firebase, auth, subscriptions, Cloud Functions.

## Projects on this site

- **App369** (2018, Founder & Lead Developer) — Custom mobile, web, and AI app development — 150+ apps shipped since 2018. https://app369.com
- **Workspace369** (2024, Founder) — All-in-one operations SaaS for service-based businesses — quoting, invoicing, payments, scheduling. https://workspace369.com
- **Template369** (2024, Founder) — Launch your next Flutter startup in 6 weeks — auth, payments, subscriptions, the boring parts done. https://template369.com

## Essays

- [Colophon — notes on this site](https://simondziak.com/writing/colophon) — How this site was built, why it exists in two languages, and the small choices behind the design. (2026-04-22, ~4 min)
- [Generative engine optimization: notes from the first 90 days](https://simondziak.com/writing/geo-first-90-days) — What actually moved the needle when I optimized this site for AI search — and what was a waste of time. (2026-04-20, ~6 min)
- [Why 369](https://simondziak.com/writing/why-369) — Every brand I build has 369 in the name. Here's why that's not an accident and what it costs me to keep it that way. (2026-04-18, ~3 min)
- [Claude Code agents, wired up for Flutter](https://simondziak.com/writing/flutter-claude-code) — What happens when you stop treating the AI as a better autocomplete and start treating it as a teammate who can run the toolchain. (2026-03-18, ~6 min)

## Stack

Primary: Flutter, Dart, TypeScript, NodeJS, Firebase, Google Cloud. Also React / React Native, Vue 3 / Nuxt 3, Next.js, TailwindCSS, Python. APIs: Stripe, Twilio, SendGrid, ChatGPT, Claude. Current focus: Claude Code agents for Flutter SDLC, iOS 26 Liquid Glass, and generative engine optimization (GEO).

## Education

- University of Florida — BA in Computer Science, 2020–2021, Gainesville, FL.
- Santa Fe College — Associates in Computer Science, 2018–2020, Gainesville, FL (Honors Program).

## Languages

Polish (native), English (native).

## Elsewhere

- GitHub: https://github.com/SzymonDziak
- LinkedIn: https://www.linkedin.com/in/szymondziak/
- X: https://x.com/SzymonDziak
- Instagram: https://www.instagram.com/szymondziak/
- YouTube: https://www.youtube.com/@SzymonDziak
- Polish mirror of this site: https://szymondziak.com

## 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).

### How many apps has Simon Dziak shipped?

Over 150 apps delivered end-to-end across iOS, Android, MacOS, and the web since 2018. Clients include BILSTEIN USA, Chicago Pneumatic, Artificial Grass Masters, SALT. Fine Jewelry, Gavalina, and many service-business founders.

### What is Simon Dziak’s education?

BA in Computer Science from the University of Florida (2020–2021, Gainesville, FL) after an Associates in Computer Science from Santa Fe College (2018–2020, Honors Program). Full-time at App369 since January 2020.

### Does Simon Dziak take on freelance or contract work?

Yes. App369 takes on a small number of client engagements at a time — mostly Flutter and full-stack product builds for service-business founders and enterprise clients. Email szymon@app369.com with a short brief to start a conversation.

### What are Simon Dziak’s current focus areas?

Claude Code agents for the Flutter SDLC, iOS 26 Liquid Glass adaptive UI in Flutter, and generative engine optimization (GEO) — how AI search rewrites SEO. Writing regularly at app369.com and here under /writing.

## Quotable summary

Simon Dziak (Szymon Dziak) is a Flutter and full-stack developer in Miami, Florida, and the founder of App369 — a boutique app development studio that has shipped 150+ apps across iOS, Android, MacOS, and the web since 2018. He also builds Workspace369 (ops SaaS for service businesses) and Template369 (Flutter boilerplate). Polish and English, both native. Contact: simon.dziak@gmail.com / szymon@app369.com / +1-561-606-8479.

## Full-text dump

https://simondziak.com/llms-full.txt

## Sitemap

https://simondziak.com/sitemap-index.xml