Moises Jonathan B.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Jul 16, 2026.

I’m a Senior Mobile & Full-Stack Developer (7 yrs) specializing in React Native, Flutter, Swift, FastAPI, and AI/LLM integrations. I build smooth, modern apps for meditation, wellness, healthcare, and travel, including AI journaling, breathwork flows, OCR scanning, mood tracking, and personalized recommendations. I handle full product delivery — mobile, backend, AI pipelines, cloud — and ship clean, reliable features fast. 🏭 Industries I Work In - Meditation & Mindfulness - Wellness & Mental Health - Healthcare & Patient Tracking - Travel & Lifestyle Apps - Fitness & Coaching Platforms - AI-Powered Mobile Tools 📱 What I Build - Smooth, cross-platform mobile apps (React Native / Expo / Flutter) - AI meditation & journaling features - Breathwork timers, animations, and routines - Healthcare flows: symptom logs, reminders, secure data sync - Travel assistants: itineraries, OCR scanning, translations - Full API backends (FastAPI, Node) - Admin dashboards & internal tools (Next.js) 🧠 AI Features I Build - GPT-based journaling + insights - Emotion/mood detection - Personalized meditation or travel recommendations - Image/PDF → structured data (Vision, OCR, embeddings) - Habit engines + behavior scoring logic - Recommender flows using embeddings + user history Tech Stack 1. Mobile Development - React Native (Expo + Bare Workflow) - React Native Vision Camera, Reanimated 3, Lottie - Zustand, Redux Toolkit, React Query (TanStack Query) - Flutter, Dart - Swift / SwiftUI for native iOS modules - iOS/Android In-App Purchases (StoreKit, RevenueCat) - Push Notifications + Deep Linking - Secure Storage, AsyncStorage, SQLite 2. Backend & APIs - FastAPI (Python), Node.js (Express, NestJS) - PostgreSQL, Prisma ORM - MongoDB, Redis, Celery - WebSockets, event workers, background tasks - Authentication: JWT, OAuth, social login 3. AI & ML - OpenAI (GPT-4o, GPT-5), Vision API, Whisper - LangChain, Pinecone vector DB - Embeddings pipelines (text + image) - Computer Vision: Image classification, object detection, facial recognition, OCR (Tesseract, AWS Textract), segmentation, pose estimation, and generative models (Stable Diffusion, DALL·E). Tools: TensorFlow, PyTorch, OpenCV, YOLO, Detectron2, Hugging Face Transformers, and custom model fine-tuning. - RAG workflows, reasoning logic - AI agents + multi-step chain logic ☁️ Cloud & DevOps - AWS: S3, CloudFront, Lambda, EC2, RDS, Route53 - Docker, Docker Compose - Terraform (IaC) - CI/CD with GitHub Actions - Monitoring, logging, performance tuning ❤️ Why Clients Love Working With Me - Calm communication style - Clear weekly roadmaps - Clean code + modular architecture - Pixel-perfect attention to UI - Deep understanding of wellness product psychology - Quick execution without cutting corners - I think like a product engineer, not just a coder - I care about your users, your vision, and your long-term scalability 👍 How I Work Calm communication, clean code, weekly updates, and I love helping founders take an idea → polished working mobile app quickly. I’m fast, reliable, and always focused on user experience. 🧠 Core Skills & Technologies Swift | SwiftUI | Kotlin | Java | Flutter | React Native | Dart | TypeScript | JavaScript | Node.js | Flask | FastAPI | Django REST | Firebase | Supabase | PostgreSQL | MongoDB | AWS | Google Cloud | Docker | GitHub Actions | TensorFlow | TensorFlow Lite | PyTorch | Core ML | OpenCV | HealthKit | Google Fit | LLaMA | GPT | Whisper | TTS/STT | ElevenLabs | Deepgram | LangChain | OpenAI API | Apple Pay | Google Pay | Stripe | REST API | GraphQL | CI/CD | Figma | Postman | HIPAA Compliance | Apple App Store | Google Play Console | Mobile App Development | iOS App Development | Android App Development | Flutter Development | React Native Development | Swift iOS Developer | Kotlin Android Developer | Native App Development | Cross-Platform Apps | Hybrid Mobile Apps | Custom Mobile Applications | MVP App Development | Firebase Integration | REST API Development | GraphQL API Development | Backend Development for Mobile Apps | Full Stack Mobile App Development | SaaS Mobile Apps | Real-Time Chat Apps | Video Calling & Conferencing Apps | AI Mobile Apps | Machine Learning Apps