Hire the Best App Developers in Istanbul, TR

With 5 years in Full-Stack Development, I craft powerful, user-centric web applications that elevate browser experiences. 🔥 Why Me? - Mastery over Next.js and Tailwind - Tailored Solutions for standout web applications. - Quality-First Approach ensuring seamless performance. - Transparent & Timely communication. - Your vision + My expertise = Apps that users love. Let's chat!

🏆 10+ Successful Projects | 100% 5-Star Reviews | $50K+ Earned | 35+ Apps Shipped 🏆 🤝 WHAT YOU GET ✅ Senior engineer with 8+ years of mobile & full-stack experience ✅ Every single completed project rated 5 stars by clients ✅ Custom UI/UX design by a professional designer (my wife) ✅ Free basic design support on every project ✅ 2 months of free post-launch support ✅ Unlimited revisions until you're satisfied ✅ Free consultation call before we start Industries I've delivered for: Healthcare, Fitness, E-commerce, Education, FinTech, Real Estate, Food Delivery, Travel, Social Media, SaaS, Lifestyle, News, and more. You need a developer who can build both your web platform AND your mobile app — without juggling separate teams, miscommunication, or doubled costs. I've delivered 35+ production-ready projects across iOS, Android, and web, and I handle the full stack so nothing falls through the cracks. I'm Mert, a senior full-stack engineer with 8+ years of experience. I work alongside my wife, a professional UI/UX designer, so you get world-class design AND rock-solid code from one team — faster turnaround, zero finger-pointing. 🚀 WHAT MAKES US DIFFERENT → Web + Mobile, One Team: Need a Next.js web app AND a React Native mobile app sharing the same backend? I architect and build the entire ecosystem. → Design + Development Under One Roof: My wife handles UI/UX design while I build the product — seamless collaboration from day one. → End-to-End Ownership: From wireframes to deployment and post-launch support, I own every step across all platforms. → Agile Sprints with Full Transparency: Weekly demos, daily updates when needed, and a shared project board so you always know where things stand. 💼 PROJECTS I EXCEL AT Full-stack web applications (Next.js, React, Node.js) Cross-platform mobile apps (React Native/Expo) Native iOS apps (Swift/SwiftUI) AI-powered web & mobile applications SaaS platforms with subscription billing MVP development for startups racing toward funding Admin dashboards & internal tools E-commerce, healthcare, fitness, fintech, education & lifestyle platforms API design, integration & migration projects ⚙️ TECHNICAL EXPERTISE 📱 Mobile Development: React Native, Expo, Swift, SwiftUI, Objective-C, Kotlin, Jetpack Compose, Xcode, Android Studio, App Clips, Widgets, WatchOS 🌐 Frontend & Web: Next.js, React, TypeScript, JavaScript, Tailwind CSS, HTML/CSS, Vue.js, Angular, Progressive Web Apps (PWA), Responsive Design, Server-Side Rendering (SSR), Static Site Generation (SSG) 🛠️ Backend & API: Node.js, Express.js, Python, PHP, Laravel, REST APIs, GraphQL, WebSockets, serverless functions, microservices architecture 🗄️ Database & Storage: Firebase (Auth, Firestore, Functions, Storage, Analytics), Supabase (Auth, Realtime, Edge Functions, Storage), PostgreSQL, MongoDB, MySQL, Redis, Prisma ORM 🤖 AI & Machine Learning: I've shipped production AI apps used by thousands — AI meal scanners, wardrobe stylists, child speech recognition systems, and more. I build AI that earns real revenue. → OpenAI, Claude & Gemini multi-model architectures → RAG pipelines & vector search (Pinecone, pgvector) → Voice AI: Speech-to-Text → LLM → Text-to-Speech → AI image analysis, OCR & document parsing → Personalized recommendation engines → Subscription-gated AI features & usage-based billing → Real-time AI streaming responses (SSE) → AI chatbots with memory & context management → Automated content generation pipelines → AI-powered search & semantic similarity → Fine-tuned model integration & prompt engineering → Multi-language AI (11+ languages shipped) → On-device ML (CoreML, MLKit, TensorFlow Lite) 💰 Monetization & Payments: RevenueCat (subscriptions & paywalls), StoreKit 2, In-App Purchases, Stripe (payments, subscriptions, Connect), Apple Pay, Google Pay, payment gateway integration 🔔 Engagement & Growth: Push notifications (FCM, APNs), deep linking, App Store Optimization (ASO), Apple Search Ads, SEO, analytics (Mixpanel, Firebase Analytics, Amplitude, Google Analytics), A/B testing, onboarding flows 🔐 Security & Auth: OAuth 2.0, SSO, biometric authentication (Face ID, Touch ID), JWT, secure data storage (Keychain, encrypted preferences), role-based access control, CORS, rate limiting, input sanitization 🧪 Testing & DevOps: XCUITest, Jest, Detox, Cypress, unit & integration testing, CI/CD (GitHub Actions, Jenkins, Fastlane, Vercel), TestFlight, CodePush (OTA updates), Docker, crash reporting (Sentry, Crashlytics) 📍 Location & Real-Time: Geofencing, MapKit, Google Maps SDK, location-based services, real-time chat & messaging, WebSocket connections, live data sync 🔗 Third-Party Integrations: Social media login & sharing, Twilio (SMS/voice), SendGrid, Cloudinary, AWS (S3, Lambda, Amplify, EC2), Google Cloud, Vercel, Netlify, REST/GraphQL API design & consumption Ready to build something great? Send me a message — let's talk about your project.

Hello, I’m Duygu — a Senior Project Manager with 400+ Upwork hours, 85% Job Success, and a proven track record in digital transformation, operations, and cross-functional project management. What I bring: 7+ years of experience managing Agile and hybrid projects across marketing, technology, and operations. Strong expertise in leading remote teams, vendor management, and process optimization. Skilled in Jira, Asana, Trello, and Monday.com for clear task tracking and communication. How I work: I focus on transparency, efficiency, and measurable results. I provide proactive risk management, budget control, and structured reporting so clients always know exactly where their project stands. Client Value: ✔ Projects delivered on time and within budget ✔ Optimized workflows that save costs and reduce risks ✔ Clear communication and reliable collaboration Let’s connect to discuss your goals and how I can help your project succeed! ------------------------------------------------------------------------------------------------------------------------ Working with teams from different timezones effectively Agile Project Manager Product manager Meistertask Monday.com ClickUp Jira Slack Teamwork Analytical thinking Flexible working hours Communication Vendor Management Change Management IT Project & Program Management Pharmaceutical Project Management Digital Project Management Consulting Digital Transformation Market Research Business Process Improvement Microsoft Office Cross-functional Team Leadership Microsoft Products Management English German Delivery Management People Management Product Management Digital Strategy