The DeveloperMeet the Developer Behind App369
App369 is founder-led: every project is built by a senior developer who has shipped and maintains production apps in mobile, web, and AI.
Simon Dziak
Founder & Lead Developer
Simon founded App369 with a mission to build technology that drives real business results. He builds every client project himself and also built and runs Workspace369, a production Flutter and Firebase platform with a native iOS app.
His technical expertise spans Flutter, Swift, Kotlin, Vue.js, Node.js, Firebase, and Google Cloud Platform. He specializes in translating complex business requirements into clean, scalable architecture.
He works in writing, at fixed prices, and you keep the code. Small jobs have one published price; bigger builds start with a $450 written scope that turns into one fixed quote.
Core Expertise
- Flutter
- Swift
- Kotlin
- Vue.js
- Node.js
- Firebase
- Google Cloud
- TypeScript
- React
- UI/UX Design
- System Architecture
- AI Integration
Writing
Recent articles by Simon
Insights on app development, technology trends, and building successful software products.
AI & Technology
AI Search Visibility Audit: What It Checks and Costs
What a good AI search visibility audit checks, the red flags to avoid, what GEO audits cost in 2026, and a DIY checklist you can run yourself this week.
Read more →AI & Technology
Hire Someone to Finish Your Vibe-Coded App (2026)
Lovable, Bolt, Cursor, Replit or v0 app mostly built? Compare freelancer, agency, builder partner and fixed price on cost and risk, plus 10 questions to ask before you hire.
Read more →AI & Technology
How to Show Up in Google AI Overviews (2026)
What Google says it takes to be cited in AI Overviews and AI Mode: no special markup, snippet eligibility, snippet controls, Google-Extended and reporting.
Read more →AI & Technology
Supabase Security Review Before Launch (2026)
What to check in a Supabase project before launch: keys, Row Level Security, views, storage, Edge Functions, auth email and backups, with a fix-first order.
Read more →AI & Technology
v0 App Rescue: 8 Problems to Fix Before Launch
Your v0 app runs on Vercel with data in Supabase or Neon. The 8 problems to check before launch, from the React2Shell patch to exposed keys and rollbacks.
Read more →AI & Technology
Base44 App Rescue: 8 Problems to Fix Before Launch
Your Base44 app works in the editor, but real users are coming. The 8 problems to check first, from open sign-up and data rules to backend functions.
Read more →Start here
Work with Simon
Simon builds every App369 project himself. Send your project details, or book a consultation ($100 per 15 minutes, paid upfront) to talk it through with him.