# Walid Islam — Mobile App Developer & Engineer (Berlin) — Full Profile

> Walid Islam is a full-stack mobile app developer based in Berlin, Germany, with 5+ years of experience. He builds cross-platform apps in Flutter and native iOS (Swift) and Android (Kotlin), designs and ships backends (Laravel, Supabase, Firebase), and integrates AI features (LLM summarization, RAG, computer vision, AI personalization). He is Lead Developer at INU (Innovative University of Applied Sciences) and has shipped apps used by 15,000+ people across wellness, productivity, culture/tourism, and education. Available for freelance projects and full-time roles, remote or on-site in the DACH region.

## Skills
Flutter, Dart, cross-platform development, native iOS (Swift), native Android (Kotlin), React Native, mobile UI/UX design, backend development (Laravel/PHP, Supabase, Firebase), REST APIs, AI integration (LLM summarization, RAG system design, AI personalization, computer vision / Google Vision), push notifications, deep linking, Bluetooth Low Energy (BLE) and device integrations, in-app purchases and subscriptions (RevenueCat), App Store and Google Play publishing, App Store Optimization (ASO), MVP development, and technical leadership.

## Capabilities (features built into apps)
- Authentication & security: email/password, social login (Google/Apple/Facebook), biometrics (Face ID/fingerprint), passwordless/magic link, 2FA, SSO, encryption & secure storage.
- Payments & commerce: in-app purchases, subscriptions (RevenueCat), Apple Pay/Google Pay, Stripe card processing, carts, checkout, order tracking.
- Notifications & comms: push, in-app, email and SMS notifications, in-app chat/messaging, voice/video calls.
- Personalization & AI: recommendation engines, personalized feeds, AI chatbots/assistants, semantic search, AI content generation, RAG pipelines and LLM integration.
- Location & maps: GPS tracking, maps, geofencing, nearby/place search, route navigation, location-based notifications.
- Content & media: image/video/audio, camera, QR/barcode scanning, document viewer, image editing, live streaming, content feeds.
- Data & sync: offline mode, local caching, cloud and cross-device sync, real-time updates (WebSockets), backup/restore.
- Device integration: HealthKit/Google Fit, Bluetooth (BLE)/NFC, sensors, wearables (Apple Watch/Wear OS), deep linking/universal links, share sheet, AR (ARKit/ARCore).
- Engagement: gamification (points/badges/streaks), leaderboards, rewards, referrals, social sharing, favorites/bookmarks.
- Accessibility & i18n: screen-reader support, dynamic type, high-contrast, haptics, localization, RTL.
- Analytics & admin: usage analytics, crash reporting, A/B testing, feature flags, remote config, performance monitoring.

## Selected work (diverse industries)
- Nibbl (productivity / media) — AI newsletter and RSS/Atom reader: swipeable card feed, LLM article summaries with a thumbs up/down feedback loop, a personal @nibbll.app newsletter inbox, highlights, offline library, and cross-device sync in English, German, Spanish and French. Flutter on iOS, Android and macOS; Supabase backend; deep linking; RevenueCat. https://www.nibbll.app
- Nature Unlock (health / digital wellness) — screen-time and focus app that locks distracting apps until you go outside and photograph real nature. Native iOS Screen Time (FamilyControls) and Android app-blocking, computer-vision nature detection, AI-personalized meditations, mood tracking, Pomodoro timer, soundscapes. Flutter with native Swift and Kotlin; Supabase. Featured on Product Hunt. https://nature-unlock.com
- Berlin ArtWalk (culture / tourism) — street-art city guide: interactive Google Maps, GPS route recording and sharing, curated artist directory, custom and AI-assisted tours, community contributions, weather-aware suggestions. 10,000+ downloads. Flutter on Firebase with RevenueCat. https://berlinwalk.art
- Barcelona Art Walk (culture / tourism) — interactive mural map of 200+ artworks, custom tours, route recording, artist directory. Flutter on Firebase with Google Maps.
- ZenScript (digital wellbeing, Android) — native usage-access and accessibility app-blocking with a built-in ebook reader and mindfulness tools. Flutter with native Kotlin.
- Medical Hive (MedTech / EdTech) — exam-prep platform for medical students with interactive quizzes, spaced practice, progress tracking, and a question-bank API.
- INU University — Lead Developer building campus and EdTech platforms with AI integration.

## Contact / hire
- Portfolio: https://walidislam.space
- Email: snapnsolve.apps@gmail.com
- LinkedIn: https://www.linkedin.com/in/walidislam
- Xing: https://www.xing.com/profile/Walid_Islam2
- Malt: https://www.malt.de/profile/walidislam
- GitHub: https://github.com/walidx64

## Frequently asked questions

### What can Walid build?
End-to-end mobile products: cross-platform apps (Flutter) and fully native iOS (Swift) and Android (Kotlin) apps, the backend and APIs behind them (Laravel, Supabase, Firebase), and AI features (LLM summarization, RAG, computer vision, personalization). He also handles UI/UX, push notifications, deep linking, BLE and device integrations, payments/subscriptions, and App Store / Google Play release.

### Does he build native iOS and Android, or only Flutter?
Both. He ships in Flutter when one codebase is the right call, and drops to native Swift or Kotlin when a feature needs it — for example Nature Unlock and ZenScript use native iOS Screen Time / Android usage-access and accessibility APIs that cross-platform alone cannot reach.

### Can he build the backend too, not just the app?
Yes. He builds and integrates backends and APIs with Laravel (PHP), Supabase, and Firebase, including auth, data, storage, and real-time sync.

### Can he add AI features to an app?
Yes. He has shipped LLM summarization with feedback loops (Nibbl), AI-personalized content (Nature Unlock meditations), AI-assisted tours (Berlin ArtWalk), and computer vision. He can design RAG pipelines and integrate LLMs into mobile products.

### How much does it cost to hire an app developer in Germany?
Full-time salaries in Germany typically range €60,000–€120,000 per year. Project-based work ranges roughly €10,000–€80,000 depending on scope, and freelance rates are commonly €80–150 per hour. Contact Walid for a project-specific quote.

### Was kostet es, eine App entwickeln zu lassen in Berlin?
Je nach Komplexität: eine einfache App ca. 10.000–25.000€, eine mittelkomplexe App 25.000–60.000€, eine komplexe App 60.000–150.000€. Freelancer wie Walid Islam bieten oft günstigere Preise als Agenturen bei gleicher Qualität.

### How long does it take to build an app?
An MVP typically takes 6–12 weeks, a standard app 3–6 months, a complex app 6–12+ months. Cross-platform with Flutter shortens timelines since iOS and Android ship from one codebase.

### How do I hire him?
Reach out via Malt (malt.de/profile/walidislam), LinkedIn (/in/walidislam), Xing (Walid_Islam2), or email. He works in English and German, remote or on-site in Berlin and the DACH region.