Deniz Utku B.

I built Swift Alert solo, from the first line of code to 850,000+ daily active users, 2M+ downloads across two apps, a US App Store top-10 ranking and a 4.9★ rating from 90,000+ reviews. That's the kind of ownership I bring to every project. I'm a Senior Mobile & Product Engineer (React Native, Expo, Swift) with 4+ years of shipping production apps on iOS, Android, web and backend. I work directly with founders on product, UX and roadmap decisions, not just tickets. WHAT I'VE SHIPPED • Swift Alert & Sabrinalert: CTO and sole engineer. Real-time alert apps at massive scale, with push delivery, infrastructure costs and performance tuned for traffic spikes. • GetRegistered: Lead Mobile Engineer for 4 React Native apps. I built GR Leads and GetRegistered from scratch, plus an internal app running on 30 iPads with scanning and Bluetooth printer integration. I own CI/CD (EAS, GitLab CI), store releases, Sentry, and Rails backend work. • Altar: rebuilt a social prayer app on modern React Native + Firebase, launched it on Android for the first time, cut load times by 40%, and shipped a full UI/UX redesign with new onboarding. • Aside Actor: an AI rehearsal app for actors. An LLM pipeline (OpenAI, Claude) parses scripts, TTS (ElevenLabs) voices the other roles, and real-time speech recognition runs on custom native iOS modules (Expo Modules, AVFoundation). • Healthcare: founding engineer of Pooficient (pediatric family–clinic app on Supabase). I also launched Endor Health's Android app, growing its user base by 20%. • 🏆 Apple Swift Student Challenge 2023 Winner (SwiftUI) HOW I CAN HELP • Building your MVP or v1 from zero to the App Store and Google Play • Rescuing, modernizing or speeding up an existing React Native app • Adding AI features: LLMs, structured outputs, RAG, TTS/STT • Native modules when libraries fall short, plus push notifications, in-app purchases and deep linking • Releases, CI/CD, monitoring and long-term maintenance I use AI-assisted development (Claude Code, Cursor) every day, so I move fast without cutting corners. Most of my clients are early-stage startups, and I genuinely enjoy that pace. STACK React Native · Expo · TypeScript · Swift/SwiftUI · Kotlin · React · Next.js · Node.js · Rails · Django · Firebase · Supabase · PostgreSQL · OpenAI · Claude API · ElevenLabs · EAS · Detox · Maestro Have an app idea or an app that needs fixing? Send me a message and let's talk.