Hire the Best App Development Professionals

Are you looking for a reliable Google Play Closed Testing Specialist? Hi! I'm Md. Najmul Hassain, a Top Rated App Developer and Google Play Closed Testing Specialist. I help developers and businesses prepare their Android apps for release through Google Play Closed Testing, professional software testing, and live app feedback. With a trusted team of 12+ real testers using real Android devices, I provide structured testing, detailed live app feedback, bug reporting, and usability evaluation to help improve your app's quality and user experience before launch. I focus on clear communication, on-time delivery, and professional testing throughout every project. 🚀 My Google Play Testing Services: ✅ Google Play Closed Testing -12+ Real Testers -14-Day Closed Testing Support - Real Android Device Testing - Structured Testing Process. ✅ Professional Software Testing - Manual Testing - Usability Testing - Regression Testing. ✅ Live App Testing & Detailed Feedback - Detailed App Feedback - Bug Reporting & Analysis - UI/UX Improvement Suggestions - Performance & Stability Feedback. ✅ Google Play Console Support - Production Access Guidance - Google Play Policy Guidance - Release Preparation Support. ✅ Why Work With Me? - Top Rated Freelancer - 100% Job Success Score - Clear Professional Communication - On-Time Delivery - Reliable Testing Support. Let's work together! If you're looking for a reliable Google Play Closed Testing and Software Testing specialist, feel free to send me a message. I'd be happy to discuss your project and help you prepare your app for release।

𝗪𝗵𝘆 𝗵𝗶𝗿𝗲 𝗺𝗼𝗿𝗲 𝘄𝗵𝗲𝗻 𝗔𝗜 𝗰𝗮𝗻 𝗱𝗼 𝗶𝘁 𝗯𝗲𝘁𝘁𝗲𝗿? I work with businesses to eliminate inefficiencies through AI-driven automation, cutting costs, increasing productivity, and transforming raw data into actionable insights. 𝐇𝐨𝐰 𝐈 𝐃𝐞𝐥𝐢𝐯𝐞𝐫 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐈𝐦𝐩𝐚𝐜𝐭 𝐰𝐢𝐭𝐡 𝐀𝐈: ➤ AI Agents & Automation Design and deploy intelligent agents that streamline complex workflows, across support, compliance, finance, operations, HR, and supply chains, using LangChain, LangGraph, and tools like n8n. ➤ Multi-Agent Systems & Agentic AI Engineer cooperative AI environments capable of autonomous task execution and decision-making for large-scale business operations. ➤ RAG & Smart Knowledge Retrieval Build solutions using Retrieval-Augmented Generation (RAG) that enhance LLMs with contextual, real-time enterprise data for more accurate insights. ➤ Generative AI for Growth Develop AI tools for content generation, automated market research, and conversational bots that increase engagement and open new revenue channels. ➤ Enterprise-Ready Integrations Seamlessly connect OpenAI (GPT-4o, GPT-4, GPT-3.5), Claude, Gemini, Llama 3, and custom models into your workflows for real-world value. I specialize in full-stack AI app development and enterprise system integration. ➤ Production-Grade AI Deployment Deliver scalable, secure AI platforms using Python, FastAPI, Django, Docker, and Kubernetes—deployed on AWS, Azure, or GCP, supported by modern CI/CD practices. ✅ Why Clients Trust My Work: - Enterprise-Level Experience: I build beyond proof-of-concepts, delivering scalable, outcome-oriented AI systems. - Advanced Specialization: Deep expertise in Prompt Engineering, LLM Tuning, RAG, and AI infrastructure design. - Transparent, Impact-Driven Approach: I focus on measurable business outcomes, not just building shiny tech. - Connected to the Pulse of AI: I actively contribute to AI communities and collaborate with LangChain’s core team to stay ahead of innovation. 📂 Recent AI Projects: - Marketing: Automated campaign planning via AI-powered research and content generation. - Crypto: Developed an AI trading co-pilot to assist with smart, real-time decisions. - IT & Networking: Built autonomous agents to troubleshoot and resolve network issues proactively. - Healthcare: Created a medical AI assistant that converts patient conversations into structured EMR notes. - Construction: Engineered a system that extracts data from complex architectural and permit PDFs.

🫡 Extremely Reliable, Communicative and Fast 🥇 The Top 1% of Talent (Expert Vetted) 💰 60+ apps shipped, generating over 8 figures in revenue. ⚡ AI speed combined with 8 years of production experience to deliver code that ships fast, feels premium, and scales without cracking. (Available for 2 projects in April 2026) 🛠️ Specializing in Mobile App Development | Flutter, Swift, or React | iOS and Android 🇺🇸 Honored as a Top Mobile App Developer for hire in the United States from 2020-2025. 🏆 Award Winning Mobile App Developer: previous app featured on Apple's List of Best Language Learning Apps. 📰 Featured on Business Insider for my innovative contributions to mobile app development on Upwork. I've had the privilege of propelling clients to significant milestones, including achieving $2M in Annual Recurring Revenue (ARR). Some notable successes include: - A restaurant subscription app reaching $100K+ Monthly Recurring Revenue (MRR) - A fitness community app achieving $1.5M+ ARR. ⭐️ Client Testimonials: "Michael is a gem in the world of mobile app development..." "Among the top 3 developers I've worked with over the past three years..." "A quality developer and a quality human being..." Upwork Stats: 🏅 Top 1% of Mobile Developers 🏅 Top 1% of iOS Developers 🏅 Top 5% of Firebase Developers 🏅 Top 5% of Swift Developers 🎓 Proud Michigan State University Graduate with a Bachelor's Degree in Computer Science. With a solid eight-year trajectory as a Mobile App Developer, I've honed my skills across a plethora of projects that span iOS and Android platforms, utilizing Flutter and Swift to create high-impact applications. My forte lies in converting ideas into digital realities that propel businesses forward. From crafting engaging user interfaces to optimizing backend processes, my holistic approach ensures a robust and scalable app solution. I thrive in various development scenarios, whether its working with a team to deliver a project on a tight deadline or building an application from scratch all on my own. My experience extends to working with startups that have secured significant venture capital funding, as well as established enterprises aiming to expand their digital footprint. 🌟 Why Choose Me: Client Satisfaction: My reviews reflect the genuine value I provide. Effective Communication: I prioritize prompt and sincere interactions to ensure project fluidity. Mastery: I strive for flawless, visually appealing apps worthy of portfolio inclusion. 😁 Excited to collaborate! Whether you're a startup aiming to elevate your product or an established enterprise looking to scale, I'm here to help. Let’s kickstart our partnership with a complimentary 30 minute discussion to blueprint your pathway to success. Specialities: Full Stack Development, AI Systems Architect, AI SaaS Developer, SaaS MVP Development, Mobile MVP Development, Cross-Platform Mobile Apps, Mobile App Development, iOS Development, Scalable SaaS Architecture, AI-Powered SaaS, Flutter App Development, React Native App Development, Backend Development, Frontend Development, Mobile App Architecture, Cross Platform App Development, AI Powered Applications, API Integration, API-Driven Mobile Apps, Cloud Architecture, Production-Ready MVP, Secure APIs, OpenAI Integration, AI Workflow Automation, LLM Integration

Have an innovative app idea, a prototype, or a business platform you want to bring to life? Whether you're starting with a simple concept or already experimenting with tools like Lovable, Bubble, Replit, or n8n, I can help turn your vision into something your customers will love to use. I help founders and businesses turn ideas into AI-powered products, internal tools, and scalable software, without wasting months or tens of thousands of dollars. Client results: • $350M+ raised by clients • 2M+ users on apps I designed and developed • 10K+ five-star reviews across apps built • Top 1% in App Design & Development on Upwork A few years ago, I was sitting exactly where many of my clients are today: trying to turn an idea into an app. I was looking for freelancers, tried to build it myself and hired the wrong teams. It was a nightmare to say the least. After years of mistakes and learning to code, I finally launched SchooLinks, which grew into an Inc. 5000 company and raised over $90 million. Since then, I've helped more than 150 founders launch products across SaaS, marketplaces, AI tools, mobile apps, and internal platforms... some of which have made it to Forbes. Book your consultation today! I’ll save you months of frustration by helping you understand the ins and outs of bringing an app / platform to life: How much it costs, how long it takes, what’s the process and more. The apps I’ve built come in the form of: SaaS platforms, internal platforms, Mobile & web apps, Marketplace apps. Trusted By: Harvard, Samsung, Indeed, Yamaha, University of South Florida, and more. Technologies: OpenAI, Claude, Gemini, Flutter, Node.js, Angular, AWS, MongoDB, Figma If you’re serious about building your app the right way, let’s talk!

👋 𝗛𝗶, 𝗜’𝗺 𝗞𝗮𝘂𝘀𝗵𝗶𝗸𝗸𝘂𝗺𝗮𝗿, an expert Mobile app developer with 4+ years of experience, helping founders and businesses turn ideas into stable, well-designed iOS and Android apps. I enjoy working on products that are built to last, not rushed builds that need to be rewritten later. Most clients come to me after dealing with unstable apps, messy code, or performance issues. My focus is making sure your app is clean, reliable, and ready for real users from day one. 🛠️ 𝗪𝗵𝗮𝘁 𝗜 𝗳𝗼𝗰𝘂𝘀 𝗼𝗻 • Flutter app development for iOS & Android • Clean, maintainable, production-ready code • Firebase or Supabase backend integration • Real-time features, maps, notifications, subscriptions • App Store & Play Store compliant launches ✨ 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 & 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝘀 𝗜’𝘃𝗲 𝗪𝗼𝗿𝗸𝗲𝗱 𝗢𝗻 I’ve been involved in building mobile applications across multiple industries, which helps me quickly understand different product goals, user expectations, and technical requirements. • AI-driven mobile apps • MVP and early-stage startup products • Health, fitness, and wellness apps including meditation platforms • Social networking, community, and dating apps • Real-time chat, messaging, and calling apps • Food delivery and order-tracking apps • Travel, booking, and reservation platforms • Productivity and task management apps • E-learning and educational mobile apps • Marketplace and e-commerce apps • Real estate apps with listings and search filters • Finance and personal budgeting apps 🧑‍💻 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗮𝗻𝗱 𝗧𝗼𝗼𝗹𝘀 𝗞𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗲: • Flutter app development using Dart • Native knowledge of Swift, Kotlin, and Java • App architecture and state management with BLoC, Provider, Riverpod, and MVVM • Backend integration using Firebase, Supabase, and custom APIs • Firestore, Realtime Database, Storage, Analytics, Push Notifications, In-App Messaging, and In-App Purchases • Secure payment gateway integrations • Third-party APIs including Google Maps, Mapbox, and YouTube • Location-based features like geofencing and deep linking • Offline and local storage using SQLite, Realm, Room, and Core Data • Version control and project collaboration using GitHub, GitLab, Bitbucket, Jira, and Trello I understand the expectations of international markets and enjoy building easy-to-use applications tailored to the specific needs of clients across different industries. 📩 𝗟𝗲𝘁'𝘀 𝗧𝗮𝗹𝗸 Have an app idea or an existing one that needs fixing? Message me today and I will get back to you within 24 hours. 📞 Prefer a call? Book a free 20-minute session and I will tell you exactly what it will take to build your app the right way. 🚀 Let's build something that performs, scales, and succeeds. Let’s build a Mobile App that performs, scales, and succeeds. 🏷️Tags: Flutter Developer | Mobile App Developer | iOS App Development | Android App Development | Mobile Application Development | Cross-Platform App Development | App Developer | Flutter App Development | iOS Developer | Android Developer | UI/UX Design | Mobile App Design | Hybrid App Development | Native App Development | Mobile Application | Flutter App Developer | Cross-Platform Mobile App Developer | iPhone App Developer | Android App Developer | AI Mobile App Development | AI App Development | Firebase Integration | Firestore Database | Firebase Realtime Database | API Integration | Google Maps API | Geolocation Services | Push Notification | User Authentication | User Profile Creation | React Native | Flutter | Dart | Swift | Kotlin | Hire Mobile App Developer | Best Mobile App Developer | Top rated Mobile App Developer | Ai Mobile app developer | MVP app developer | Full stack mobile app developer | MVP app developer | MVP developer | App developer | Mobile application developer | Flutter | iOS developer | iPad app developer | Mobile application developer | Swift

𝐇𝐞𝐫𝐞'𝐬 𝐭𝐡𝐞 𝐝𝐞𝐚𝐥: Share your idea, and we’ll turn it into a functional, scalable, and beautifully designed app that solves real problems and generates revenue. 𝗛𝗼𝘄 𝗬𝗼𝘂𝗿 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗠𝗼𝘃𝗲𝘀 𝗙𝗿𝗼𝗺 𝗜𝗱𝗲𝗮 𝘁𝗼 𝗟𝗶𝘃𝗲 𝗣𝗿𝗼𝗱𝘂𝗰𝘁: Every project follows a clear, proven journey, divided into milestones: UI/UX design → Front-end development → Backend development → Deployment → Post-launch maintenance (8 weeks FREE) This ensures transparency, predictable delivery, and zero surprises. ---------------------------------------------- I offer a 𝗳𝗿𝗲𝗲 𝟯𝟬-𝗺𝗶𝗻𝘂𝘁𝗲 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝘁𝗶𝗼𝗻 to discuss and refine your idea, recommend the right tech stack, and forecast any ongoing costs as your user base grows, so you avoid surprises and make informed decision with clarity. ---------------------------------------------- Words from a recent client after working with us: (check more on my profile below) "𝙍𝙖𝙟𝙖 𝙞𝙨 𝙫𝙚𝙧𝙮 𝙥𝙧𝙤𝙛𝙚𝙨𝙨𝙞𝙤𝙣𝙖𝙡 𝙖𝙣𝙙 𝙞𝙨 𝙖𝙡𝙬𝙖𝙮𝙨 10 𝙨𝙩𝙚𝙥𝙨 𝙖𝙝𝙚𝙖𝙙 𝙤𝙛 𝙠𝙣𝙤𝙬𝙞𝙣𝙜 𝙬𝙝𝙖𝙩 𝙩𝙝𝙚 𝙗𝙪𝙞𝙡𝙙 𝙣𝙚𝙚𝙙𝙨. 𝙒𝙚 𝙖𝙧𝙚 𝙘𝙤𝙣𝙩𝙞𝙣𝙪𝙞𝙣𝙜 𝙩𝙤 𝙬𝙤𝙧𝙠 𝙩𝙤𝙜𝙚𝙩𝙝𝙚𝙧 𝙖𝙣𝙙 𝙄 𝙝𝙖𝙫𝙚 𝙖𝙡𝙧𝙚𝙖𝙙𝙮 𝙧𝙚𝙘𝙤𝙢𝙢𝙚𝙣𝙙𝙚𝙙 𝙝𝙞𝙢 𝙩𝙤 𝙤𝙩𝙝𝙚𝙧 𝙘𝙤𝙢𝙥𝙖𝙣𝙞𝙚𝙨." ⭐⭐⭐⭐⭐ - 𝘼𝙡𝙞𝙘𝙞𝙖 𝘾𝙤𝙬𝙖𝙣 𝙁𝙤𝙪𝙣𝙙𝙚𝙧 𝙈𝙚𝙨𝙢𝙚𝙧 (𝙐𝙣𝙞𝙩𝙚𝙙 𝙆𝙞𝙣𝙜𝙙𝙤𝙢) ---------------------------------------------- I've majored in software engineering, and I've used a myriad of technologies to help various businesses create mobile apps that have generated millions in revenue. Over the past 5+ years, I have developed a wide range of iOS and Android mobile apps. ✅ Food delivery app ✅ Ride booking app (like Uber) ✅ Real estate listing app (Like Airbnb) ✅ Social media mobile app (like TikTok/Instagram) ✅ Startups/Investment management mobile app ✅ Wellness mobile app ✅ Fitness and Nutrition mobile app (like CalAI, MyFitnessPal) ✅ Sports mobile app ✅ E-commerce mobile app ✅ Language Learning Mobile App (Like Duolingo) ✅ Event management mobile app ✅ Grocery/Meal Planning mobile app ✅ Freelance mobile app ✅ Service Booking Mobile App (Home/HVAC) ✅ Inventory Management Mobile App ✅ Learning Management Mobile App ✅ Appointment Booking Mobile App (Salon/Doctor) ✅ Venue Booking Mobile App (Sports/Events) ✅ Task Management Mobile App (Project Management/To-Do) ✅ On-Demand Custom Mobile Apps ---------------------------------------------- As your 𝘁𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗽𝗮𝗿𝘁𝗻𝗲𝗿, I go above and beyond to ensure your app’s success, from concept to launch. What I Also Bring Beyond Development: → Technology & architecture consulting → Product roadmap & feature prioritization → Help you understand any possible ongoing costs with the project → Cost-effective tech stack selection with long-term cost planning → Scalability strategy as your user base grows → Technical support during investor or stakeholder discussions ---------------------------------------------- 𝗠𝗮𝗶𝗻𝘁𝗲𝗻𝗮𝗻𝗰𝗲 & 𝗟𝗼𝗻𝗴-𝗧𝗲𝗿𝗺 𝗦𝘂𝗽𝗽𝗼𝗿𝘁 I provide free post-delivery support for 8 weeks, followed by flexible maintenance plans based on your product needs, usage scale, and future roadmap, always discussed transparently. ---------------------------------------------- 🚀 If you’re looking for someone who understands your product, owns outcomes, communicates clearly, and thinks long-term, let’s connect and build something solid. ❗❗ Check out my portfolio! ❗❗ Highlighted Skills: Full Stack Developer | Expert Full Stack Developer | Full Stack Mobile App Developer | Full Stack AI Developer | Expert Full Stack Mobile App Developer | Mobile Developer | iOS Developer | Android App Developer | Mobile App Development | Cross platform development | AI App Developer | AI App | Mobile Developer | App Developer | Mobile App Development Consultation | IT Consultation | App Developer | AI App Developer | iOS App Development | iOS App | Android App Development | Hybrid App development | Mobile App Development Consultation | Flutter | Firebase | Dart | Flutter Dart | Flutter Firebase | iOS Development | Android App Development | Smartphone | User Authentication | In App Purchases | API Integration