Mateusz. Full-stack developer who ships, on time, every project.
I'm the developer behind MefjuDev LLC. For the past 8+ years I've built custom websites, native iOS and Android apps, and cross-platform products for clients across the US, Europe, and Asia. Every line of code is mine: no agencies, no outsourcing, no handoffs to junior devs.
My work spans early-stage MVPs, production apps with real paying users, and full platform builds covering web and mobile. Whether you need a marketing site that loads in under a second or a native iOS app with Stripe-integrated subscriptions, I've shipped it before.
How MefjuDev started
What started as shipping small iOS projects over eight years ago grew into full-time freelance work across web and mobile, and eventually into MefjuDev LLC, so clients get contracts, clear scopes, and reliable delivery. Today I work with startups, founders, and small businesses across the US, Europe, and Asia, remote-first from the Philippines, overlapping US mornings and European afternoons.
Full-stack coverage, solo execution
Custom Web Development
Production websites and web apps built with React, Next.js, and TypeScript: fast, SEO-ready, and deployed on Vercel.
Native iOS Development
iPhone and iPad apps written in Swift and SwiftUI. Shipped 18+ apps to the App Store with real paying users.
Native Android Development
Android apps built in Kotlin with Jetpack Compose, following Material 3 guidelines and modern architecture.
Cross-Platform Apps
One codebase, two app stores. Flutter and React Native builds for projects that need iOS and Android simultaneously.
Backend & APIs
Node.js APIs with authentication, payments, and real-time data. Supabase or Firebase when it fits, custom when it matters.
Maintenance & Iteration
Already launched? I handle updates, new features, bug fixes, and App Store resubmissions so your product keeps moving.
Tools I use to ship production software
Web
- React
- Next.js
- TypeScript
- Node.js
- Tailwind CSS
- PostgreSQL
Native iOS
- Swift
- SwiftUI
- Core Data
- StoreKit
- WebKit
Native Android
- Kotlin
- Jetpack Compose
- Room
- Material 3
Cross-Platform
- Flutter
- Dart
- React Native
- Expo
Backend & APIs
- Node.js
- Express
- Supabase
- Firebase
- Stripe
- REST
Tooling & DevOps
- Git
- GitHub Actions
- Vercel
- Xcode Cloud
- Figma
Have a project in mind?
Tell me what you're building. I'll review your project, reply within 24 hours with my thoughts, and if it's a fit, we'll map out next steps together.