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🚀 My name is Artem, Co Founder and CTO of JoinToIT. I am a Full Stack Developer with more than 12 years of experience building SaaS platforms, AI powered systems, and complex web applications. 💻 As a Full Stack Developer I have participated in more than 1000 successful projects for startups, SaaS companies, and enterprise platforms worldwide. ⚡ If you need a reliable Full Stack Developer who can design architecture, build scalable systems, and integrate AI or APIs into your product, feel free to contact me. I lead JoinToIT, a software development company with nearly 80 engineers including senior Full Stack Developer specialists, web developer experts, react developer engineers, wordpress developer professionals, and mobile app developer teams. Every Full Stack Developer on our team focuses on scalable architecture, business logic, and long term platform growth. Over the past decade I have worked as a Full Stack Developer building SaaS platforms, CRM systems, marketplaces, enterprise dashboards, and AI powered automation tools. Many companies hire me as a full stack developer saas when they need to build a product from idea to production with reliable architecture. Our engineers regularly work as full stack developer laravel and full stack developer php specialists building secure APIs, payment systems, and large scale SaaS platforms used by thousands of users. As a full stack developer crm I have helped companies automate sales pipelines, distribution management, and customer lifecycle platforms used by teams of 100+ employees. On the frontend side we work as full stack developer react engineers building scalable SaaS dashboards and modern web interfaces. Our developers also deliver projects as full stack developer react node building high performance web applications and API ecosystems. We also build real time systems as full stack developer react firebase engineers including authentication platforms, messaging systems, and live dashboards. Beyond SaaS platforms we also operate as full stack web developer teams delivering scalable web applications, internal platforms, and marketplace systems. Our backend engineers work as python full stack developer flask and python full stack developer django specialists building scalable APIs, automation platforms, and data driven systems. Many companies hire us simply as python full stack developer experts when they need robust backend architecture. For modern SaaS stacks, we also work as full stack developer supabase react engineers building scalable backend infrastructure and cloud native systems. Companies building AI driven products often hire us as full stack developer javascript saas ia or full stack ai saas developer teams to integrate OpenAI, Claude, and automation workflows into SaaS platforms. With more than 12 years of experience as a Full Stack Developer I have helped launch more than 100 SaaS platforms, 70 AI integrations, and 50 CRM systems used by companies worldwide. Our platforms support thousands of daily users and process millions of API requests every month. Our teams also work as web developer and react developer specialists building high performance user interfaces and SaaS dashboards. Some companies hire us as wordpress developer experts for custom plugin development and integrations. When projects require cross platform products our engineers also work as mobile app developer teams delivering mobile applications connected to backend SaaS systems. My skills: JavaScript React Web Application Web Development Software Architecture & Design Full-Stack Development Database Architecture PHP Python Node.js API API Integration WordPress PostgreSQL Web Design HTML5 Git Laravel MySQL Tailwind CSS Our technical expertise includes PHP, JavaScript, Python, React, Laravel, Node.js, Supabase, Firebase, Django, Flask, PostgreSQL, MySQL, WordPress development, Web Development, Full Stack development and modern AI APIs such as OpenAI and Claude. Whether you need a Full Stack Developer to build a SaaS product, an AI powered platform, a CRM system, or a scalable web application, my team and I are ready to help turn your idea into a production ready platform. Best regards Artem Chernitsov CTO, JoinToIT

❗❗❗I don’t just build interfaces - I build THE PRODUCT behind the business: scalable React applications, reliable backend systems, mobile apps, and architecture that survives growth. From MVP to 120K+ active users, I bring a full engineering team when you need more than a single React Developer. 20+ years of software development experience & Master’s in Computer Science Leading a dedicated team of 15+ software developers 70+ completed production-ready products $25M+ value generated through high-level architectural solutions 120K+ active users across delivered applications I’m a Full Stack Developer, React Developer, Node.js & Mobile Developer with 20+ years of experience building scalable SaaS platforms, enterprise applications, marketplaces, Ecommerce Websites, CRM and ERP systems, Healthcare Web Applications, HIPAA-compliant systems, fintech, logistics, booking platforms, and real estate products. FRONTEND REACT & WEB DEVELOPMENT 100+ products delivered across React.js, Next.js, React Native, TypeScript, JavaScript, Tailwind CSS, React Bootstrap, HTML5, CSS3, Redux and jQuery. As a React Developer, I build modern, responsive, high-performance interfaces with reusable components and maintainable frontend architecture. I can take Figma designs through UI/UX implementation and turn them into production-ready applications. More importantly, I understand the backend behind the interface. Frontend architecture is designed with APIs, data models, authentication, security, performance and scalability in mind. FULL STACK REACT & NODE DEVELOPMENT 45+ SaaS products delivered using Node.js, React, Next.js, Supabase, PostgreSQL, Laravel, PHP, MySQL, MongoDB, Firebase and Stripe. I build complete Backend API and Backend System Development solutions including: • REST APIs and third-party integrations • Authentication & authorization • Role-based access control • Business logic and workflows • Real-time functionality • CRM, ERP and admin dashboards • Ecommerce and B2B Marketplace platforms • Payment and subscription systems • Scalable database architecture • Cloud deployment and production infrastructure When you need a React Developer who can also own the backend, database and architecture, I can cover the complete development cycle. REACT NATIVE, EXPO & MOBILE DEVELOPMENT 12+ mobile applications deployed to the App Store and Google Play. As a React Native Developer / React Native App Developer, I build iOS and Android applications using React Native, Expo, TypeScript and Redux, with secure APIs and scalable backend infrastructure. I handle mobile UI, authentication, payments, push notifications, API integrations, subscriptions and app deployment. Mobile applications can share reliable backend architecture with web platforms while maintaining a native-quality UX. AI, AUTOMATION & n8n I build AI-powered products using OpenAI, ChatGPT, RAG, AI APIs, Python and automation workflows. I also use n8n to connect business systems, automate repetitive processes, orchestrate AI workflows and build scalable integrations. AI can be integrated directly into SaaS, CRM, Ecommerce, marketplace, healthcare and real estate platforms rather than being treated as an isolated feature. BROADER TECHNOLOGY EXPERTISE 30+ projects involving WordPress, Shopify, Angular, PHP, .NET, Flask, Vue.js, Svelte, Webflow and MERN Stack. My broader engineering expertise includes: • AWS, Google Cloud & Vercel • Supabase & Firebase • PostgreSQL, MongoDB & MySQL • Laravel & Symfony • Python, Node.js & PHP • REST APIs • Redux, Git & CI/CD • Software Architecture & Design • Front-End & Back-End Development • Cloud deployment & DevOps support INDUSTRIES & PRODUCT TYPES • Healthcare Web Applications & HIPAA-compliant systems • SaaS platforms and enterprise applications • Ecommerce Websites and CRM • B2B Marketplaces and multi-vendor platforms • Real estate and property platforms • Booking and scheduling systems • Logistics and operational dashboards • Fintech and payment solutions • AI-powered applications and automation • CRM, ERP and internal business systems • Secure, scalable backend infrastructure Whether you need a React Developer for a complex frontend, a Full Stack Developer React Node engineer, or a React Native App Developer, you get both hands-on engineering and access to a complete product development team. My team covers the full development cycle: UX/UI, UI Development, Responsive UI Build, Dashboard Build, frontend engineering, Backend API, Backend System Development, Data Architecture, integrations, mobile development, cloud deployment and DevOps support. If you need an experienced React Developer, Full Stack Developer, React Node & Mobile Developer, React Native Developer or React Web Developer to take your product from idea to production — let’s talk. 👉 Click “Invite” or “Hire” and let’s discuss your product, architecture and next development milestone.

Over the last 15 years, I have developed a range of mobile and web applications. I specialize in development for mobile cross-platform (iOS and Android) and web platforms ASP.NET Core

Senior Mobile App Developer - Android Developer (Kotlin, Kotlin Multiplatform) and iOS Developer (Swift) with 6+ years of Mobile App Development experience, focused first on Ecommerce, then Fitness & Health Care, and Logistics. I handle Mobile App Development end to end - architecture, UI, API integration, release and support. Over 6+ years as a Mobile App Developer I've shipped 40+ production apps with 1M+ downloads. 📊 Track record ✔️ 6+ years in Mobile App Development as a Mobile App Developer ✔️ 40+ apps delivered from scratch to production ✔️ 1M+ downloads across Android and iOS products ✔️ Core focus on Ecommerce apps, plus Fitness & Health Care and Logistics ✔️ Proven Android Developer and iOS Developer expertise ✔️ Cross-platform experience alongside Flutter when a project calls for it ✔️ US, UK and EU clients 🛒 Ecommerce - main focus As a Mobile App Developer, Ecommerce is where I deliver most value: catalogs, cart, checkout, loyalty, promotions and store locators. Stack: Kotlin, Jetpack Compose, Swift, Combine, Firebase. ⚙️ Android side 6+ years - native Mobile App Development Stack: Kotlin, Jetpack Compose, Coroutines, Room, Firebase Play Store - release and support As an Android Developer, I build new apps, take over existing codebases and improve architecture, performance and stability. My work here covers REST API integration, Google Maps, GPS, geofencing, NFC and Bluetooth LE for Ecommerce, Fitness and Logistics products. 🍏 iOS side 1M+ downloads - native Swift portfolio 6+ years - Mobile App Development background as a Mobile App Developer Stack: Swift, UIKit, Combine, StoreKit, HealthKit App Store - release and support As an iOS Developer, I build products in Swift with REST API, push notifications, maps and local storage. I can join as an iOS Developer to improve architecture, fix production issues or prepare an App Store release. My iOS Developer experience covers Ecommerce, Fitness, Health Care and Logistics. 📱 Kotlin Multiplatform 4+ apps - shared business logic across platforms Kotlin Multiplatform keeps Android and iOS logic synchronized and cuts duplicated code - a native alternative to Flutter As a Mobile App Developer, I use Kotlin Multiplatform when Android Developer and iOS Developer teams need one synced core with native UI on each side ⚙️ Industry impact Ecommerce & Retail - 6+ apps covering catalogs, loyalty, promotions and checkout flows Fitness & Health Care - 4+ apps with wearable sync, HealthKit and Google Fit integrations Logistics & Fleet - 3+ apps for driver workflows, asset tracking and GPS-based routing Enterprise - 90+ module platform built for long-term scalability NFC & Bluetooth LE - 3+ apps with hardware and device integrations 💪 Fitness & Health Care Second priority within my Mobile App Development scope: workout tracking, HealthKit and Google Fit integration, wearables, progress analytics - built in Swift and Kotlin for both platforms. iOS Developer work here includes HealthKit integration and workout tracking. My Mobile App Development workflow starts with product scope, API and platform requirements. As a Mobile App Developer I define architecture, implement the app, connect services, test and prepare releases, whether the job calls for an Android Developer, an iOS Developer or Kotlin Multiplatform. 🚚 Logistics - lowest priority, still covered Driver workflows, asset tracking, GPS and NFC scanning for fleet apps, delivered when Ecommerce and Fitness scope allows. As a Mobile App Developer, I keep Logistics inside the same Mobile App Development scope. ⚒️ How I build Kotlin, Jetpack Compose, Coroutines, Flow, MVVM, MVI, Clean Architecture Retrofit, OkHttp, Room, Firebase, WebSockets, offline caching Google Maps, GPS, Location Services, geofencing, NFC, BLE Crashlytics, automated testing, CI/CD, Play Store, App Store ✨ Why clients hire me Clients choose me because the numbers speak for themselves: 6+ years, 40+ production apps, 1M+ downloads, proven work across Ecommerce, Fitness, Health Care and Logistics. 🔑 Also searchable under: mobile app testing, mobile app design, mobile ux ui designer, android app developer, kotlin developer, kotlin swift 🚀 Delivery For a new product, Mobile App Development can be native or shared. An Android Developer approach fits Google-first products, an iOS Developer approach fits Apple-focused Swift products, while Kotlin Multiplatform fits a shared core - or Flutter if budget and timeline call for it. I also take over existing apps when the previous Mobile App Developer has left or a release is blocked - performance fixes, SDK updates and unfinished features. If you need an Android Developer, an iOS Developer, a Kotlin Multiplatform specialist or a Mobile App Developer for Ecommerce, Fitness, Health Care or Logistics, I can take the product from planning through release. 📩 Let's build something great in Mobile App Development.

🥇 TOP 0,01% BEST DESIGNERS ON UPWORK 🥇 CERTIFIED BY GOOGLE & UPWORK 🥇 900+ SUCCESSFUL PROJECTS COMPLETED 🥇 RECOGNIZED PORTFOLIO: 25,500+ DRIBBBLE & 9,600+ BEHANCE FOLLOWERS 🎯 TRUSTED BY: GOOGLE, UBER, NESTLÉ, P&G, AB INBEV, RHB Hi, I'm Yev. I partner with founders and product teams from Seed to Series B to take products from 0 to 1. As an experienced UX/UI designer and UI UX Designer, I don't just design screens — I build intuitive, high-performing digital products that drive growth. With over 10 years of experience in product design, creative direction, and web development, I bridge the gap between user needs and business goals. ✅ What I can bring to your product as a UI UX designer. ❇️ Strategic User Experience Design: As a Senior UI UX designer, I create user experience strategies that boost usability and drive engagement. My UX designer approach (including UX research and user flows) has led to conversion increases of up to 150% for previous clients. I specialize in UI UX that makes complex systems simple. ❇️ Expert Web Designer & Mobile App Designer: I specialize in mobile ui ux, iOS/Android app design, and responsive web design. I ensure a seamless user interface with a consistent look and feel across all platforms. Whether it's a mobile app ui ux designer task or a complex web design, I deliver pixel-perfect results as your lead UX/UI designer. ❇️ Figma Design & Prototyping: As a Figma designer and expert UI UX designer, I deliver high-fidelity wireframes, interactive prototypes, and design systems. I’ve delivered 5,000+ wireframes, helping streamline web development and reduce costly revisions. My expertise includes Figma ui designer roles and creating figma app design from scratch. ❇️ SaaS & Ecommerce Expertise: Whether you need a UI UX designer SaaS Figma specialist for complex ui ux dashboards or a Shopify website design that converts, I focus on layouts that drive revenue. I am a shopify website designer and wordpress website designer who understands how a UI UX designer impacts business metrics. ❇️ Technical Synergy & Handoff: I understand the bridge between design and code. I provide assets for Figma to React, Figma to Webflow, Figma to WordPress, Figma to Shopify, and Figma to HTML/CSS implementation. This ensures your website design is implemented exactly as planned by a technical UI UX designer. ✅ My achievements in numbers ❇️ UI UX designer for Logistics SaaS (React): Improved order processing efficiency by 200%. Reduced human error by 50% through enhanced user interface design. Cut manual work by 70%, boosting productivity for SaaS platforms. ❇️ Mobile App UI UX Designer for Health/Fintech: 2x user retention by redesigning the mobile app design. 3x onboarding speed through streamlined user flows and interactive prototyping. ✅ My full range of services. I cover a wide range of specialized design services to ensure your brand stands out. Web & Landing Pages: Landing page web design, landing page web designer, figma landing page, and wix web design. Platform Specialist: Figma website designer, squarespace website design, webflow ui ux, and elementor expert. Graphic Design: Graphic designer illustrator, logo design, motion graphic designer, social media graphic designer, and canva graphic designer. Niche Expertise: UI UX designer AI, crypto game ui ux designer, saas ui designer, and industrial designer logic. E-commerce: UI UX designer ecommerce, shopify website design, wordpress website design, and website developer collaboration. ✅ My design process: Discovery & UX Research: Understanding your product manager goals and user pain points. Wireframing & Strategy: Creating ui ux web designer blueprints and wireframes. UI UX Design & Branding: Developing the visual identity, ui graphics, and icons. Prototyping: Building figma ui ux interactive models to test user journeys. Development Support: Providing figma to html or figma to react specs for your web developer or full stack website developer. ✅ Why choose me? I am a professional UX UI designer with extensive skills in Graphic design. I create brand-aligned digital experiences, provide logo design services, and create a strong visual identity. With 25,500+ Dribbble and 9,600+ Behance followers, my work is recognized by the global design community. UI UX Designer Figma Expert: Deep knowledge of auto-layout, components, and variables. Full Stack Mindset: I work closely with website developers, virtual assistants, and facebook ads teams to ensure the design supports marketing and tech. Whether you need a UI UX designer figma, a mobile ui ux designer, or a webflow specialist, I have the experience to take your product to the next level. I specialize in UI UX designer tasks that involve product designer thinking and ux designer empathy. Ready to boost your conversions and drive business growth? Hire a professional UI UX designer today – Let’s connect! ☎️ Last updated: 03.08.2026

I Have experience creating Unreal Engine projects using C++ and Blueprints. Code i write is easy to read, scalable and meets all the proper Unreal Engine project architecture guidelines. Also have experience with blender-to-unity model/animation creation pipeline. Have some experience with OpenGL / GLFW / GLAD.