Hire the Best App Development Freelancers
in Ukraine

Full Stack Developer | 5M software End-Users Impacted | $200K+ Total Earnings | Expert-Vetted (Top 1% Upwork) | 31 Projects | 100% Job Success | 12+ Years on Upwork | 5339+ Hours Worked | TOP RATED PLUS – Top 3% of companies | 16+ Countries Covered 🙈 “Can we just quickly fix this?” 🙊 “It’s probably just a small change.” 🙉 “Let’s ship first and think later.” I am a CEO and Business Manager at Peppernode. I create systems where architecture and decisions matter because mistakes cost more than doing it right. Call me Illia. 🏆 MY ACHIEVEMENTS: 15+ years and 30+ successful products as a Full Stack Developer, delivering SaaS platforms, MVPs, AI-powered solutions, scalable Web Applications; 12K+ dental professionals and 20K+ healthcare users supported through Healthcare Web Applications and HIPAA-compliant platforms built as a React Developer; 35–45% faster feature delivery, improved application stability, and scalable SaaS platforms built as a React Full Stack Developer; 20–30% higher user engagement as a React Developer, building web applications used by 5M+ end users worldwide. React Native App Developer delivering cross-platform mobile apps. Python Developer building scalable backend systems and APIs for SaaS products; 31 successful projects delivered to businesses across 16+ countries, serving more than 5M+ end users worldwide; 100% Job Success, $200K+ earned, and 5,339+ hours worked on Upwork, with proven experience designing scalable applications, validating product strategies, and making the right technical decisions from day one. 🚀 SaaS Development As a Full Stack Developer React, I build 30+ modern SaaS platforms with React, Python, Firebase, and scalable architectures. As a React Developer Firebase, I've delivered 20+ SaaS projects, building web applications with connected frontend and backend systems. 📱 React Native App Development As a React Native Developer and React Native App Developer, I build cross-platform applications for iOS and Android. I've delivered 20+ React Native Mobile solutions for startups and established businesses, focusing on performance, reliability, and long-term scalability. As a React Native Developer Expo specialist, I take products from MVP to production, building intuitive user experiences with clean, scalable codebases. As a React Native App Developer, I've built mobile applications used by businesses in 10+ countries. As a Full Stack Developer React Native and Mobile Developer, I've contributed to 20+ mobile products, building connected mobile ecosystems powered by scalable backend services. My work includes React Native, Expo, mobile MVP development, enterprise applications, API integrations, authentication, App Store and Google Play releases, performance optimization, and long-term product support. 🍽 Restaurant Ordering Systems As a Full Stack Developer React, I've built restaurant ordering systems serving thousands of daily users, helping restaurants automate ordering and payments. My solutions have improved operational efficiency by an average of 32% through workflow automation, POS integrations, and real-time order management. As a React Native Mobile Developer, I've developed customer and staff applications that streamline restaurant workflows. As a React Developer and Python Developer, I build reliable restaurant platforms with scalable architectures, secure payment integrations, POS connectivity, inventory synchronization, cloud-based backend services, and high-performance APIs. 📌 Existing Product Modernization As a Full Stack Developer React, I've modernized 20+ existing applications, refactoring unstable codebases, reducing technical debt, and expanding functionality without sacrificing maintainability. 🤖 AI Integrations As a Full Stack Developer AI, I've built 20+ AI integrations using OpenAI API, Gemini, and LangChain, helping businesses add intelligent capabilities. My work includes AI-powered features, conversational chat interfaces, workflow automation, RAG pipelines, AI agents, prompt engineering, and custom LLM integrations that improve productivity and user experience. 🔧 Tech Stack Every successful product starts with discovery, business analysis, architecture, and product strategy. As a Full Stack Developer React Node and Python Full Stack Developer, I've delivered 31 production-ready software products using modern web echnologies. My frontend stack includes React, React Native, Expo, TypeScript, JavaScript, HTML5, CSS3, Tailwind CSS, Next.js As a Python Full Stack Developer Flask specialist, I build scalable backend systems for 5M+ users with Python, FastAPI, Django, Node.js, REST APIs, PostgreSQL, MySQL, Firebase Looking for a React Developer, React Native Developer, Full Stack Developer React Node, or Python Full Stack Developer to build your next SaaS platform, web application, mobile app?

Need a custom LMS, a high-performance mobile app, or a rock-solid SCORM/xAPI integration? As a full stack developer and web developer specializing in EdTech, I bridge the gap between complex eLearning backends and seamless cross-platform app development. With 9+ years of hands-on experience, I focus exclusively on educational technology and LMS platforms. I don’t just build software; I deliver compliant, scalable ecosystems that combine powerful web architecture with intuitive mobile app experiences for iOS and Android. Through my partnership with Greenice (Top Rated Plus agency), I offer unique scalability. I can handle solo elite development or bring in a full-cycle engineering team (UI/UX, QA, DevOps) depending on your project size. ⚡ What I Can Build & Fix For You: • Mobile App Development: Cross-platform iOS & Android deployment using react native or Flutter, featuring advanced offline mode, interactive push notifications, and mobile-first learning UI. • Web Developer & LMS Portals: Robust backends (Laravel, Node.js) featuring custom course builders, assessments, automated reporting, user roles, and CRM/HR/SSO integrations. • eLearning Standards Compliance: Flawless implementation and debugging of SCORM 1.2 / 2004, xAPI (Tin Can), LTI, and OAuth2 secure authentication. • Interactive & Gamified Content: Custom learning players, microlearning modules, and real-time analytics dashboards. 🛠️ Core Tech Stack & Expertise: • Mobile App Development: react native, flutter developer tools, iOS & Android deployment • Web Developer & Frontend: React, JavaScript, TypeScript, TailwindCSS, Responsive Web • Full Stack Developer Backend: Laravel, Node.js, PostgreSQL, MySQL, Redis • EdTech Protocols: SCORM, xAPI, LTI, REST APIs Let's turn your educational vision into a scalable product. Message me to discuss your project requirements or to schedule a technical consultation!

If you’re building a mobile app or improving an existing one, I design clear UX and high-quality UI that help your product feel simple, structured, and ready to scale. I focus on turning ideas into intuitive mobile experiences with clean visual systems and strong product logic behind them. Also I help you: ✅ Build clear and intuitive mobile user flows ✅ Design clean, consistent, high-quality UI ✅ Create a scalable design system for future growth And solve problems like: 🚫 Users getting confused or dropping off 🚫 Low conversion to paid plans 🚫 Inconsistent screens and messy structure 📦 What you get: • Clear product structure (entry → key action → outcome) • 1 complete mobile workflow based on your core use case • 15–20 polished screens with all necessary states • Interactive Figma prototype for testing and handoff • Structured mobile UI system (components, tokens, typography) 🕒 Timeline: • 7–10 business days for one complete workflow (With assets provided and consistent feedback.) 🎁 Bonus: • App icon (store-ready formats) • 3–5 launch-ready App Store / Google Play screenshots My Process If you’re not sure how to structure your product, I guide you through it. We start with clarity: goals, users, and core logic. Before scaling everything, we align on a key screen and main flow. Once direction is confirmed, I build out the full system structure, screens, and consistency. You stay focused on your business while I handle the UX logic and UI foundation. You receive clean, organized, developer-ready files and clear communication throughout. After delivery, I provide 7 days of support to ensure smooth implementation. 🤝 Guarantee We align on direction early. If the first key screen doesn’t match the agreed style and product goals, I refine it until it does at no extra cost. Available to begin immediately. ✅ Mobile app UX design (iOS / Android) ✅ Structuring mobile products and user flows ✅ Mobile interface prototyping (Figma) ✅ Creating scalable mobile design systems ✅ App Store / Google Play design assets ✅ Developer-ready files

I'm an AI Product Engineer with a focus on helping startups and businesses leverage AI and adapt to the modern software industry, which is now more accessible than ever. That includes full-stack development, AI automation, AI integration, prototyping, custom development, and, of course, taking over what you've already built and turning it into a production-grade solution. 𝐁𝐫𝐢𝐧𝐠 𝐢𝐧 𝐲𝐨𝐮𝐫 𝐩𝐫𝐨𝐭𝐨𝐭𝐲𝐩𝐞 𝐛𝐮𝐢𝐥𝐭 𝐰𝐢𝐭𝐡 𝐀𝐈 𝐚𝐧𝐝 𝐈'𝐥𝐥 𝐭𝐮𝐫𝐧 𝐢𝐭 𝐢𝐧𝐭𝐨 𝐚 𝐩𝐫𝐨𝐟𝐢𝐭𝐚𝐛𝐥𝐞 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧! 𝐈𝐟 𝐲𝐨𝐮'𝐫𝐞 𝐧𝐨𝐭 𝐬𝐮𝐫𝐞 𝐚𝐛𝐨𝐮𝐭 𝐲𝐨𝐮𝐫 𝐢𝐝𝐞𝐚, 𝐣𝐮𝐬𝐭 𝐬𝐞𝐧𝐝 𝐦𝐞 𝐲𝐨𝐮𝐫 𝐛𝐚𝐬𝐢𝐜 𝐬𝐩𝐞𝐜𝐬 𝐨𝐫 𝐑𝐅𝐏, 𝐚𝐧𝐝 𝐈'𝐥𝐥 𝐭𝐮𝐫𝐧 𝐢𝐭 𝐢𝐧𝐭𝐨 𝐚𝐧 𝐀𝐈 𝐩𝐫𝐨𝐭𝐨𝐭𝐲𝐩𝐞 𝐰𝐢𝐭𝐡𝐢𝐧 𝟑𝟎 𝐦𝐢𝐧𝐮𝐭𝐞𝐬 𝐚𝐭 𝐧𝐨 𝐜𝐡𝐚𝐫𝐠𝐞. 𝐅𝐨𝐫 𝐦𝐞, 𝐢𝐭'𝐬 𝐣𝐮𝐬𝐭 𝟑𝟎 𝐦𝐢𝐧𝐮𝐭𝐞𝐬 𝐨𝐟 𝐰𝐨𝐫𝐤. 𝐅𝐨𝐫 𝐲𝐨𝐮, 𝐢𝐭'𝐬 𝐚 𝐠𝐫𝐞𝐚𝐭 𝐰𝐚𝐲 𝐭𝐨 𝐯𝐚𝐥𝐢𝐝𝐚𝐭𝐞 𝐲𝐨𝐮𝐫 𝐢𝐝𝐞𝐚 𝐛𝐞𝐟𝐨𝐫𝐞 𝐢𝐧𝐯𝐞𝐬𝐭𝐢𝐧𝐠 𝐟𝐮𝐫𝐭𝐡𝐞𝐫. 🔐 𝗞𝗲𝘆 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: 1. AI Automation: streamlining workflows and business processes with AI 2. AI Prototyping: building fast, working proof-of-concepts to validate ideas 3. AI Hardening: taking over existing solutions and bringing them into production 4. Full-Stack Development: end-to-end product development, from frontend to backend 🌠 My background is in custom software development, and I spent a while working as a hands-on engineer. I was lucky enough to spend my entire career working with fast-growing, large-scale, and enterprise clients, representing an outsourcing vendor. 🌌 Apart from development activities, I was engaged in many others: interviewing engineers, participating in pre-sales, training programs, leading and driving development processes, and much more. I was always a company guy and was interested in and open to everything. 👴🏻 That’s where I matured as an engineer. I learned a lot along the way, saw how painful the software development process could be, and understood the pros and cons of different organizations, including where Fortune 100 companies struggle. 📺 I’m a professional engineer focused on delivering business outcomes for you — not a part-time freelancer juggling Upwork with a full-time job or doing it for extra income. I'm working with all types of clients and budgets. ✅ 99% Job Success Score; 100 + projects delivered — from idea to production-ready software 🛡 Expert-Vetted — interviewed and approved by the Upwork team 🚀 Fastest-Growing Upwork Profile Globally — $4M+ earned across multiple profiles since 2022 🌍 Most Recognized & Viewed Upwork Profile Worldwide 💰 Scaled 5 Upwork Profiles to $300K+ revenue each with strong inbound leads 🏢 Delivered Projects for Fortune 100 & Inc. 5000 Companies and UAE government 🧠 Led Pre-Sales, Estimations, Code Reviews & Tech Interviews for top-tier clients 💻 Even if we don’t end up working together, I’ll help you identify risks and guide you on how to make the product happen — because in the end, it’s all about mindset, not just coding skills. 💡 Answering a question how am I different in this competitive AI industry — the answer is simple: mindset. You can learn endless frameworks, libraries, languages — alright, cool, but mindset and deep understanding of this world outside and inside the industry is what really makes a difference. 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: AI Automation, AI Agents, Agentic AI, LLM Integration, OpenAI API, Claude API, Gemini API, RAG, Vector Database, AI Chatbot Development, AI Assistants, Workflow Automation, Business Process Automation, MCP (Model Context Protocol), Multi-Agent Systems, Prompt Engineering, Full Stack Development, Full Stack Developer, Web Application, SaaS Platform, MVP Development, React, Next.js, Node.js, TypeScript, REST API, API Integration, PostgreSQL, MongoDB, Authentication, User Management, Admin Dashboard, Backend Services, Payment Integration, Stripe Integration, Subscription Management, Role-Based Access, Scalable Applications, Production-ready, Performance Optimization

I specialize in WordPress Website Development and Custom WordPress Development & Design for businesses that need a fast, scalable, and conversion-focused WordPress Website. My work combines WordPress Website Design, Custom WordPress Website Development, Website Development, performance optimization, SEO structure, and clean content management. I don’t just build pages. I help turn a WordPress Website into a working business asset that generates leads, sales, and long-term value. My ideal flow: Idea → Discovery → Prototype → Design → Development → Testing → Launch → Support. 12+ Years on Upwork $600K+ Total Earnings 200+ Satisfied Clients 200+ Completed Jobs 100% Job Success Score Top Rated Plus Freelancer “Dmitry is always solution orientated and a clear communicator. He is committed to the quality of the project and is very detail oriented. He is always held accountable for outcomes.” Client review For most clients, WordPress Website Development is not just about building pages. Good WordPress Website Development should include structure, speed, usability, SEO basics, and easy content management. My approach to WordPress Website Development is practical: first I understand the business goal, then I plan the content structure, then I handle design, development, testing, launch, and support. That is why my WordPress Website Development process often includes Custom WordPress Development, WordPress Website Design, Website Redesign, WooCommerce, Elementor, ACF, and performance optimization. I am a WordPress Developer, WordPress Website Expert, and Web Developer focused on Custom WordPress Development, WordPress Website Design, WordPress Elementor, WooCommerce, Website Redesign, Website Customization, WordPress Website Optimization, and WordPress SEO. Typical work includes: WordPress Website Development Custom WordPress Website Development Custom WordPress Development WordPress Website Design WordPress Design WordPress Elementor development WooCommerce and Ecommerce Website development Website Redesign Website Customization WordPress Website Optimization WordPress SEO structure ACF, flexible content, and custom admin systems Custom themes and WordPress Theme development WordPress Plugin customization API integrations with CRMs, marketing tools, payment systems, and automation platforms Front-End Development with HTML, CSS, JavaScript, and PHP Most of my projects go beyond standard brochure sites. Clients usually come to me when their current WordPress Website is slow, hard to manage, difficult to scale, or not converting visitors into leads and customers. Some projects require Custom WordPress Development with ACF, Options Pages, flexible content blocks, structured page systems, custom post types, and clean admin logic. Others need WooCommerce functionality, subscriptions, custom checkout flows, payment logic, product structures, or integrations with third-party platforms. From the design side, I focus on WordPress Website Design that supports real business goals: clear user flow, strong content hierarchy, responsive layouts, conversion-focused sections, and SEO-friendly structure. I also work on Website Redesign projects where the existing site already has traffic, but the design, performance, structure, or user experience is holding it back. In those cases, I rebuild the WordPress Website with better UX, better speed, better SEO structure, and easier content management. A large part of my work is built with WordPress Elementor when clients need speed, flexibility, and easy editing. For more complex projects, I use Custom WordPress Development instead of relying only on builders. My projects often include Custom WooCommerce functionality, Core Web Vitals optimization, large WordPress Websites, multi-language and multi-site structures, advanced ACF usage, Gutenberg blocks, API integrations, plugin conflict debugging, server-level fixes, and responsive Front-End Development. At the core, every project combines three things: WordPress Website Development, WordPress Website Design, Custom WordPress Development. Not as separate services, but as one system that impacts revenue, user behavior, speed, search visibility, and long-term scalability. I work as a WordPress Developer and WordPress Designer for WordPress Website, WordPress Development, Elementor, WooCommerce, SEO, Website Design, Web Development, and conversion-focused builds. If you are looking for a WordPress Website Developer, WordPress Development Expert, Web Developer, or Website Design partner who can handle both design and development, I can help you plan, build, optimize, and support your WordPress Website from idea to launch.

• Senior UI/UX Designer with 10+ years of experience designing web and mobile products, SaaS platforms, dashboards, CRM systems, e-commerce solutions, and landing pages. • Top Rated Plus freelancer on Upwork with $100K+ earned, 90+ completed projects, and experience working with startups, agencies, and international clients. • Skilled in the complete product design lifecycle, from market research and competitor analysis to wireframing, prototyping, design systems, and high-fidelity UI design. Experienced in leading design teams, mentoring designers, and collaborating closely with developers, stakeholders, and product teams. 📌 I can help in: • UI/UX design • Web App Design / SaaS platform design • Dashboard design / CRM Design / Admin panel design • Landing pages design • Design System • Multi-page websites design • Mobile App Design (iOS design/Android) • Data Visualisation • Ecommerce design • Design System 📌 Design process: • Market research, discover existing competitors • Find out users’ pains, create user personas, user flows • Suggest the best ideas to create quality product • Wireframing and prototyping • Create intuitive and clean interface 📌 Tools I use: • Figma • Adobe After Effect • Adobe Photoshop • Adobe Illustrator • ChatGPT – research, UX analysis, content structuring, brainstorming, and design exploration • Midjourney, Krea, Higgsfield – image generation • Kling and OpenArt – video generation 📥 Let’s Connect! Thank you for taking the time to read this! I’m available and responsive 7 days a week. If you think we’d make a great team, feel free to hit the message button in the top-right corner, and let’s get started! 🔑 Keywords UI/UX Designer, Website Designer, Landing Page Designer, Mobile App Designer, Figma Designer, User Interface, User Experience, Android Designer, iOS Designer, Professional Designer, Website Redesign, Mobile App Redesign, Dashboard Designer, Dashboard Redesign, Responsive Website Designer, SaaS Designer.