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I build production software for Apple platforms (iOS, tvOS, and watchOS) and Roku. My focus is video streaming, playback, and ad insertion, on a broad foundation of Apple-platform engineering. Across an 18-year software career, 15+ of it on Apple platforms, I've shipped for Bell Crave, Warner Media, ViacomCBS, IBM, and Quber. A few examples of my work: - Delivered Roku development on the Bell Crave streaming platform in BrightScript and SceneGraph, tuning load times and navigation across device tiers. - Tech-led the video player component across the ViacomCBS suite (MTV, Comedy Central, Nickelodeon, Noggin) on iOS and tvOS, and refactored ~35% of the shared codebase so each brand could extend it without breaking the others. - Built a lightweight HLS interstitial replacement for discontinuity ads via AVAssetResourceLoaderDelegate, parsing HLS manifests on the fly, opening a path to dropping a third-party ad SDK entirely. - Improved a watchOS app's battery life by 400%+ through a standalone design, HealthKit and location optimization, and removing memory leaks. - Integrated CSAI and SSAI ad insertion and analytics across client apps; added SharePlay and unit-test coverage. Streaming and ad insertion are where I go deepest, but they're a specialty, not a fence. I take on a range of Apple-platform contract work: app architecture, performance, complex UI, StoreKit, and more. Earlier on, I built the original Quber fintech app from scratch (users saved over $2M during beta) and worked for years as a 5-star iOS freelancer here on Upwork, with 22+ jobs and several multi-year clients. How I work: practical and honest. I'll tell you when something can't be done, or when a simpler approach saves you time and money. I'd rather scope a project realistically than oversell it. Available now for contract work.

Full-stack developer with 6+ years of experience building scalable web and mobile applications. I specialize in creating robust solutions from concept to deployment, with strong expertise in cloud architecture, DevOps automation, and AI-powered features. I've successfully delivered 20+ projects ranging from MVP startups to enterprise-level applications, consistently helping clients solve complex technical challenges and scale their businesses. What I bring to your project: End-to-end development expertise (frontend, backend, infrastructure) Solution architecture for complex business requirements Deep debugging skills that save time and money Clear communication and proactive project planning Frontend Development React.js (Redux, Context API, Hooks, Next.js) Vue.js (Vuex, Nuxt.js, Composition API) Modern JavaScript/TypeScript Responsive UI/UX implementation Performance optimization Backend Development Node.js (Express, NestJS, Fastify) RESTful APIs & GraphQL Microservices architecture Real-time applications (WebSockets, Socket.io) Database design (PostgreSQL, MongoDB, MySQL, Redis) Cloud & DevOps (AWS Specialist) AWS services: EC2, Lambda, S3, RDS, DynamoDB, CloudFront, API Gateway Infrastructure as Code (Terraform, CloudFormation) CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins) Docker & Kubernetes Monitoring & logging (CloudWatch, ELK Stack) Cost optimization strategies AI & Machine Learning Integration OpenAI GPT integration (ChatGPT, GPT-4, GPT-4 Vision) Python for AI/ML workflows Custom chatbots and AI assistants LangChain, vector databases Prompt engineering & fine-tuning AI-powered features (content generation, analysis, recommendations) Mapping & Geospatial Mapbox GL JS (custom maps, routing, visualization) OSRM (route optimization, distance calculations) Geolocation services Location-based applications GeoJSON data processing Mobile Development React Native (iOS & Android) Flutter (cross-platform apps) App store deployment Push notifications In-app purchases Web Scraping & Data Extraction Python (BeautifulSoup, Scrapy, Selenium) Node.js scraping tools API reverse engineering Data parsing and transformation Automated data collection pipelines Specialized Skills Solution Architecture: Designing scalable systems for complex requirements Project Planning: Breaking down large projects into manageable phases Debugging Expert: Quickly identifying and fixing critical issues Performance Optimization: Database tuning, caching strategies, CDN setup Security: Authentication (JWT, OAuth), data encryption, security best practices

Android Developer | 8+ Years | 1M+ Users Worldwide With 8+ years of Android development experience, I’ve designed, built, and optimized apps trusted by over 1M users globally—including high-impact projects like Getaround and HyreCar. I specialize in writing clean, maintainable code and delivering scalable, high-performance applications with seamless user experiences. As a Top-Rated Plus Freelancer on Upwork, I’ve earned $20,000+ with a 100% Job Success Score, a testament to my reliability, quality, and client satisfaction. Whether you need a new app from scratch or want to enhance an existing one, I ensure performance, scalability, and user delight. 🛠️ Core Skills Languages & Architecture: Kotlin, Java, MVVM, Clean Architecture UI/UX & Interaction: Jetpack Compose, Navigation, Motion Layout, Material Design, Custom Views, Accessibility APIs & Communication: REST, GraphQL, Retrofit, Coroutines, RxJava, Socket.IO Firebase & Cloud: FCM, Analytics, Crashlytics, Remote Config App Publishing & Payments: Google Play Console, In-app Purchases, Stripe, Payment Gateways DevOps & Tooling: Git, CI/CD (GitLab), Docker, Fastlane Advanced Features: Hilt/Dagger, Location Services, Multi-language Support, Offline Handling, Performance Optimization, PDF/Excel Generation 🌍 Industry Experience 🚗 Car Sharing & Rentals: Getaround (1M+ users), HyreCar (500K+ users) 🩺 Healthcare & Wellness: Medicine Reminder, Alzheimer’s Detection, BMI Calculators 🛍️ E-commerce & Marketplaces: Sozer Jewelry, Weat Local Marketplace 🎙️ Media & Streaming: Silvers Radio, Streaming Radio Apps 🏋️ Fitness & Lifestyle: Custom Workouts, Freight Booking (FreightPrint) 🚀 Key Achievements ✔ Integrated advanced SDKs: Stripe (Payments), Mitek (ID Verification), Sendbird (Messaging), Instabug (Bug Reporting) ✔ Automated builds & releases with CI/CD pipelines in GitLab + Firebase distribution 💡 Why Work With Me? 🔹 Strong problem-solving skills – quick and efficient issue resolution 🔹 Proactive communication – clear updates, no guesswork 🔹 Clean code advocate – maintainability & scalability first 🔹 User-first mindset – intuitive, engaging, and accessible apps 🔹 Continuous learner – always up to date with the latest Android trends 📩 Let’s build your next Android app—scalable, performant, and user-friendly.

Hello! I'm Pavlo, an individual Android (Kotlin, Java) and iOS (Swift) developer with 13 and 8 years of commercial experience, respectively. I also have a few months of commercial experience in cross-platform development using Flutter. If you are looking for such a specialist, please take a couple of minutes to check out my profile. 🟢 MY SERVICES 🟢 The services I provide cover a broad spectrum of capabilities, which include, but are not limited to: - Developing mobile applications for iOS and Android, including iPhone, iPad, Android phones and tablets, TV and wearable devices. - Providing ongoing support, maintenance, and updates for existing apps. - Porting apps from different platforms to iOS and Android. - Recreating cross-platform and hybrid apps using native technologies. - Performing code migrations and updates, including SDK version, package builder, legacy libraries, and other tools. - Transforming app designs from Figma into functional applications. - Incorporating in-app purchases and advertisements into the apps. - Submitting the apps to the App Store and Google Play, resolving any review-related concerns. - Conducting prototyping and UI/UX design. - Creating comprehensive technical documentation and API specifications. 🟢 MY WORKING EXPERIENCE 🟢 My commercial experience as a mobile developer began in 2013 when I secured a job as an Android Java developer. Since 2015, I have been working exclusively as a freelancer. In 2016, I started learning Swift programming language and embarked on my career as an iOS developer. In 2018, I made a complete transition from Java to Kotlin for new Android projects. Recognizing the market's need for cost-effective solutions, in 2023, I started working as a Flutter developer. Throughout my journey, I have seamlessly acquired expertise in UI/UX design by closely adhering to the platform guidelines of both iOS (Human Interface Guidelines) and Android (Material Design). As an active user of both platforms, I constantly stay updated with the latest trends in products and technologies, ensuring I never miss out on key events like Apple WWDC and Google I/O conferences. Building upon my previous commercial experience as a QA engineer from 2012 to 2013, I combine meticulous attention to detail with strong perfectionistic tendencies, enabling me to consistently deliver exceptionally high-quality and reliable mobile applications. 🟢 MY SKILLS 🟢 Here are some of the cutting-edge technologies I utilize in my work. Native Android: - Android SDK, Gradle, Kotlin, Kotlin Coroutines, MVVM Architecture, Jetpack, Jetpack Compose, Retrofit, Apollo GraphQL, Hilt, Room for SQLite, and JUnit. Native iOS: - iOS SDK, Swift, Swift Package Manager, MVVM Architecture, SwiftUI, Combine, Concurrency, Alamofire, Apollo GraphQL, Swinject, CoreData, and XCTest. Flutter: - Flutter SDK, Dart, MVVM Architecture, Concurrency, dio, sqflite. I possess extensive experience working with numerous other technologies, frameworks, and libraries such as: Java, RxJava, XML UI, CocoaPods, UIKit, RxSwift, MVC & MVP Architecture, Dagger, Koin, Realm, Glide, Coil, Picasso, Kingfisher, SDWebImage, Google Maps & Geocoding, MapKit, HealthKit, Mapbox, Facebook SDK, Twitter SDK, Zoom SDK, GitHub SDK, Google Pay, Apple Pay, Stripe, Braintree, AdMob, Bluetooth, Bluetooth Low Energy (BLE), NFC, Camera API, Firebase SDK (Analytics, Crashlytics, Auth, Database, Firestore, Machine Learning, Storage, Hosting, Cloud Functions, and more).

🚀 I Build AI Agents That Answer Leads in 60 Seconds and Book Appointments While You Sleep Most service businesses lose 50% of their leads because nobody replies fast enough. I fix that. I design AI voice agents, chatbots, and SMS systems that qualify leads 24/7, book them straight into your calendar, and update your CRM automatically. No missed calls, no slow follow-ups, no leaked revenue. 🏆 Real Results From Past Clients: ✅ 60-second average lead response time (down from 4+ hours) ✅ 3x more booked appointments without adding staff ✅ 40% recovery on missed calls via SMS text-back ✅ 30+ hours/week saved on manual follow-ups ✅ 200+ automation systems shipped across real estate, healthcare, insurance, HVAC, and legal 💬 AI Chatbot Systems (Not Basic Bots) ✅ Website chat that books appointments directly into your calendar ✅ WhatsApp, Instagram DM, Facebook Messenger agents ✅ RAG-powered support bots trained on your docs and SOPs ✅ Lead qualification flows with smooth human handoff ✅ Multilingual support 📞 AI Voice Agents (Inbound + Outbound) ✅ AI receptionist that answers every call 24/7 ✅ Outbound calling for lead reactivation and follow-up ✅ Real-time appointment booking inside the call ✅ Smart call routing and IVR replacement ✅ Natural-sounding voices via ElevenLabs cloning ⚙️ Automation & CRM Systems ✅ Speed-to-lead workflows (SMS + email + call in under 60s) ✅ Missed call text-back recovery ✅ Full GoHighLevel setups: pipelines, calendars, workflows, A2P SMS ✅ Lead routing, tagging, and pipeline logic ✅ API and webhook integrations between any tools 🛠️ Tech Stack Voice AI: Retell AI, VAPI, Bland AI, Twilio, ElevenLabs, Synthflow Automation: n8n, Make, Zapier, Pabbly CRM: GoHighLevel (GHL), HubSpot, Salesforce, Pipedrive, Zoho LLMs: Claude (Anthropic), GPT-4/5, Gemini, Llama Databases: Supabase, Airtable, Google Sheets, Notion, Pinecone Channels: Twilio SMS, WhatsApp, Instagram, Messenger, Calendly, GHL Calendar 🏢 Industries I've Delivered For 🏠 Real Estate | 🏥 Healthcare & Dental | 🛡️ Insurance | 🔧 HVAC & Plumbing | ⚖️ Legal | 💰 Finance | 🛒 E-commerce | 🏪 Local Service Businesses | 📞 Marketing Agencies 📌 Notable Projects ✅ Built an HIPAA-compliant AI voice agent platform for a healthcare SaaS (Retell AI + n8n + React + MongoDB on AWS) ✅ Replaced a broken OpenAI chatbot for a US health insurance broker with a Claude + Voyage AI + Supabase RAG system that books directly via Cal ✅ Deployed an SMS qualification agent for a Chicago real estate investor that runs on Claude API + n8n + GHL ✅ Built a Spanish-speaking AI receptionist for a dental clinic that handles inbound calls and books patients 24/7 🤝 How I Work 1. 30-min discovery call to map your lead flow and pick the right stack 2. Scoped proposal with fixed milestones (no scope creep, no surprises) 3. Build, test with your real data, and hand off with Loom walkthroughs 4. 12 days of free post-launch support If you're losing leads to slow response times, missed calls, or messy follow-up, send me a message describing your current setup. I'll tell you exactly what I'd build and what it would take. Let's automate the boring part so you can focus on closing.

I'm a mobile and full-stack Software Engineer experienced with remote/freelance working that works with Python, Javascript, Typescript, Kotlin, Java, Android, React and Vue.js. - Programming: Python, Javascript, Typescript, Java, Kotlin, HTML5, CSS3, SCSS - Databases: PostgreSQL, MySQL, MongoDb, Flat files (CSV, XML, JSON) - Tools / Frameworks: Django, Flask, Pyramid, Falcon, React (Redux), Vue.js (Vuex), JQuery amongst others. - Source Control: GIT, SVN, Mercurial - API's: Facebook, Twilio, QuickBooks and more. - Patterns & Practices: N-tier development, Separation of Concerns, SOLID, MVC, MVVM, TDD, Repository, DAO, DRY. For more information including technical aspects of my previously completed projects please contact me.