🚀 Top React Native & AI-Powered Mobile Development Expertise 🤖 Building AI-native mobile applications, intelligent assistants, and scalable SaaS products ⚡ Accelerating MVP delivery by 30–40% using AI-assisted engineering workflows 📱 5+ years of React Native experience delivering cross-platform applications for startups and growing businesses 🔧 Working with OpenAI, Claude, Gemini, AI Agents, LLM integrations, automation workflows, and modern AI tooling 🌎 Delivered mobile products across Healthcare, Fitness, FinTech, SaaS, eCommerce, Marketplaces, and Enterprise domains Welcome! 👋 I'm a Senior React Native Engineer specializing in AI-powered mobile products, cross-platform application development, and scalable SaaS solutions. Over the last 5+ years, I've helped startups and product teams launch mobile applications used by thousands of users worldwide. My focus goes beyond coding — I help design scalable architectures, integrate AI capabilities, and bring products to market faster using modern AI-assisted development workflows. 🚀 AI-FIRST MOBILE DEVELOPMENT ✔ OpenAI, Claude, Gemini, and custom LLM integrations ✔ AI-powered chatbots and virtual assistants ✔ AI Agents and workflow automation ✔ Text, image, document, and voice processing ✔ RAG-based knowledge systems ✔ AI-powered search and recommendations ✔ Healthcare AI, SaaS AI, and productivity applications ✔ Rapid AI MVP development and validation 📱 MOBILE DEVELOPMENT EXPERTISE ✔ React Native & Expo ✔ TypeScript & JavaScript ✔ iOS & Android development ✔ Firebase & Supabase ✔ REST APIs & GraphQL ✔ Offline-first architectures ✔ Push notifications ✔ Authentication systems ✔ Payment integrations ✔ Maps & geolocation services ⚡ PRODUCT & ENGINEERING IMPACT ✔ 30–40% faster delivery through AI-assisted development ✔ Production-ready scalable architectures ✔ Clean, maintainable codebases ✔ Strong focus on performance optimization ✔ Product-oriented engineering approach ✔ Long-term scalability and growth mindset 🎯 WHAT CLIENTS VALUE ✔ Deep React Native expertise ✔ AI-native product thinking ✔ Fast execution without sacrificing quality ✔ Transparent communication ✔ Strong ownership mentality ✔ Ability to bridge product, business, and engineering goals Whether you're building an AI-powered startup, SaaS platform, marketplace, healthcare application, or mobile MVP, I'm ready to help transform your idea into a scalable, production-ready product.

Need a marketplace developer who has actually shipped two-sided platforms? That is all we do. I lead delivery at Roobykon Software, a dedicated marketplace developer and Sharetribe developer team. I help founders build two-sided marketplaces, booking platforms, and multi-vendor marketplace MVPs, the kind that connect buyers with sellers, hosts with guests, or clients with service providers. Think Airbnb, Etsy, Turo, TaskRabbit, or Booking, built for your niche. Why founders pick me: 🔹 150+ successful marketplaces launched globally 🔹 5-week MVP delivery, from idea to a working, revenue-ready product 🔹 Trusted for 14 years in commercial delivery 🔹 Serving customers across 50+ countries (Europe, North America, and MENA) 🔹 Built SaaS trusted by 3000+ users worldwide 🔹 Scaled a Minimum-Viable-Product platform to $3M in investment 🔹 Platforms ranging from lean MVPs to multi-million-dollar ecosystems 🔹 Delivered for clients in e-learning, real estate, healthcare, rentals, and more What I build: 🔸Two-sided and multivendor marketplace platforms (Sharetribe, Sharetribe Flex, Ruby on Rails, Node, Next.js) 🔸Booking, reservation, and scheduling systems with availability management 🔸Reverse and B2B marketplaces where buyers post requests and providers apply 🔸Directory and listing platforms with map-based search 🔸Migrations and rebuilds from Bubble, WordPress, WooCommerce, Shopify, and Magento 🔸Niches I have shipped in: rentals, on-demand and gig services, home services, real estate, logistics and delivery, events and ticketing, e-learning, healthcare, wellness, and B2B and ecommerce marketplaces. Payments and marketplace mechanics we know cold: 🔹 Stripe and Stripe Connect (Standard, Express and Custom): escrow holds, commission splits, platform fees, and payouts 🔹 Multi-party and multi-currency payments, subscriptions, and tax automation (Stripe Tax, Avalara, TaxJar) 🔹 Vendor onboarding, dual user roles, admin panels, and vendor dashboards 🔹 Real-time chat, notifications, ratings and reviews, and identity verification The team behind your build: Our people cover the full stack, so you get one accountable partner instead of five freelancers. That includes Sharetribe developer, full stack developer, web developer, React developer, Angular developer, Node.js developer, and if required WordPress developer and Bubble developer skill sets, plus product and business analysis to turn your idea into a clear, buildable scope. Once launch is done, we support growth too: website development, SEO, and organic growth to bring your first users in. How we work (the value you actually get): ➜ We scope honestly: realistic timelines, no overpromises, and a straight answer on what to cut for a lean MVP. ➜ We think like product architects, recommending proven APIs and tools over custom builds wherever it saves you money. ➜ We stay transparent from discovery through QA, deployment, and post-launch optimization. ➜ We position as a partner, not a vendor: technically fluent, and honest about fit before you spend a dollar. If you are building a Sharetribe marketplace, a two-sided platform, or a marketplace MVP and want a team that has done it 150+ times, send a short message about your product. Happy to give you a straight, practical read on scope and timeline on a free consultation.

I'm Roman, CTO and founder of Define Solutions. Since 2016, we've shipped more than 200 mobile projects generating over 15 million downloads across the App Store. Over the years, we've built products across almost every category: fitness and health tracking, healthcare platforms, GPS and navigation systems, marine navigation applications, mapping and location-based services, entertainment and lifestyle products, news and media platforms, music streaming applications, restaurant and food ordering systems, e-commerce stores, social networks, messaging platforms, e-readers, marketplace applications, iPad products, Apple Watch companions, and CarPlay integrations. Beyond traditional mobile apps, we've delivered AI-powered experiences, recommendation engines, subscription-based products, payment integrations, real-time communication features, complex backend integrations, and highly scalable enterprise systems. We've worked with startups building their first MVPs, established businesses launching new products, and large organizations developing both internal operational tools and customer-facing applications used at scale. Some projects start with a detailed specification. Others arrive halfway through development after a previous team couldn't deliver. We've successfully handled both. One thing you learn after 200+ projects is that writing code is only a small part of building a successful app. The projects that launch smoothly are the ones where requirements are clear, technical risks are identified early, App Store constraints are considered from day one, and everyone agrees on what success looks like before development begins. That's why every engagement starts with understanding the product, validating the scope, and identifying potential challenges before a single line of code is written. Whether you need a new iOS app, help finishing an existing project, or guidance on architecture, scalability, AI integration, App Store launch strategy, or modernizing an existing codebase, I'd be happy to discuss it. Send me a message and I'll tell you honestly whether we're a good fit and what it would likely take to get your project delivered.

I’m a frontend developer with 9 years of experience in JavaScript, specializing in React.js and Next.js. I’ve built fast, scalable, and responsive web applications using the latest tools in the React ecosystem. From dashboards to CRMs, ERPs, and fully adaptive websites - I cover the full frontend cycle, including performance optimization, code testing, and deployment. Here’s what I work with most: - React.js (including Redux, Hooks, Context API) - used daily for SPAs and complex frontend logic - Next.js - for SEO-friendly, high-performance websites and web applications (SSG, SSR, API routes) - Building responsive and adaptive UIs across screen sizes and browsers - Styling with CSS, Sass, Tailwind, styled-components (depending on project needs) - Integrating JavaScript animations and custom plugin logic - Writing robust tests using Jest, Enzyme, Sinon, and Nightwatch I have a strong grasp of the full software development lifecycle and always prioritize clean, maintainable code. Whether you need help starting a React / Next project, refactoring an existing React /Next app, or building a complete frontend from scratch - I’d be glad to help. I’m open to long-term full-time remote frontend positions focused on React and Next.js.

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!

Hello, everyone ✋ I am a Full-Stack Developer with 5 years of immersive experience crafting, refining, and launching scalable web applications. Adept in both front-end and back-end technologies, I'm passionate about creating top-notch, user-friendly solutions that truly resonate with audiences.I specialize in website, SaaS, eCommerce, mobile app, and enterprise software. 🏆 Certified Senior Full-Stack Node.js Developer 🥇 Senior full stack developer in React.js Node.js Next.js Nest.js JavaScript Developer 👌 Cost-Efficient Services ⚡️ Proficient in React.js, Next.js, Redux, and TypeScript, I specialize in diverse UI development using Bootstrap/Material-UI, Restful API, GraphQL. I have extensive experience integrating third-party APIs like Stripe, Twilio, and Google Maps. ⚡️ My expertise extends to backend development, where I utilize the Mongoose ODM library for MongoDB and work with SQL, including writing aggregate functions. I am skilled in Node.js, Nest.js, and Express, incorporating libraries such as JWT, FS, Nodemailer, Socket.IO, Mongoose, Sequelize, cors, etc. ✅Front-End Technologies: Vue.js, JavaScript, React.js, HTML, CSS ✅Back-End Technologies: Node.js, TypeScript, Express.js ✅Database Systems: MongoDB, SQL, NoSQL ✅Version Control: Git, GitHub, Bitbucket, Jira ✅Agile Methodologies: Scrum, Kanban ⚡I'm fluent in English and will update you daily on my progress, ensuring you're always informed about your project's status. With a comprehensive skill set in frontend and backend technologies, mobile development, and service integration, I offer end-to-end solutions. I excel in large team environments and client interactions, committed to transforming ideas into successful projects.Let's start our collaboration now. Reach out!☎

Senior .NET Engineer and Solution Architect with 11+ years of experience building enterprise software, SaaS platforms, cloud solutions, backend systems, REST APIs, and desktop applications using C#, ASP.NET Core, and Azure. Expert in C#, .NET, ASP.NET Core, Azure, REST APIs, SQL Server, PostgreSQL, WPF, Entity Framework, and Software Architecture. I help companies design, develop, modernize, and scale business-critical applications, enterprise platforms, cloud solutions, and high-performance systems. My expertise includes: ✔ C# / .NET / .NET Core ✔ ASP.NET Core / Web API / REST APIs ✔ Azure Cloud Solutions ✔ Software Architecture & System Design ✔ SQL Server & PostgreSQL ✔ Entity Framework & EF Core ✔ WPF / MVVM / XAML ✔ SaaS Development ✔ Enterprise Software Development ✔ Performance Optimization ✔ Multithreading & High-Load Systems ✔ Database Optimization ✔ API Design & Integration ✔ Cloud Migration & Modernization ✔ Docker & CI/CD During my career I have worked on enterprise applications, CRM systems, SaaS platforms, desktop software, backend services, and cloud-based solutions used by businesses worldwide. Whether you need a Senior .NET Engineer, Solution Architect, or an expert to modernize and scale an existing system, I can help deliver reliable and maintainable software solutions.

🚀 With over 8 years of experience as a senior software and data engineer, I’ve honed my expertise in crafting innovative solutions in software development and data engineering. 📊 My journey began with a bachelor’s degree in software engineering and a master’s degree. 🎓 Currently, I’m pursuing a PhD in computer science to fuel my passion for technology and innovation further. 💡 🐍 Throughout my career, I’ve been deeply involved in diverse Python projects, crafting efficient and scalable solutions to meet various needs. 🌐 My proficiency in Python empowers me to tackle complex challenges and deliver high-quality software solutions. 🛠️ My core skills include: • Python 🐍 • Django 🌐 • Flask 🍶 • FastAPI 🚀 • AWS ☁️ • Software Architecture 🏛️ • PostgreSQL 🐘 • Data Engineering 📊 • Databricks 🔥 • Pandas 🐼 📚 I’m a firm believer in continuous learning and constantly strive to enhance my skills to produce top-notch code and data solutions. ✨ Beyond coding, I’m an avid sports enthusiast 🏃‍♂️ and regularly engage in various sports activities to stay energized and focused. 🏋️‍♂️

I help startups, enterprises, and product teams build, scale, and automate AI-powered web and mobile applications using Claude, Claude Code, and modern fullstack technology. Trusted across industries | AI-Native Development | Fullstack + AI Automation Expert I'm a Fullstack Developer and AI Developer specializing in AI web and mobile app development, AI orchestrators, Claude-powered applications, SaaS platforms, and end-to-end automation systems. I combine traditional fullstack engineering with AI-native workflows — using Claude and Claude Code to design, build, and ship production-grade software faster and smarter. What I can help you with: AI web app development AI mobile app development Claude-powered application development Claude Code implementation and workflow automation AI orchestrators and multi-agent systems Fullstack SaaS development AI SaaS product development AI agent and chatbot development API integration (Claude, OpenAI, Gemini, Grok, Mistral, Llama) Cross-platform mobile app development Progressive Web App (PWA) development Cloud-native application architecture Database design and management DevOps, CI/CD, and infrastructure automation Legacy system modernization with AI tooling AI-assisted MVP development and rapid prototyping I'm especially a good fit for projects like: "Need an AI developer to build a Claude-powered application" "Looking for a fullstack developer experienced with AI orchestrators" "Need an AI web developer to automate our internal workflows" "Looking for an AI mobile app developer for a cross-platform build" "Need a Claude Code expert to accelerate our dev pipeline" "Need a fullstack AI developer to build our SaaS MVP" "Looking for an AI automation developer to connect our systems" With hands-on experience across fullstack and AI development, I focus on building reliable, scalable products that combine solid engineering with intelligent automation. MY INDUSTRIES FinTech, Healthcare, LegalTech, Web3/DeFi, EduTech, Logistics & Supply Chain, Transport, E-Commerce, Retail, Manufacturing, Distribution, InsurTech, GovTech & Public Sector, Real Estate & PropTech, Travel & Hospitality, Cybersecurity, Media & Publishing, AI/ML & Data Analytics MY SOLUTIONS Multi-Tenant SaaS, AI SaaS, Decentralized App (dApp), Mobile App, Cross Platform App, Booking Platform, Progressive Web App (PWA), AI Tool, Learning Management System (LMS), Electronic Health Records (EHR), Case Management System, Inventory Management System, ERP, CRM, Trading Platform, Customer Portal, Marketplaces, Cloud-Native Application MY TECH STACK Front End Development: React.js, Next.js, Vue.js, JavaScript, TypeScript, Tailwind CSS, HTML, Angular, jQuery Back End Development: Node.js, Express, NestJS, Nuxt.js, Python, Django, Flask, Laravel, PHP, Firebase Mobile App Development: React Native, Expo, Flutter, Kotlin, Swift Database Management: MySQL, MongoDB, PostgreSQL, AWS RDS Messaging/Queuing: Apache Kafka, RabbitMQ, Redis Streams, NATS API Integration: RESTful APIs, REST, SOAP, FastAPI, GraphQL, gRPC, OpenAPI, WebSockets AI Integration: Claude, Claude Code, OpenAI, Gemini, ChatGPT, Grok, Mistral, Llama Cloud & Infrastructure: Linux, VPC, VM, Terraform, Lambda, CloudFront, EC2, EKS, ECS, Fargate, Lightsail, RDS, S3, Kinesis, Kubernetes, Docker, Nginx Version Control: Git, GitHub MY SKILLS Full-Stack Development | AI Developer | AI Web Developer | AI Web and Mobile Developer | Claude Fullstack Developer | Claude Code | AI Orchestrators | Software Development | Front-End Development | Back-End Development | Web Development | Web Application | Mobile Development | Desktop | Artificial Intelligence | Blockchain Development | AI Agent | Web3 | Chatbot | AI App Development | AI Voice | SaaS Development | Database Management | API Integration | AI Integration | AI Automation | Solution Architecture | AI SaaS | AWS | GCP | Azure | DevOps | AIOps | MERN Stack | IaaS | IaC 11.07.2026

Hello there, I'm a seasoned web developer hailing from Ukraine with a wealth of experience in both corporate settings and now as a dedicated freelancer. My journey began with crafting themes and plugins for websites within company environments, but I've since transitioned to freelance work where I've honed my skills even further. My expertise spans various facets of web development, with a particular focus on ecommerce projects and landing page optimization. I specialize in JavaScript and PHP, adept at breathing life into websites with seamless functionality and dynamic features. Whether it's crafting layouts from PSD templates or ensuring pixel-perfect precision, I take pride in delivering work that exceeds expectations. Over the years, I've delved into the intricacies of site optimization for improved Google rankings and accessibility, while also delving into the realm of SEO-friendly HTML and meta tag creation for enhanced social media visibility. Since 2018, I've embraced technologies like Laravel and VueJS, leveraging them to tackle complex projects ranging from server-rendered applications to API integration and data management. My skill set extends across a wide array of technologies, including: Technologies: - PHP 7+ -- Laravel -- Elastic search -- Wordpress ( creating themes and plugins ) -- WooCommerce -- Redis -- Custom scripts -- VM -- Docker -- bash scripts - Javascript -- VueJs -- Nuxt -- JQuery -- AngularJS -- Vuetify -- Quasar -- Cordova -- ChartJS - Databases -- Mysql -- Postgresql -- MongoDB - Design -- Html5 -- Css -- Sass / Scss -- Bootstrap -- Material design -- Pixel perfect codding -- Seo murcup -APIs -- Amazon Product Advertising API 5.0 -- Avantlink -- Google maps -- Google analytics -- IMDb (and same) -- TelegramAPI -- SteamAPI -- Google tag manager