Hire the Best WebRTC Developers
in Ukraine

As a forward-thinking Senior Engineer and Team Leader with over two decades of experience, I work as a full stack developer specializing in Video Streaming and real-time communication solutions based on WebRTC. I combine strong architecture thinking with hands-on delivery, acting both as a technical leader and a practical full stack web developer who understands real product needs and builds scalable WebRTC-powered systems. Today, my focus as a full stack developer includes the strategic application of advanced AI technologies alongside WebRTC-based real-time communication platforms. I actively work with OpenAI APIs, Whisper for speech recognition, LLaMA2 for open-source large language models, and LangChain for building AI-driven workflows. This positions me as a full stack developer AI who can integrate intelligence directly into real-world WebRTC video and streaming products. Throughout my career as a full stack developer, I’ve contributed to Telemedicine, Online Education, and Real-time Entertainment by building WebRTC-powered communication platforms. I’ve led teams delivering webinar platforms, live chat systems, and complex real-time applications, acting both as a senior web developer and system architect who ensures scalability, security, and long-term maintainability for WebRTC infrastructures. In AI-focused projects, I operate as a full stack developer who bridges data, logic, and user experience inside WebRTC-enabled applications. My team and I integrate conversational AI, speech-to-text, and knowledge-driven systems using OpenAI, Whisper, and LLaMA2. With LangChain, we design intelligent pipelines that automate workflows and data processing, enhancing WebRTC communication platforms with AI-driven capabilities. WebRTC remains a core part of my work as a full stack developer, especially for building high-performance real-time systems. We design everything from low-latency WebRTC infrastructure to complete applications, delivering solutions that work seamlessly across web and mobile. This includes building scalable video streaming app architectures capable of handling thousands of concurrent users through WebRTC. As a full stack developer, I also provide consulting and development services across North America and Europe, helping companies design and build WebRTC-based video communication platforms. I work with companies in Entertainment, E-Learning, Healthcare, and Finance. Depending on project needs, I act as a React developer, Wordpress developer, or mobile app developer while implementing scalable WebRTC solutions. Our services as a full stack developer team include system architecture, UI/UX design, and custom development of WebRTC streaming and real-time communication platforms. We build modern interfaces, robust back-ends, and real-time systems, including secure WebRTC video stream delivery for live and on-demand use cases. We have worked with most of the major Webinar and Online Education platforms on the market, delivering solutions as a full stack developer team that understands both the business and technical sides of WebRTC video streaming products. We frequently modernize existing platforms and migrate legacy systems to scalable cloud-based architectures built around WebRTC technologies. As a full stack developer, I’ve led the creation of webinar systems, live chat apps, WebRTC video conferencing platforms, real-time video auctions, messengers, e-learning platforms, telemedicine solutions, dating apps, Twitch-like platforms, TikTok-style apps, VoD systems, and live shopping platforms. Many of these solutions rely on modern stacks including full stack developer React and full stack Lavarel approaches integrated with WebRTC. Beyond development, I support clients as a full stack developer with load testing and performance optimization for large-scale WebRTC streaming systems. My background across front-end, back-end, databases, and cloud platforms allows me to lead projects end-to-end and deliver reliable, production-ready WebRTC platforms. I invite you to collaborate with me as a full stack developer who understands AI, WebRTC, and scalable real-time product development. Together, we can build innovative WebRTC-powered solutions that align with your business goals and grow with your users.

Are you looking for an expert Android Developer to build a high-performance, cross-platform mobile application? As a Senior Android Developer specializing in Kotlin Multiplatform (KMP) and Compose Multiplatform (CMP), I help businesses launch native-quality apps while reducing Mobile App Development costs by up to 50%. By sharing business logic across Android and iOS, I ensure your project is scalable, maintainable, and built for long-term success. 🚀 AI-Powered Android App Development Velocity I leverage an advanced AI-augmented workflow (Cursor, MCP, and Gemini/Claude) to accelerate the Mobile App Development lifecycle. This allows me to: - Code Faster: Automate boilerplate so I can focus on your app's unique architecture. - Increase Accuracy: Use AI-driven refactoring to ensure your Android App is bug-free. - Rapid Prototyping: Deliver production-ready MVPs in record time without sacrificing native performance. 🚀 Core Expertise To deliver world-class Mobile App Development, I utilize a cutting-edge tech stack: - Kotlin Multiplatform (KMP): Expert-level sharing of business logic, networking, and data layers. - Compose Multiplatform (CMP): Designing 100% shared, responsive UIs for Android, iOS, and Desktop. - Native Android: Jetpack Compose, Material 3, Coroutines, and Flow. - Architecture: MVI/MVVM Clean Architecture for scalable, testable codebases. - Smart Notifications: Implementing complex Push Notification strategies, including rich media alerts, deep-linking, and background data synchronization. 🛠️ Technical Stack - Languages: Kotlin, Java, Swift (Interop). - DI & Local Data: Koin, Hilt, SQLDelight, Room. - Networking: Ktor, OkHttp, REST, WebSockets, Apollo GraphQL. - Real-Time & Media: WebRTC (Audio/Video), Twilio, PJSIP, Jitsi, Firebase Services. - Hardware & IoT: Bluetooth (BLE), Geolocation, Maps, and Sensor integration. 💼 Why Choose Me as Your Lead Android Developer? - Top Rated Plus: 100% Job Success Rate and a veteran Android Developer of the Upwork platform. - End-to-End Delivery: From initial concept and architecture to successful Play Store/App Store deployment. - Proven Experience: Numerous commercial projects and a deep portfolio of open-source work on GitHub. - Scalable Solutions: Experience building complex features like WebRTC, Biometrics, and IoT integrations. Whether you need a Kotlin specialist to refactor an existing codebase or a Mobile App Developer to build a cross-platform solution from scratch, I provide the technical leadership your project deserves. 📩 Let’s build your next-gen mobile app. Click the "Invite to Job" button to discuss your requirements and see how my AI-augmented workflow can save you time and budget!

👋 Hi, I’m Oleksii - a Twilio expert with over 7 years of hands-on experience building scalable, real-time communication systems using the full Twilio stack: 📞 Programmable Voice / SMS, 🧠 TaskRouter & Flex, 🎛️ Studio, Functions, Conversations, Sync, Webhooks and more. I’ve successfully completed 120+ Twilio projects on Upwork, including: • Eliminating latency issues in phone calls 🔧 • Creating SMS marketing automation pipelines 📲 • Developing full-scale Flex dashboards with custom workflows 🧩 Clients describe me as: “Very skilled, excellent communicator, smart guy and a pleasure to deal with.” “Oleksii was very helpful and available :) We no longer have problems with latency during our phone calls.” 🛠 Whether you need help with: • Twilio Studio call flows • Complex webhook-based automation • TwiML, IVR, call forwarding setups • Integrating Twilio with CRMs or internal systems • Building voice/SMS logic in Node.js, Laravel, or Firebase environments …I’ve got you covered. Let’s bring your Twilio-powered solution to life 🚀 Feel free to invite me to your job or message me with questions.

I am a Senior Mobile App Developer with over 5 years of experience in Dart, Flutter. My programming journey started from my first Turbo Pascal lesson in school, evolving through Java since 2017 and Flutter since 2019. I am interested in top IT patterns and technologies and continuously improve in writing clear, maintainable, and flexible code to delight my esteemed clients with quality. Skills and Experience: - Proficient in Android SDK, Visual Studio, and OOP/SOLID - Experienced with REST API, GraphQL, and Web Socket - Skilled in CI/CD GitLab, Firebase Services, and In-App Purchase - Fluent in Java since 2017 and Flutter since 2019 Projects and Accomplishments: - Developed Cattle Scan, Alfa-portal, CoffeesUp USA, and 3 Wella, showcasing a commitment to quality and user-centric design Education: - Master of Computer Sciences, ISCE- 0611 Computer use, ISCED- 0613 Software and application development and analysis (2021 - 2023) - Higher technical education in Design Engineer Avionics (2005 - 2010) I thrive on teamwork and the open interplay of minds, believing that the future of an advanced society relies on collaborative innovation. Let's connect and create something remarkable together.

Senior Chrome Extension Developer with 10+ years of experience. 300+ Chrome extensions developed. 140,000+ Users. I specialize in developing custom chrome extensions for internal use within your team. A custom chrome extension can be a powerful tool that improves your internal workflows and enhances websites that your business relies on. If you or your employees perform tedious manual tasks like copy-pasting, filling forms, looking up information on different websites - a custom chrome extension can greatly improve your experience and make work more streamlined and enjoyable. I can also integrate AI features into your extension like generating messages and images. I have experience implementing chrome extensions that work with the following websites and API providers: Gmail, Google Sheets, Google Drive, Google Docs, Google Meet, Outlook, Microsoft Word, LinkedIn, Facebook, Instagram, Amazon, Ebay, Shopify, Etsy, Salesforce, HubSpot, Zoho, Ticketmaster, LiveNation, Zillow, Notion, Airtable, ChatGPT, OpenAI, Gemini, Claude, Stripe, SendGrid, Firebase, Supabase, Google Cloud. I have experience implementing complex technologies to enhance chrome extensions: Vector search based on AI embeddings. Browser automation on a remote server. Remote configuration of website selectors. Video and audio recording, WebRTC. PDF generation. AI model tuning. Here is what I can provide you: A custom chrome extension that solves a specific problem within your team. An admin panel where you can configure settings of the extension and see usage analytics. A secure private server to store your information and secret keys. Complete ownership of any code I create or systems I develop for you. Lifetime support for any issues that may occur while using the extension. I guarantee that you’ll be happy with the chrome extension I create, or your money back. The systems I create are 100% secure and reliable in the long term. I use the latest AI tools to improve development speed and quality. I am currently available, happy to answer any questions.

Looking to launch a production-ready AI SaaS MVP in 4-8 weeks? Or need a scalable multi-agent system built by a full stack developer that actively reduces operational costs instead of burning through your API budget? I architect enterprise-grade AI products and build high-load SaaS platforms. Working at the exact intersection of AI research, product engineering, and scalable business logic, I help founders integrate high-performing, autonomous workflows into their core systems with the comprehensive vision of a full stack developer Whether you need an independent Lead Architect or a fully managed development pipeline (backed by my scalable team of 5-15 dedicated developers), I provide the transparent, human-to-human technical leadership of an experienced full stack developer to turn complex ideas into profitable products and ensure your investments deliver 100% measurable ROI 🧠 Core AI & LLM Architecture (My Specialty): • LLM Orchestration: Designing advanced, multi-step reasoning pipelines using Claude, OpenAI, and Gemini. • Autonomous AI Agents: Engineering tool-using agents as a full stack developer with strict function calling to automate 10k+ complex daily tasks securely. • Advanced RAG Systems: Architecting high-precision vector search engines (Pinecone, Supabase, Qdrant, pgvector) with semantic retrieval to eliminate hallucinations. • Precision Engineering: Expert-level prompt engineering, structured JSON output enforcement, and custom model fine-tuning for 99%+ accuracy. • Token & Cost Strategy: Implementing context caching, dynamic cost-optimization algorithms, and credit-based SaaS billing models. 🚀 SaaS, MVP & Automation Infrastructure: • Scalable Architectures: Fast, production-ready launches with multi-tenant systems, robust Role-Based Access Control (RBAC), admin panels, and billing integrations built by a full stack developer. • Event-Driven Workflows: Building complex, fault-tolerant n8n automation loops and custom integrations. • High-Load Processing: Deploying robust background workers and asynchronous queues (Redis, BullMQ) to handle heavy LLM traffic seamlessly. ⚙️ Robust Engineering by a full stack developer: • Backend: Node.js, NestJS, Laravel (PHP) - high-load optimization handled by a full stack developer. • Frontend: React.js, Next.js (SSR, SEO), TypeScript, Tailwind CSS, ShadCN for modern UIs. • Cloud & Security: Integrating LLMs into existing tech stacks with strict data masking, secure isolation, AWS, GCP, Docker, and seamless CI/CD pipelines. If you want to hire a full stack developer to build a truly intelligent product that scales, let's talk Send me a message or hit "Invite" to discuss your AI and SaaS architecture today!