Hire the Best App Development Freelancers
in Ukraine

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

Hi! I'm an experienced mobile developer ready to create an Android application of any complexity for you. I do my work conscientiously and pay great attention to detail. I believe that great apps shouldn't break the bank. That's why I offer professional, high-quality development for a great price. My core strength is native Android (Kotlin/Java), but I also use modern tools like Kotlin Multiplatform for efficient Android & iOS development. Additionally, I can handle native iOS projects (Swift/UIKit) and game development in Unity and Godot. 🔗 Check out my apps on Google Play: play.google.com/store/apps/developer?id=elfenlied 🔗 See my profile on Freelancehunt: freelancehunt.com/freelancer/ukinari.html 💻 Core Specialization: Android Development Languages: Kotlin, Java User Interface (UI): Jetpack Compose, Android SDK (XML Layouts) Architectural Patterns: MVVM, Clean Architecture Core Libraries: Coroutines, Retrofit 🚀 Additional Skills & Expertise Cross-Platform Development: Kotlin Multiplatform (KMP) iOS Development: Swift (UIKit) Game Development: Unity, Godot Engine 🛠️ Technologies & Libraries Data Management: Room, SQLDelight, SQLite, Firebase Realtime Database Networking: Ktor, Retrofit2, RESTful API Cloud Services: Firebase (Authentication, Cloud Storage ...) Tools & Version Control: Android Studio, Xcode, Git, GitHub Project Management: Trello, Google Keep Ready to start your project? Send me a message, and let's build an amazing application together!

Your application can get successful and raise up to 1M users and more. Yoy will never get into endless development. You'll get clear communication, professional support and constant collaboration. Responsibility, creativity, thinking over the code to whole project and making things done. I’m Olex, your full stack developer with 12+ years of programming experience and 8+ of in full stack development experience. I always think about my clients needs first and always share my ideas or doubts about a project I make. I'm honest and fair. I'm confident and I'm actively using AI in my work that helps me to fasten my work up to 20%. Why Choose Me as Your Full Stack Developer? ✅ 8+ years of mobile + back-end development experience ✅ 30+ created full stack systems ✅ 50+ succesfully finished projects on Upwork ✅ 20+ 5-star ratings and glowing client reviews on Upwork ✅ 10+ returning clients ✅ Ranked among the top 10% of Mobile App Developers ✅ End-to-end support from concept to release ✅ AI-powered full stack developer: applications that invokes LLM API integration to provide intelligent, interactive, and context-aware mobile solutions What my client say ⭐️ Oleksii demonstrated himself as a true professional: his deep knowledge and expertise were evident in every response. He not only thoroughly analyzed all aspects of the project but also suggested many valuable ideas I hadn’t even considered. ⭐️ Alex is great. Approaches all tasks by looking at the big picture and working through details with intelligence. Alex helped is get three Apps to production on both iOS and Google Play. Couldn't have done this without him. ⭐️ I’m delighted to share my enthusiasm for working with Alex. From the very beginning of our collaboration, he has demonstrated himself as a professional with a high level of responsibility. Communication with him was extremely comfortable: Alex was always available to discuss issues and responded promptly to messages. ⭐️ Oleksii has it all - incredible work, a strong conviction, incredibly insightful and communicative to problem solving. Could not recommend him more ⭐️ Excellent communication skills. The task was completed on time. My Tech Stack as Full Stack Developer: • Mobile App Languages: Swift, SwiftUI, Objective-C, Kotlin, Java, Flutter, React Native • Web App Applications (RWA): React • Back-end & Web Languages: Javascript, Python, PHP • Back-end integration: Node.js, FastAPI, Lavarel, Firebase, AWS, Supabase • Integrations: APIs, Payment Gateways, Push Notifications, In-app purchases, BLE devices • Approach: Agile Development CI/CD • A Full-stack & Mobile App Developer with deep understanding of mobile ecosystems and experience Core Expertise as a Full Stack Developer: • iOS & Android Mobile App Developer • React web developer • Back-end Node.js, Lavarel & FastAPI Developer • Streaming & Media – real-time video & audio • AI - integrating modern AI APIs, prompt engineering What You Get Working With a Dedicated Mobile App Developer: ✅ Native or Cross-platform apps optimized for speed, stability, and scalability ✅ Web RWA appls optimized for speed, stability, and scalability ✅ Expert-level integrations with IoT, APIs, sensors, and wearables ✅ Clear, consistent communication and progress tracking ✅ Back end implemented by specific case or task with high-load optimisation ✅ Solutions that count in and reduce to zero security risks ✅ Architecture designed for future growth and long-term success 🙌 Let’s talk about your project more deeply and crack the rock together. Click "Invite to Job" or "Hire Now" to start making great smooth and successfull applications!

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!

🎯 UI design is what users see. UX design is what users feel. A UI UX Designer is the one who knows how to combine both and turns your complex ideas into intuitive digital products. 💎 As a Top Rated Plus Mobile App UI UX Designer with 10+ years of experience in Web and Mobile App Design, I specialise in crafting product design solutions that always prioritise users' needs and drive business success. Over the years, I have worked on 150+ Mobile App Design and Web App Design projects, with a strong focus on simplicity, clarity, and usability, delivered through high-fidelity designs in Figma. I CAN HELP YOU WITH: 📱 Mobile App Design: creating intuitive and engaging mobile app mockups (iOS, Android, cross-platform) used by 10k+ users. 💻 Responsive Website and Web App Design: designing websites that look and work perfectly across 3+ screen sizes and devices. 📊 User flows & wireframes: planning and structuring your project to ensure a seamless user journey. 🔄 Interactive prototypes: turning your ideas into high-fidelity Figma prototypes ready for development handoff. 🧪 Usability testing: ensuring your product is user-friendly and effective through structured testing and feedback. 🔍 UI UX Audit: analysing and improving existing products with a keen eye for detail to enhance usability and user experience, with clear action points. 7 KEY INDUSTRIES I'VE WORKED WITH: 🏥 Health & wellness: UI UX Mobile App Design for fitness and coaching apps with 1k+ active users. 💳 Financial services: secure dashboards and responsive Web Designs for fintech platforms handling complex data. 🏠 Home services: apps for home inventory and maintenance management. 🚙 Automotive: engineering web & mobile apps with charts and data visualisations. 📱 Education: language learning and notification-based mobile learning apps used daily. 🚀 Technology: SaaS products and tech dashboards with scalable design systems. 🛍️ E-commerce: optimised online stores and checkout experiences in Figma that improve conversions by simplifying user flows. YOU CAN EXPECT: 🤝 100% responsibility on my part. We'll stay in touch throughout the project as one close-knit team working towards one main goal. 🔍 15+ precise and clear questions about your business/product. I ask all the questions to make sure time is always spent in the right direction. 📈 The best result will be achieved. I always care about the end result and do my best to help my clients maximise their results. A FEW CLIENT REVIEWS: ✅ "I have worked with Valentyna for over 18 months now, and from day one she has felt like a cofounder. She is exceptionally talented, with outstanding communication skills that make collaboration effortless and a reliability you can always count on. Beyond her role as UX and mobile app design lead, she has taken ownership of our user engagement strategy, setting up and managing our platforms across Mixpanel and Customerio. She is a genuine pleasure to work with every day." ✅ "Incredibly good freelancer. One of a kind in her skills and in kindness. You want to work with a professional who can demonstrate their value in such engagements but when you bump into someone like Valentyna, you feel blessed. Knowledgeable freelancer, clear communication, set right expectations, great input along the way and very respectful of my workstyle. Kudos to her! After few days of working, I basically put her in the driver seat and cruise along. She is that good and I would strongly recommend anyone who is looking for a web designer. And this is not ending here. More work to be awarded to her in the coming days and me, so I can remain in the backseat and let her run the projects. A++ !!! is how I want to end my feedback." ✅ "Valentyna is great professional. I needed to take my mock-ups to a full MVP design for a mobile app. She not only did so, but provided several iterations and alternative versions for me to chose from. Would absolutely recommend Valentyna!" ✅ "I have worked with Valentyna on several projects across two different companies. She does great work, asks the right questions, works independently and delivers quickly. I will definitely hire her for jobs in the future." Are you ready to turn your project into a successful product with the assistance of an experienced UI UX Designer? I'm excited to discuss your Web or Mobile App Design project and how we can make it succeed together. Send me an invitation to an interview and let's start the ball rolling. 🙌

📈 My last landing page increased conversions by 60% in the first month. A healthcare monorepo app I optimized now loads 3x faster and reduced bugs by 70%. 100% Job Success | ⭐⭐⭐⭐⭐ Feedback | Clients keep coming back for more 🧑‍💻 4+ 𝘆𝗲𝗮𝗿𝘀 of proven experience building fintech, landing websites, SaaS, and healthcare products. Clients value me for speed, proactive communication, and results that require minimal revisions. ⭐️ Max Prosperi: "⭐⭐⭐⭐⭐ Nicholas (Mykola) jumped into a complex codebase with minimal onboarding and delivered high-quality work at impressive speed. Clear communication, thoughtful commits, reliable delivery." ⭐️ Aleks Zimak: "⭐⭐⭐⭐⭐ Nicholas (Mykola) quickly turned complex Figma designs into clean, responsive code. His proactive approach, attention to detail, and fast delivery made collaboration seamless. Highly recommend!" ⭐️ Ilan Cohen: "⭐⭐⭐⭐⭐ "Excellent freelancer! I worked with Mykola on securing my website access, as I had a mess between Github, servers, Lovable access, and more. Mykola reordered everything very quickly, and thanks to him, I can work again on my site!" 🛠 What I deliver: • Responsive SPAs & dashboards from Figma • SEO-ready Next.js apps (App Router) • Cross-platform mobile apps (React Native) • Fintech/Web3 integrations (Stripe, EexSwap, EexWallet) • APIs, authentication, WebSockets, analytics • Clean code, tests, error handling & i18n 📌 Workflow: 1. Requirement analysis & consultation 2. UI/UX implementation with clean code 3. Development in scalable architecture 4. Weekly updates & proactive feedback 5. Testing, optimization & deployment 🔥 If you need a reliable frontend partner with proven results — click "𝗜𝗻𝘃𝗶𝘁𝗲" on my profile, and let’s build something great. Best regards, Mykola S. Front-End Development React, Front-End Development Next.Js, Front-End Development TypeScript, Front-End Development JavaScript, Front-End Development Tailwind CSS, Front-End Development Chakra UI, Front-End Development MUI, Front-End Development Mantine, Front-End Development Shadcn UI, Front-End Development Ant Design, Front-End Development Bootstrap, Front-End Development Responsive Design, Front-End Development Landing Pages, Front-End Development Dashboards, Front-End Development Admin Panels, Front-End Development SaaS Apps, Front-End Development Fintech Apps, Front-End Development Web3 Apps, Front-End Development Healthcare Apps, Front-End Development Time Tracking Apps, Front-End Development Multilingual Websites, Front-End Development i18next, Front-End Development Accessibility, Front-End Development SEO-Ready Apps, Front-End Development Server-Side Rendering, Front-End Development Static Site Generation, Front-End Development App Router Next.Js, Front-End Development State Management, Front-End Development React Query, Front-End Development Redux Toolkit, Front-End Development Zustand, Front-End Development Context API, Front-End Development Authentication, Front-End Development JWT Auth, Front-End Development NextAuth.Js, Front-End Development API Integration, Front-End Development REST API, Front-End Development GraphQL, Front-End Development Supabase, Front-End Development Firebase, Front-End Development PostgreSQL, Front-End Development MongoDB, Front-End Development Prisma ORM, Front-End Development MySQL, Front-End Development Real-Time Apps, Front-End Development WebSocket, Front-End Development SocketIO, Front-End Development Stripe Integration, Front-End Development Payment Gateway, Front-End Development Subscription Billing, Front-End Development Crypto Wallet, Front-End Development E-Wallet, Front-End Development Blockchain Frontend, Front-End Development Smart Contracts, Front-End Development dApp UI, Front-End Development Fintech Multicurrency, Front-End Development Data Visualization, Front-End Development Recharts, Front-End Development Chart.Js, Front-End Development Analytics Dashboards, Front-End Development Reports System, Front-End Development Jest Testing, Front-End Development Cypress Testing, Front-End Development React Testing Library, Front-End Development Unit Testing, Front-End Development E2E Testing, Front-End Development Error Boundaries, Front-End Development Performance Optimization, Front-End Development Lighthouse Optimization, Front-End Development Lazy Loading, Front-End Development Image Optimization, Front-End Development CDN Integration, Front-End Development AWS EC2, Front-End Development Vercel, Front-End Development Netlify, Front-End Development CI/CD GitHub Actions, Front-End Development Monorepo Nx, Front-End Development Turborepo, Front-End Development Module Federation, Front-End Development Framer Motion, Front-End Development Mobile Apps, Front-End Development React Native, Front-End Development Expo, Front-End Development Tamagui, Front-End Development React Navigation, Front-End Development Cross-Platform Apps, Front-End Development App Store, Front-End Development Google Play, Front-End Development