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Based on 200 client reviews
John Willie D.

Fort Lauderdale, Florida

$25/hr
5.0
7 jobs

I'm a Full Stack Developer with extensive experience building web applications, SaaS platforms, eCommerce stores, business automation systems, APIs, and mobile applications for startups, agencies, and growing businesses. Over the years, I have worked with companies across multiple industries, helping them launch new products, improve existing platforms, automate workflows, integrate third-party services, and scale their digital presence. Whether you need a complete application built from scratch, additional functionality added to an existing platform, or a technical partner who can guide your project from concept to launch, I can help. I enjoy working on projects where technology solves real business problems. From custom dashboards and SaaS products to WordPress websites and Shopify stores, I bring both technical expertise and practical problem-solving to every project. What I Can Help You Build: Custom web applications designed for scalability, performance, and long-term growth. React.js / Next.js / Node.js / Express.js MongoDB / MySQL / PostgreSQL REST API Development Authentication Systems Admin Dashboards / Business Portals CRM / ERP Systems Custom Software Solutions I help founders and businesses build SaaS products from idea to production. Multi-tenant SaaS Platforms Subscription Systems Stripe Integrations User Management Systems Analytics Dashboards Workflow Automation Customer Portals Custom Business Logic MVP Development Modern businesses rely on software integrations, and I have extensive experience connecting systems together. Third Party API Integrations Custom API Development QuickBooks / Stripe / Payment Gateway Integrations CRM Integrations Webhook Development Data Synchronization Backend Services Cross-platform mobile applications that deliver a seamless user experience. React Native Flutter iOS Applications Android Applications Firebase Push Notifications API Integrations Business Apps Customer-Facing Apps AI-powered applications and automation that bring intelligence to your workflows. Custom AI Chatbots (OpenAI, Claude, Gemini) LLM Integration and Prompt Engineering AI Agent Development Workflow Automation with n8n, Make, or custom solutions Voice AI and Voice Assistant Integration AI-Powered Customer Support and Lead Qualification Document Processing and Summarization AI Content Generation and Categorization Smart Form Fill and Data Extraction Automated Email and Messaging Campaigns Powered by AI Why Clients Enjoy Working With Me: Clear and professional communication Reliable project delivery Strong attention to detail Ability to understand business requirements quickly Clean and maintainable code Problem-solving mindset Long-term partnership approach Fast response times Transparent development process Commitment to quality and performance I understand that hiring a developer is about more than technical skills. Clients want someone they can trust, someone who communicates clearly, takes ownership of the work, and consistently delivers results. That's exactly what I strive to provide on every project. Let's discuss your project and explore the best solution for your business. Keywords Full Stack Developer, Full Stack Development, MERN Stack Developer, MERN Developer, React Developer, React.js Developer, Next.js Developer, Node.js Developer, Express.js Developer, JavaScript Developer, TypeScript Developer, SaaS Developer, SaaS Development, Web Application Development, Custom Software Development, API Development, REST API Development, API Integration, QuickBooks Integration, Stripe Integration, Dashboard Development, CRM Development, ERP Development, Business Automation, Mobile App Developer, React Native Developer, Flutter Developer, Firebase Developer, MongoDB Developer, PostgreSQL Developer, MySQL Developer, Custom Web Applications, Startup Development, MVP Development, eCommerce Development, Full Stack Engineer, Software Engineer, Frontend Developer, Backend Developer, Website Development, Web Development, SaaS Applications, Custom Business Software, AI Chatbot Development, AI Agent Development, AI Automation, n8n Workflow Automation, OpenAI Integration, Claude API Integration, LLM Integration, Voice AI Integration, Conversational AI, Workflow Automation Developer, AI-Powered Automation, Intelligent Document Processing, Smart Data Extraction, AI Lead Qualification, Automated Workflows

  • Flutter
  • MERN Stack
  • React Native
  • Web Application
  • Mobile App
  • RESTful API
  • Node.js
  • AI Chatbot
  • Automation
  • Web Design
  • API Integration
  • Web Development
  • Next.js
  • Payment Gateway Integration
  • WordPress
  • Webflow
  • Shopify
  • Wix
  • Full-Stack Development
  • Ecommerce Website
Michael J.

West Bloomfield Township, Michigan

$100/hr
5.0
98 jobs

๐Ÿซก Extremely Reliable, Communicative and Fast ๐Ÿฅ‡ The Top 1% of Talent (Expert Vetted) ๐Ÿ’ฐ 60+ apps shipped, generating over 8 figures in revenue. โšก 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) ๐Ÿ› ๏ธ Specializing in Mobile App Development | Flutter, Swift, or React | iOS and Android ๐Ÿ‡บ๐Ÿ‡ธ Honored as a Top Mobile App Developer for hire in the United States from 2020-2025. ๐Ÿ† Award Winning Mobile App Developer: previous app featured on Apple's List of Best Language Learning Apps. ๐Ÿ“ฐ 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. โญ๏ธ 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: ๐Ÿ… Top 1% of Mobile Developers ๐Ÿ… Top 1% of iOS Developers ๐Ÿ… Top 5% of Firebase Developers ๐Ÿ… Top 5% of Swift Developers ๐ŸŽ“ 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. ๐ŸŒŸ 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. ๐Ÿ˜ 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. Letโ€™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,ย Mobile App Architecture,ย 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

  • Flutter
  • Smartphone
  • Dart
  • Mobile App Development
  • iOS Development
  • Swift
  • Android App Development
  • AI Mobile App Development
  • Full-Stack Development
  • AI Development
  • App Development
  • Mobile App Design
  • iOS
  • API Integration
  • Mobile App
  • Hybrid App Development
  • Android
  • Native App Development
  • Amazon Web Services
  • User Authentication
Karl S.

Townsend, Delaware

$50/hr
4.2
20 jobs

Top Rated Plus Full Stack Mobile App Developer | Top 3% UpWork Talent | Flutter | Kotlin | Swift | React, Node.js, AWS | Building Scalable Digital Experiences Iโ€™m a passionate and detail-oriented Full Stack Developer with over 10 years of experience crafting high-quality Web and Mobile applications for startups, enterprises, and agencies worldwide. I specialize in building end-to-end solutions using modern technologies and frameworks โ€” from beautiful, responsive UIs to robust, scalable backend systems. ๐Ÿ’ก Tech Stack Highlights: Frontend:Flutter (Dart), React-Native, Kotlin, Swift, React.js, Tailwind CSS, TypeScript Backend: Node.js (Next.js, NestJS), GraphQL, REST APIs Database:, MySQL, MSSQL, MongoDB, Firebase, Google Cloud DevOps/Cloud: Docker, GitHub Actions, AWS (EC2, S3, Lambda) Tools: Git, Jira, Notion, Postman, CI/CD, WebSockets, Stripe, OAuth2 What I Offer: Full-cycle Development from concept to Deployment Clean, maintainable, and scalable code Mobile-friendly, SEO-optimized, and fast-loading applications API integrations (Stripe, Twilio, Firebase, third-party REST/GraphQL) Agile collaboration with clear communication and on-time delivery Iโ€™ve completed a wide range of freelance projects: custom dashboards, SaaS platforms, eCommerce sites, API backends, mobile-first apps, and admin panels. Whether you're looking to launch an MVP, optimize an existing product, or scale your system, I bring technical expertise and business acumen. โœ… Why Clients Choose Me: Strong work ethic & attention to detail Fast learner and great problem solver Transparent and clear Communication Available for one-time projects or long-term collaboration Letโ€™s build something amazing together. Drop me a message โ€” Iโ€™d love to hear about your project!

  • Flutter
  • Dart
  • Mobile App Development
  • Kotlin
  • Swift
  • React Native
  • React
  • Node.js
  • Next.js
  • MongoDB
  • Google Cloud Platform
  • NestJS
  • Firebase Cloud Firestore
  • FlutterFlow
  • .NET Core
  • MySQL
  • API Development
  • Stripe API
  • In-App Purchases
  • In-App Subscription
Haris S.

Bloomingdale, Illinois

$70/hr
4.6
126 jobs

Iโ€™m a Top-Rated Senior Full Stack Developer with 13+ years of experience building scalable web and mobile applications for startups, agencies, and enterprise clients. I specialize in delivering high-performance, user-focused solutions across both front-end and back-end development, with a strong focus on clean architecture, scalability, and long-term maintainability. โœ… Top Rated Plus โ€“ Expert-Vetted Top 1%โ€จ โœ… 13+ Years of Professional Experienceโ€จ โœ… Full Stack Web & Mobile Application Developmentโ€จ โœ… Strong Experience with Startups, SaaS Platforms & Enterprise Solutions Technical Expertise: Mobile:โ€จFlutter, React Native, Swift, Java CMS & E-Commerce:โ€จWordPress, Shopify, WooCommerce, HubSpot, Drupal Frontend:โ€จReact, Angular, Vue.js, Next.js, HTML5, CSS3, Tailwind CSS, Bootstrap Backend:โ€จNode.js, Express.js, Django, Python, Laravel, .NET Databases:โ€จPostgreSQL, MySQL, MongoDB, Firebase DevOps & Cloud:โ€จGit, Docker, CI/CD, AWS, Azure, Nginx I have extensive experience leading projects from concept to deployment, building robust APIs, custom platforms, mobile applications, and scalable cloud-based systems while ensuring high code quality and seamless user experiences.

  • Flutter
  • Mobile App Development
  • Node.js
  • React
  • Shopify
  • JavaScript
  • PHP
  • WordPress
  • WooCommerce
  • iOS Development
  • React Native
  • Android App Development
  • Swift
  • Objective-C
  • Laravel
Herman K.

Wilmington, Delaware

$38/hr
5.0
60 jobs

Did you know that 68% of MVPs fail within months of launch? Budgets blow up. Deadlines slip. Most teams lose focus on what actually matters. Sound familiar? I'm Herman, CEO of Coding House Studio. As your future technical partner and a mobile app development team, we help advertising agencies and small to mid-size businesses launch MVPs the right way โ€” fast, focused, and without cutting corners. We build products ready to grow, centered on the features that matter most, and designed to get your idea in front of real users as quickly as possible. We reduce time to market by 40% compared to traditional alternatives by focusing strictly on high-impact MVP features. We've been doing this for over five years and we understand what our clients need, often before they say it. More than 20 projects delivered across North America. In Q1 of 2026, three of our clients went live on both the App Store and Google Play. We know what it takes to go from idea to launch as a mobile app developer โ€” and we help you get there without wasting time or money. Our mobile app developer team of 15 handles everything from rough notes to a polished, ready-to-launch product. Most projects ship in 4 to 12 weeks, with ongoing support if you need it. We use AI to build faster and smarter โ€” and help our clients integrate AI directly into their own apps. You get a clear path from idea to a working mobile app that launches, gets users, and scales. Instead of just development, you get a mobile app developer team focused on real outcomes for iOS and Android. If your mobile app developer process slows down or becomes too complex, you get structure and clarity. If you already have a mobile app, you get help with new features, API integration, and performance improvements. If you are starting from scratch, you get a clear path to MVP launch with an experienced mobile app developer by your side. Our clients rely on us for transparency. We help you figure out what your MVP needs right now โ€” and what can wait. If you're looking for a trusted mobile app developer partner to launch on time and on budget, we're here. ๐—ช๐—ต๐—ฎ๐˜ ๐˜†๐—ผ๐˜‚ ๐—ด๐—ฒ๐˜ - Mobile app developer for iOS development and Android app development using Flutter, React Native, Swift, Kotlin, and Java, with strong focus on mobile app design, performance, and smartphone optimization - A clear MVP development process with fast time to market and structured app development - A full product built with backend systems, API integration, and scalable architecture using Node.js, JavaScript, Python, Firebase, and Supabase - Web application, admin dashboard, and user dashboard to support your product, built with a web developer approach using React and modern frontend tools, wordpress - Continuous product growth through mobile app improvement, mobile app redesign, and mobile app bug fix cycles You get experience from 20+ launched products across healthcare, SaaS platform, marketplaces, EdTech, and consumer apps. The focus is always the same. Your product works for real users, not just in code. ๐—ช๐—ต๐—ฎ๐˜ ๐—บ๐—ฎ๐—ธ๐—ฒ๐˜€ ๐˜๐—ต๐—ฒ ๐—ฑ๐—ถ๐—ณ๐—ณ๐—ฒ๐—ฟ๐—ฒ๐—ป๐—ฐ๐—ฒ You get a product that performs after launch, not just something that was built. No unnecessary complexity and no overengineering. You get AI integration, payment integration, subscription system, and real-time communication only where it actually improves your product. ๐—ฅ๐—ฒ๐˜€๐˜‚๐—น๐˜๐˜€ ๐˜†๐—ผ๐˜‚ ๐—ฐ๐—ฎ๐—ป ๐—ฒ๐˜…๐—ฝ๐—ฒ๐—ฐ๐˜ - 20+ mobile app developer projects launched across iOS and Android - Products with active users, subscription system, and real business logic built through mobile app developer - Scalable systems with API integration, admin dashboard, and user dashboard built from the start If you are looking for a mobile app developer who can take your idea to launch or move your product forward, send a message. You will get a clear breakdown of your idea and a step-by-step plan to launch your app faster. ๐˜๐˜ฆ๐˜ณ๐˜ฎ๐˜ข๐˜ฏ ๐˜’๐˜ณ๐˜ข๐˜ท๐˜ค๐˜ฉ๐˜ฆ๐˜ฏ๐˜ฌ๐˜ฐ ๐˜Š๐˜ฐ๐˜ฅ๐˜ช๐˜ฏ๐˜จ๐˜๐˜ฐ๐˜ถ๐˜ด๐˜ฆ๐˜š๐˜ต๐˜ถ๐˜ฅ๐˜ช๐˜ฐ ๐— ๐—ฒ๐˜€๐˜€๐—ฎ๐—ด๐—ฒ ๐—บ๐—ฒ ๐—ฎ๐—ป๐—ฑ ๐—น๐—ฒ๐˜โ€™๐˜€ ๐˜๐—ฎ๐—ธ๐—ฒ ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ฎ๐—ฝ๐—ฝ ๐—ถ๐—ฑ๐—ฒ๐—ฎ ๐—ณ๐—ฟ๐—ผ๐—บ ๐—ฐ๐—ผ๐—ป๐—ฐ๐—ฒ๐—ฝ๐˜ ๐˜๐—ผ ๐—น๐—ฎ๐˜‚๐—ป๐—ฐ๐—ต.

  • Flutter
  • Smartphone
  • Mobile App Development
  • Android
  • iOS Development
  • Android App Development
  • React Native
  • Kotlin
  • Swift
  • Mobile App
  • JavaScript
  • Hybrid App Development
  • Mobile App Design
  • App Development
  • API Integration
  • Node.js
  • User Profile Creation
  • Native App Development
  • PHP
  • Mobile App Development Consultation
Mo A.

Katy, Texas

$45/hr
5.0
4 jobs

๐‘ณ๐’๐’๐’Œ๐’Š๐’๐’ˆ ๐’‡๐’๐’“ ๐’‚ ๐‘ฏ๐’š๐’ƒ๐’“๐’Š๐’… ๐‘ด๐’๐’ƒ๐’Š๐’๐’† ๐‘จ๐’‘๐’‘ ๐‘ซ๐’†๐’—๐’†๐’๐’๐’‘๐’†๐’“ ๐’˜๐’‰๐’ ๐’„๐’‚๐’ ๐’ƒ๐’–๐’Š๐’๐’… ๐’‡๐’‚๐’”๐’•, ๐’”๐’„๐’‚๐’๐’‚๐’ƒ๐’๐’†, ๐’‚๐’๐’… ๐’‰๐’Š๐’ˆ๐’‰-๐’’๐’–๐’‚๐’๐’Š๐’•๐’š ๐‘ญ๐’๐’–๐’•๐’•๐’†๐’“ ๐’‚๐’๐’… ๐‘น๐’†๐’‚๐’„๐’• ๐‘ต๐’‚๐’•๐’Š๐’—๐’† ๐’‚๐’‘๐’‘๐’๐’Š๐’„๐’‚๐’•๐’Š๐’๐’๐’” ๐’‡๐’๐’“ ๐’ƒ๐’๐’•๐’‰ ๐’Š๐‘ถ๐‘บ ๐’‚๐’๐’… ๐‘จ๐’๐’…๐’“๐’๐’Š๐’…? ๐•๐• ๐•ฆ'๐•ฃ๐•– ๐•š๐•Ÿ ๐•ฅ๐•™๐•– ๐•ฃ๐•š๐•˜๐•™๐•ฅ ๐•ก๐•๐•’๐•”๐•–โญ I help startups, SaaS companies, and growing businesses turn ideas into modern hybrid mobile apps that are fast, reliable, and ready to scale. Whether you're building a new MVP, improving an existing mobile app, or launching a production-ready product, I provide complete Hybrid App Development services from planning to deployment. As a Hybrid Mobile App Developer, I specialize in Flutter Development and React Native Development, building cross-platform mobile applications with a single codebase while maintaining native performance and a polished user experience. Every application is developed with clean architecture, responsive UI, optimized performance, and scalability in mind. Beyond mobile development, I also build secure backend systems, integrate third-party APIs, connect cloud services, and implement AI-powered features. This allows you to work with one developer for your complete mobile application instead of coordinating multiple freelancers. Whether your project requires Firebase, Supabase, REST APIs, authentication, push notifications, real-time data, payment gateways, or AI integrations, I deliver solutions that are maintainable, secure, and built for long-term growth. Services I Offer โœ” Hybrid App Development โœ” Flutter App Development โœ” React Native App Development โœ” Cross-Platform Mobile App Development โœ” Android App Development โœ” iOS App Development โœ” MVP Development for Startups โœ” Figma to Flutter & React Native โœ” UI Implementation & Responsive Design โœ” REST API Integration โœ” Firebase & Supabase Development โœ” Node.js Backend Development โœ” Authentication & User Management โœ” Push Notifications & Real-Time Features โœ” Payment Gateway Integration โœ” AI ChatGPT & OpenAI Integration โœ” AI Chatbots & AI Features โœ” App Store & Google Play Store Deployment โœ” Bug Fixing & Mobile App Maintenance โœ” Performance Optimization & Code Refactoring โœ” Clean Architecture, Riverpod, Bloc & GetX State Management Why Clients Work With Me โ€ข Hybrid Mobile App Development specialist โ€ข Flutter & React Native expertise โ€ข Full Stack Mobile App Development โ€ข End-to-end development from idea to launch โ€ข Clean, scalable, and maintainable code โ€ข Strong communication and reliable delivery โ€ข Business-focused solutions, not just code โ€ข Long-term support and continuous improvements If you're looking for a Flutter Developer, React Native Developer, or Hybrid Mobile App Developer who understands both mobile apps and backend development, let's build an application that delivers an excellent user experience and supports your business as it growsโœ…

  • Flutter
  • Smartphone
  • Mobile App Development
  • Android App Development
  • iOS Development
  • Chat & Messaging Software
  • User Authentication
  • Hybrid App Development
  • Native App
  • React Native
  • API
  • API Integration
  • Android
  • In-App Purchases
  • Mobile App Design
  • AI Chatbot
  • Android SDK
  • Mobile UI Design
  • Bug Fix
  • User Profile Creation

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