Hire the Best Windows App Developers in California

From full stack web development to cross-platform desktop applications, I will deliver an application from start to finish, or bring your existing website/application up to date. I deliver on time, and to spec with communication being key. Yes, I can interface your website, web app, or desktop with the LLM AI API of your choice. ChatGPT, Claude, Mistral, whichever ones you want. You ask, "why should I choose you for my project?" ✅ I work with clients with the intention on having you want to work with me in the future. ✅ This means that I go above and beyond when I sign on to your project. ✅ I primarily work with clients in or near my timezone because communication is important to me. ✅ What this means is, you will be included in every part of the process, ensuring your satisfaction. ✅ If you aren't tech-oriented, that's okay! I can speak your language, and together we can make sure you get the finished product that you deserve. My Services Include: 🖥️ Frontend Development: Typescript Javascript React.js Semantic HTML 5 CSS 3 Bootstrap Tailwind Next.js jQuery Angular ⚙️ Backend Development: Node.js MySQL Postgres Sequelize Firebase Firestore/Realtime Database MongoDB Mongoose Bash + Python scripts GraphQL 💾 Cross-platform Desktop applications: Electron.js Qt 🦾 Embedded: C/C++ Arduino Espressif ESP32 and ESP8266 8-bit Atmel Atmel ARM Internet-of-things Raspberry Pi 🔧 DevOps: AWS Firebase Nginx SSL certificates Heroku VPS 🎛️ Other Niches: WebMIDI WebUSB MediaStream Hardware Integration

🅷🅴🆈 👋 Hi! I’m a veteran full stack developer, mobile app developer, and team lead leading a senior long-term team capable of taking products from idea → launch → scale → maintenance. I’ve been in professional software development for 25+ years and mobile app development for 17+ years, delivering scalable iOS Development, Android App Development, Flutter, React Native, and backend-driven platforms across startups, SaaS products, enterprises, and high-growth mobile ecosystems. Clients usually come to us when they need more than just coding - they need a technical partner who understands architecture, business logic, scalability, monetization, and long-term product growth. As a mobile application developer, ios developer, android developer, flutter developer, and full stack developer, I specialize in building high-performance native and cross-platform mobile apps used by millions of users worldwide. I work with native iOS development using Swift, SwiftUI, UIKit, and Objective-C, native Android development with Kotlin and Java, as well as Flutter, React Native, and hybrid app development for scalable cross-platform delivery. Over the years, I’ve helped build 700+ apps across fintech, healthcare, social networking, education, entertainment, e-commerce, IoT, and enterprise SaaS. My experience covers the full mobile app development lifecycle - system architecture, UI/UX implementation, backend development, API Integration, DevOps, deployment, scaling, optimization, and long-term product evolution. 🏆 Why Clients Choose Me ✔️ 25+ years as a full stack developer and software architect
 ✔️ 17+ years in mobile app development
 ✔️ 700+ mobile apps delivered across iOS, Android, Flutter & React Native
 ✔️ Expertise in native app development, hybrid app development, and scalable backend systems
 ✔️ Reduced crash rates by up to 70% and improved app performance by 50% on production apps
 ✔️ Built mobile platforms used by 5M+ users worldwide
 ✔️ Strong experience with Mobile App Improvement, Mobile App Bug Fix, and modernization projects
 ✔️ Long-term experience with startups, SaaS companies, enterprises, and Fortune 500 clients
 ✔️ Full-cycle delivery: architecture → development → deployment → scaling → support 📱 Native iOS & Android Development • Native iOS Development with Swift, SwiftUI, UIKit, Combine, Objective-C • Native Android App Development with Kotlin, Java, Jetpack Compose • Smartphone app optimization for performance, UX, and scalability • Clean Architecture, MVVM, VIPER, modular app structures • Device integrations: BLE, GPS, biometrics, camera, sensors, HealthKit, Google Fit • App Store & Google Play deployment pipelines • Multi-language apps with localization and accessibility support • Advanced performance optimization and memory management 🔁 Cross-Platform & Hybrid App Development • Flutter developer expertise for scalable cross-platform products • React Native development with custom native module integrations • Kotlin Multiplatform Mobile (KMM/KMP) • Shared business logic across iOS and Android • Adaptive UI systems and responsive mobile layouts • Cross-platform architectures reducing development time by 40–60% 🔧 Backend, API Integration & Infrastructure • REST API and GraphQL API Integration • Firebase, Node.js, PHP, and scalable backend services • Authentication systems, caching, offline sync, token management • SQLite, Room, Realm, Core Data • Push notifications: FCM, APNS, OneSignal • Real-time chat, geolocation systems, dashboards, and live data platforms • Backend-connected mobile ecosystems with scalable cloud infrastructure ⚙️ DevOps, CI/CD & Delivery • Fastlane, GitHub Actions, Bitrise, Firebase App Distribution • Automated testing and deployment pipelines • Beta testing, crash analytics, staged rollouts • CI/CD optimization for faster and safer release cycles • AWS and scalable cloud deployment workflows 📊 Analytics & Monetization • Firebase Analytics, Mixpanel, Amplitude, Google Analytics • In-app purchases, subscriptions, AdMob, Facebook Ads • Retention optimization and funnel analytics • Data-driven product iteration and growth optimization 🔌 Advanced SDK & Hardware Integrations • AVFoundation, CameraX, Core Bluetooth, Core Motion • Stripe, Twilio, Agora, Sendbird, Mapbox, OpenCV • IoT dashboards, BLE integrations, voice/video systems • Camera-heavy and sensor-based mobile applications 🌍 Industries Served • Fintech & Banking • Healthcare & Fitness • E-commerce & Retail • Smart Home & IoT • Education & E-learning • Social Networking • Travel & Hospitality • Entertainment & Media • SaaS & Enterprise Platforms ✅ Let’s Build a Mobile Product That Scales!

Software Engineer with 25 years of experience spanning desktop, web, and cloud. I would describe myself as a generalist, equally comfortable with front and back ends, core stack, architecture & design, and of course implementation and maintenance. My work experience spans several industries, including: Video games Finance Streaming technology Medical Proficient with multiple languages, platforms, and technologies: C & C++ C# .NET including: Windows Forms WPF UWP WinUI3 MAUI Avalonia Python and others, as needed. Database creation and app integration, including: SQLite MS SQL MySQL MariaDB Web development, including: HTML CSS JavaScript PHP Target platforms: Windows Linux Mac Android PlayStation Xbox

Languages: Kotlin, Java, Swift, Python Frameworks/Libraries: Android SDK, Jetpack Compose, SwiftUI / UIKit, Retrofit, Gson, Glide, OpenGL ES Tools: Android Studio, Xcode, Google Play Console, App Store Connect, CircleCI, Git, GitHub Actions Practices: MVVM, Clean Architecture, Agile/Scrum Firebase: Analytics, Auth, Crashlytics, Realtime DB, Firestore, GeoFire Other: Streamlit, PDF-to-image processing, Ollama multimodal-LLMs

Since 2013, we’ve been building and deploying cutting-edge solutions at the intersection of artificial intelligence (AI), mixed reality (MR), and augmented reality (AR). Our products have supported clients in defense, healthcare, nuclear power, sports, and consumer tech—delivering real-world impact across industries. What We Do Best: 🔍 AI-Driven Computer Vision We design and deploy custom models for object detection, facial recognition, image segmentation, pose estimation, and depth sensing. Our team works with Apple’s Vision framework, YOLO, TensorFlow, CoreML, MediaPipe, and OpenCV—optimized for mobile, edge, and embedded systems. 🚀 OpenClaw ClawdBot Early Innovator! I created the first OpenClaw governance and safety layer (like antivirus but for controlling AI Agents) called ClawBoss.ai . It deterministically blocks unauthorized agent actions, secures users API keys, tokens, etc. and even anonymizes their personal information. 🧠 Machine Learning at the Edge From real-time inference on mobile devices to on-device learning for AR headsets and IoT sensors, we specialize in bringing intelligence to constrained environments—without reliance on the cloud. 🛠 Cross-Platform Spatial App Development Whether it’s ARKit on iOS, RealityKit on Vision Pro, or MRTK on Hololens, we bring ideas to life with a robust technical stack: Swift, Flutter, Unity 3D, Python, and more. We’ve built camera-based systems, gesture controls, UWB positioning features, and context-aware spatial workflows. 🧬 Human Behavior & Emotion Tracking We’ve built AI pipelines for facial expression classification, gaze detection, and skeletal tracking, applied in high-stakes domains like defense, public safety, and professional sports. 🚀 Rapid Prototyping & Productization We go beyond demos. Our team takes concepts from wireframes to working prototypes—and then all the way to deployed systems used in the field. Clients often tap us for technical validation, pilot programs, and IP-generating innovations. Let’s talk about how we can bring your next AI + AR project to life—efficiently, creatively, and with future-proof architecture.

Two Upwork client contracts delivered: Python parsing pipelines into Flask and SvelteKit handbook apps for a U.S. Coast Guard reference tool and an oil-and-gas safety handbook. Currently building the iOS/Android responder app for the same client (237 commits in two months). Solo Flutter app launching with a paid tier: 839 commits, 46 test files, ten months of focused work. Portfolio at neoreca.dev is itself a showcase, built with Astro 5, Tailwind CSS v4, and Supabase. I build web and mobile applications from scratch, handling everything from PDF parsing to UI to database to deployment. What I work with: Mobile: Flutter and Dart. State management with Provider, local databases with Drift/SQLite, GoRouter for navigation, RevenueCat for in-app purchases, Material Design 3. Web: Astro 5, SvelteKit 2 with Svelte 5 runes, React, Next.js, TypeScript, Tailwind CSS v4. Static sites and server-rendered apps deployed to Cloudflare Pages. Backend and data: Supabase (auth, row-level security, edge functions on Deno), Go (chi v5, raw SQL, Postgres 16), Python 3.12 data pipelines (Azure Document Intelligence, PyMuPDF, SQLite with FTS5 full-text search). Cloudflare Turnstile for bot protection. Desktop: Tauri + Rust + SvelteKit for local-first apps. What I've built: IMH Navigator (Upwork client, two contracts delivered): Web apps for navigating large emergency response handbooks. A 392-page Coast Guard handbook parsed into 362 sections, 322 acronyms, and 183 glossary terms, then deployed as a Flask demo for client review. Then a 273-page oil-and-gas handbook parsed into 171 sections and 58 structured role pages with parsed responsibilities, checklists, and Mermaid org charts, built with SvelteKit 2 and Svelte 5 runes. Six-step Python pipelines with audit regression checks on every rebuild. Both contracts closed cleanly. USCG IMH Responder App (Upwork client, in progress): Flutter app for Coast Guard responders. 237 commits in two months. ICS form wizards with jump-between-steps navigation, draft management with undo, haptic feedback, and embedded SQLite content shipped from the parsing pipeline. Film Development Timer: A Flutter app for film photographers with audio-guided timing, chemistry exhaustion tracking, push/pull processing, and a RevenueCat-gated paid tier with trigger-keyed analytics. 839 commits, 46 test files, ten months solo from concept to launch. Waitlist landing page built with Supabase, Cloudflare Turnstile bot protection, and an edge-function welcome email pipeline. Neosoft Wimbows 99 blog: A Windows 98 desktop simulation in React with draggable/resizable windows, real-time chat via Supabase, mini-games, a sound system, and a fake DOS prompt. Mirrored on Neocities. Distinct enough that it stands on its own as a portfolio piece. neoreca.dev: My portfolio itself. Astro 5, Tailwind CSS v4, custom scroll-triggered animation systems, two separate deployments (static portfolio plus SSR admin dashboard for waitlist analytics). Three visual contexts (cinematic dark, film-dev orange, Win98) sharing a single codebase. Personal projects that keep my range fresh: Finance Tracker (Go + SvelteKit + Postgres) and Synth Bench (Tauri + Rust + SvelteKit). I build with the stack I'll need next, not just the stack I already know. How I work: I write clean, well-structured code and communicate clearly about progress and decisions. I respond within 24 hours. I'm comfortable working independently on full features or slotting into an existing codebase. My current client engagement is a two-month-in active subcontract, so I'm available for additional fixed-scope or hourly work alongside it. See full technical write-ups for every project at neoreca.dev