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🏆 𝐓𝐨𝐩-𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 (𝐓𝐨𝐩 𝟏𝟎%) 🏆 | 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 | 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐬𝐢𝐠𝐧 & 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐢𝐎𝐒 & 𝐀𝐧𝐝𝐫𝐨𝐢𝐝 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 | 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐂𝐫𝐨𝐬𝐬-𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝟖+ 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 I've been building mobile apps for 8 years. Mostly React Native — it's what I know well and what I actually enjoy working with. I've shipped 42+ products across a lot of different industries: marketplaces, healthcare, fintech, booking platforms, ecommerce, B2B tools. Some of them are still running and growing. I work as a Mobile App Developer, React Native Developer, and AI Developer — and these days those three things often overlap on the same project. The AI Developer side started naturally. Clients started asking for smarter apps — chat features, recommendations, content generation, search that actually works. I learned the tools, integrated the APIs (OpenAI, Claude, LangChain), and also started building full products using AI constructors and platforms where that made more sense than writing everything from scratch. Now it's a real part of what I do, not an add-on. Click Hire or Invite React Native Developer. 📱 TYPES OF MOBILE APPLICATIONS I DEVELOP • Taxi & Transportation Apps • Booking platforms • Fitness & Health Apps • AI-based mobile systems • Security-focused iOS and Android solutions • Social media and streaming platforms — social media app, live streaming app, video streaming ecosystems • Fintech & Payments Apps • E-commerce ecosystems connected with WordPress and Shopify • Business & SaaS applications • Wearables & IoT systems — WatchOS, Apple Watch, WatchKit, smart watch integrations • Delivery and Dating Apps 🫵 WHAT YOU GET ✔️ Mobile App Development for iOS and Android — cross-platform React Native builds that actually perform, not just pass review. ✔️ React Native Developer work done properly — solid architecture, clean navigation, auth, payments, push notifications, Firebase, API integration, App Store and Google Play release. ✔️ AI Developer integration — adding AI features to existing apps, or building AI-first mobile products from scratch using AI tools, constructors, and APIs. ✔️ Mobile App Design — I work in Figma, think about flows, and care about UX. Not a designer, but I know when something feels wrong and I'll say so. ✔️ Honest communication — I'll tell you what's realistic, flag problems early, and keep the project moving without needing to be chased. 🔥 WHAT I'VE ACTUALLY BUILT ✔️ 42+ apps delivered as a Mobile App Developer — from quick MVPs to multi-year product partnerships. ✔️ React Native Developer across healthcare, fintech, logistics, wellness, ecommerce, social, and B2B — most categories covered at this point. ✔️ AI Developer projects: AI integrations, AI-powered Mobile App features, and full AI app builds using modern platforms and tools. ✔️ Products that kept users: better retention, fewer drop-offs, smoother flows — that's what matters after launch. 🚚 WHERE I HELP ✔️ New Mobile App Development — MVP to production as a React Native Developer. ✔️ Existing apps — audit, rebuild, or improve what's already there. ✔️ AI Developer work — integrate AI into your app, add smart features, or build something AI-first from the ground up. ✔️ Anything cross-platform — one React Native codebase, iOS and Android, done right. 🏆 WHAT I'VE WORKED ON ✔️ Marketplace apps — listings, search, chats, bookings, payments, reviews, maps, admin panels. ✔️ Healthcare and wellness — onboarding, profiles, appointment flows, reminders, HIPAA-aware builds. ✔️ AI-powered products — AI Mobile App Development with real features: chat, recommendations, smart search, content generation. ✔️ Ecommerce and subscriptions — In-App Purchases, product catalogs, checkout flows, retention mechanics. ✔️ Business tools — role-based dashboards, approvals, reports, notification systems. ⚒️ HOW I WORK ✔️ React Native is my primary tool as a Mobile App Developer. I know it well, I use it daily, and I don't oversell what it can or can't do. ✔️ As an AI Developer I pick the right approach for the project — sometimes that's an API integration, sometimes it's an AI constructor, sometimes it's a lightweight custom build. ✔️ Firebase, Node.js, REST APIs, User Authentication, In-App Purchases — the backend side is covered. ✔️ I'm involved from discovery to release. I'll ask the questions that matter early so we don't redesign things at the end. ✔️ After launch I'm available — bugs, improvements, new features, whatever comes next. 📩 READY TO START ASAP

🥇 Top Rated Freelancer on Upwork 🥇 5 plus Years of Experience in Manual QA 🥇 Full coverage Manual QA for Web and Mobile products, including API validation 🥇 Clear, developer friendly test documentation and bug reports 🥇 Smooth cooperation in remote teams and Agile workflows Performing such types of testing ✅ Manual ✅ Exploratory ✅ Functional ✅ System ✅ Regression ✅ Smoke ✅ UI and UX testing ✅ Cross browser and compatibility testing ✅ API testing Also have hands-on experience with Test Automation 🤖 Automation QA (AI-assisted): built and maintained automated test scripts leveraging AI tools (Claude, ChatGPT) to accelerate script writing, debugging, and maintenance, combining manual QA expertise with modern AI-powered automation workflows Experienced in Reviewing requirements and clarifying acceptance criteria before testing starts Creating practical test scenarios and test cases based on real user behavior Reporting bugs with clear reproduction steps, expected versus actual results, and evidence Supporting fast release cycles by verifying fixes and running regression before production Working closely with developers and product leads to reduce regressions in complex workflows Technical expertise in Manual QA includes 🔎 Management tools: Jira, Azure DevOps, TestRail, Trello, Confluence, Asana 🔎 API testing: Postman, Swagger 🔎 Debugging: Datadog, Splunk, Amplitude 🔎 Cross browser testing: BrowserStack, LambdaTest 🔎 Databases: basic SQL, PostgreSQL 🔎 Remote collaboration: clear async updates and structured status reporting 🔎Mobile testing: TestFlight, Google play, Firebase, Appstore connect I have worked with SaaS style products and workflows where many objects and calculations depend on each other, so I test not only isolated features but also system behavior and edge cases. I will be glad to help your team ship stable releases that meet business needs and feel reliable for users. Feel free to message me and share your product scope. QA Tester, Manual QA, Software Quality Assurance, Web and Mobile Testing, SaaS QA, Functional Testing, Exploratory Testing, Regression Testing, Smoke and Sanity Testing, End to End User Flows, UI and UX Testing, Responsive Design Testing, Cross Browser Compatibility, iOS and Android App Testing, UAT Support, Release Verification, Production Checks, Bug Reporting, Defect Triage, Repro Steps, Test Cases and Checklists, Test Plan, Acceptance Criteria Review, Requirements Validation, Edge Case Coverage, API Testing, REST API Validation, Postman, Swagger, Chrome DevTools, Network Logs, HAR Capture, SQL Queries, PostgreSQL, Salesforce QA, SOQL, Stripe Payments Testing, Webhook Validation, Analytics Tracking Validation, Amplitude, Jira, TestRail, Confluence, Azure DevOps, Trello, BrowserStack, LambdaTest, TestFlight, Firebase, App Store Connect, Remote Testing, Azure Virtual Machines, AnyDesk, Localization QA, Content QA, Data Integrity Checks, Calculation Validation, Session Based Testing, Agile QA, Sprint Testing, Automation QA, Test Automation, AI Assisted Test Automation, Automated Test Scripts, Script Maintenance, Low Code Automation, AI Powered QA Workflows

Need one developer who can take your whole product off your hands, from the database to the desktop UI to the game? That's what I do. I'm Aleksandr, a C#/.NET developer with 2 years of experience and 20+ delivered projects. I work across the entire .NET ecosystem: 🖥 Desktop (Windows): WPF, WinForms, Avalonia, MAUI. Complex UIs, MVVM, DevExpress/Telerik, hardware & legacy-system integration, migration of old apps to modern .NET. 🌐 Backend: ASP.NET Core (Web API, gRPC, SignalR), Entity Framework Core, microservices, SQL Server/PostgreSQL, Redis, Docker, Azure/AWS. 💻 Web frontend: Blazor (Server & WebAssembly), plus TypeScript/React when the project calls for it. 🎮 Unity: gameplay programming, tools & editor extensions, mobile and PC titles, AR/VR prototypes. Why clients hire me and come back: • I write maintainable code: clean architecture, unit tests, documentation. Your next developer will thank you. • I communicate like a partner, not a contractor: daily updates, honest estimates, and I'll point out a cheaper solution when one exists. • I own problems end to end. "It works on my machine" is not something you'll ever hear from me. Whether you need to fix a stubborn bug, rescue a project that's behind schedule, or build something new from scratch, send me a message. I reply within a few hours, and you'll get an honest assessment of your task even if we don't end up working together.

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