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Simon Dziak - Founder & Lead Developer at App369
Founder & Lead Developer

Simon Dziak

Software engineer with 12+ years of hands-on development experience. Founder of App369, delivering 150+ mobile apps, web platforms, and enterprise software solutions.

Background

I started writing code at 14 and never stopped. After more than a decade of building software for startups and enterprises across healthcare, fintech, e-commerce, and education, I founded App369 in 2018 to help businesses turn ambitious ideas into production-ready applications.

My approach is hands-on. I still write code daily, review every architecture decision, and stay deeply involved in every project we deliver. I believe the best software comes from teams where leadership understands the technical details, not just the business strategy.

Based in South Florida, I work with clients across the United States and internationally, building mobile apps, web platforms, and custom software that drives real business outcomes. Our team has delivered over 150 projects with a 98% client satisfaction rate.

Areas of Expertise

Deep technical expertise across the full software development lifecycle.

Mobile Development

Cross-platform and native mobile apps for iOS and Android. Deep expertise in Flutter, Swift, and Kotlin with 100+ mobile apps shipped to the App Store and Google Play.

FlutterSwiftKotlinDart

Web Development

Full-stack web applications, SaaS platforms, and progressive web apps. Building performant, SEO-optimized web experiences with modern JavaScript frameworks.

Vue.jsNuxtReactTypeScript

Cloud & Backend

Scalable backend architectures, API design, and cloud infrastructure. Experience with real-time databases, serverless functions, and enterprise-grade deployments.

Node.jsFirebaseGoogle CloudPython

Industry Experience

Hands-on project leadership across high-regulation and high-growth verticals.

Healthcare

HIPAA-compliant patient portals, telehealth platforms, EHR integrations, and clinical workflow tools. Understanding of healthcare data regulations and interoperability standards including HL7/FHIR.

Fintech

Payment processing apps, digital banking platforms, investment portfolio tools, and insurance claims systems. Experience with PCI DSS compliance and financial data security.

E-Commerce

Custom storefronts, Shopify integrations, marketplace platforms, and mobile commerce apps. From product catalogs to checkout flows to inventory management.

Education

Learning management systems, student engagement platforms, virtual classroom tools, and EdTech SaaS products. Accessible, inclusive design for diverse learner populations.

Recent Articles

Insights on app development, technology strategy, and the software industry.

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Work with Me

Have a project in mind? I personally review every inquiry and respond within 2 business hours. Let's discuss your goals, technology options, and how App369 can help.