Apps peopleactually loveusing.
I design and build iOS & Android apps end-to-end — from the first sketch to the App Store. Obsessively crafted. Independently made.
Apps I've built
Products across web, native mobile, and desktop - each one built around a real workflow, not a demo prompt.
Limen
Web / iOS / Android / AI Audio
A ritual engine for psychological exploration with AI-generated structures, procedural audio, and a mobile-ready Capacitor release path.
ShiftSync
iOS / Android / Shared Web
A native shift calendar for rotating schedules with AI shift parsing, recovery-time blocking, and shareable web views for family coordination.
Dram
Web / iOS / Android / AI
A cocktail laboratory across web and native mobile for menu scanning, attempt logging, and triangulating the best version of a drink over time.
React Native / Expo / Capacitor / Electron
I build apps the
way I'd want to use them.
I'm Matthieu Decker, an independent developer based in the Pioneer Valley. I build across the full stack — React Native and Expo for mobile, Electron for desktop, NestJS and Supabase on the backend, and whatever frontend framework the project actually calls for.
My five shipped apps span a family operating system with real-time sync across four platforms, a procedural audio web experience driven by AI-generated rituals, a shift worker calendar with rotating pattern support, a cocktail lab built around a triangulation algorithm, and a poetry writing environment with a canvas physics engine. Each one is a production codebase I own end to end.
I WORK WITH
Apps Published
Independent
User-first always
I prototype interactions before writing a single line of code.
Obsessive iteration
Every release is better than the last. Changelogs read like love letters.
Transparent process
Clients see progress every week. No black boxes.
From idea to App Store
A clear, collaborative process — so you always know what happens next.
WEEK 1–2
Deep dive into the problem
We map out the user, the context, and the constraints. Research, competitive audit, defining success.
WEEK 2–4
Prototype before building
Figma flows, interaction prototypes, user testing. The UI is solved before code starts.
WEEK 4–10
Craft every detail
Clean, performant code. Daily builds. Weekly demos so you're never in the dark.
WEEK 10–12
Ship with confidence
App Store submission, reviews, launch strategy, and post-launch monitoring.
Have an app idea?
Let's talk about how we can bring it to life. Whether you're starting from scratch or need help refining an existing concept, I'd love to hear about it.
Tech Stack
The technologies and tools I use to build exceptional mobile experiences.
Mobile Development
Backend & Services
Design Tools
Your business runs on reputation. Your website should too.
Most local businesses do excellent work but have websites that do not show it. I build fast, mobile-first sites that match the quality of what you actually do.
No templates. No monthly retainers. Just focused work that gets done in weeks, not months.
Fast, focused work. No retainer required.
Mobile Refresh
A focused pass on mobile layout, performance, touch targets, and conversion friction so your existing site works the way local customers already use it.
Website Design & Build
Mobile-first websites built to match your reputation. Custom design, clean code, no templates, and a structure that supports the broader Pioneer Valley Web service packages.
Scoped App Feature Addition
Targeted implementation work for existing apps such as onboarding improvements, payment flows, dashboards, booking tools, or polish on a specific high-value feature.
App Redesign
UX and UI redesign work for existing apps that need a cleaner flow, stronger onboarding, and a more polished product feel without rebuilding everything from scratch.
App Design & Build
End-to-end app planning, interface design, and production build work for teams that need the product designed and shipped as one cohesive engagement.
Tell me about your business. I'll tell you what it needs.
I respond same-day to all inquiries. I'm local to Western MA, and the first conversation is always free. Let's talk about what your business needs and whether I'm the right fit.