Hire the Best Koa Developers

As a Top Rated Senior Developer with over a decade of experience, I don't just write code — I engineer scalable, high-performance solutions. I have logged over 2,000+ hours on Upwork with a proven track record of delivering end-to-end web and mobile applications for global clients. My expertise bridges the gap between complex backend logic and intuitive frontend design. Whether you need a cross-platform mobile app, a robust SaaS platform, or legacy system modernization, I bring the technical depth to deliver on time and within budget. Core Technical Stack: - Frontend: ReactJS, NextJS, VueJS, Tailwind CSS, Material Design. - Backend: Node.js (NestJS), PHP (Laravel, Symfony, Zend), RESTful APIs, GraphQL. - Mobile: Flutter, React Native (iOS & Android). - DevOps & Cloud: AWS (EC2, S3, LB), Google Cloud, Firebase, Linux Administration, CI/CD pipelines. E-Commerce: Magento, WooCommerce, Shopify, Custom Plugin Development. Why Clients Choose Me: Reliability: I have maintained a "Top Rated" status by consistently meeting deadlines and milestones. Communication: Fluent in English with the ability to translate complex technical concepts for stakeholders. Full Cycle Ownership: From reading wireframes to deployment and maintenance. Flexibility: Experienced in remote setups (SSH, VPN) and ready to integrate into existing teams or lead new projects. I am looking for partners who value quality engineering. Let’s discuss how I can bring value to your next project.

I build and ship complete Apple-platform products — alone, end to end. 8 apps live on the App Store right now (search "SwiftQuantum" or "Q-Bridge") — and 8 companion web apps you can open this second at ide.swiftquantum.tech or edu.swiftquantum.tech. Each product ships with its own FastAPI backend, Next.js web app, Stripe billing, and 7-language localization. You can verify every claim before you message me. WHAT I DELIVER • iOS/macOS apps in SwiftUI (Swift 6 strict concurrency), from architecture to App Store approval • StoreKit 2 subscriptions, in-app purchase flows, and App Review survival (I've passed review 8× including Catalyst, watchOS, and CarPlay targets) • On-device AI with Apple Foundation Models, Metal compute shaders, and Accelerate • FastAPI backends and Next.js 16 / React 19 frontends that talk to those apps — one codebase philosophy, ~1,200 API routes in production • iOS→Web ports with true feature parity (my largest port: 119/119 native views recreated on the web), plus heavy in-browser compute: a WebAssembly statevector engine and a 127-qubit stabilizer simulator running in Web Workers, Monaco editor integration • Stripe subscriptions live across 8 products simultaneously • AWS on ECS Fargate: I consolidated 18 load balancers into 1 and cut my own infra cost by more than half, so I'm comfortable auditing yours WHY THE UNUSUAL BACKGROUND HELPS YOU My products are quantum-computing tools — a 127-qubit circuit IDE, a post-quantum-cryptography scanner (NIST FIPS 203), a physics education platform with 46 levels. Building simulators and PQC pipelines solo means your CRUD app, dashboard, or subscription flow is well within range — and it will be built with the same rigor. Before this: patent holder (AI systems), Excellence Award at the 2024 Korea Open Data Forum, 1st place in a national startup competition, and former CTO of products serving 10,000+ daily users. IEEE member, presenting at IEEE Quantum Week 2026 in Toronto. HOW I WORK Honest scoping (I'll tell you if something is a bad idea), daily written updates, and no fabricated demos — everything I show you runs. My own apps ship with built-in filters that block exaggerated claims, including mine; I bring that standard to client work. Seoul timezone (UTC+9): I work while your team sleeps, and you wake up to progress. Send me your spec or even a rough idea — I'll reply with a concrete plan, a realistic timeline, and what I'd cut to ship faster.

Senior Node.js, React & React Native developer with 5+ years of experience building scalable APIs, web/mobile apps, and real-time systems. Strong background in authentication, payments, Firebase, AWS, and AI integrations for SaaS platforms. Backend-focused engineer with solid frontend expertise—React.js for SPAs and React Native for cross-platform mobile applications—delivering clean, maintainable, and production-ready code. Tech stack highlights: - Node.js (MEAN & MERN stacks) - React.js & React Native - GraphQL & RESTful APIs - MongoDB, MySQL, PostgreSQL - TypeORM, Sequelize, Prisma,... - AWS services I’d be excited to apply my skills to your project and deliver meaningful value to your team.

Are you finding Frontend Developer to convert your design to Website UI or a Backend Developer who is able to build website from your requirements and as well as implementing various functionality as you requested, finish your requirements in a short time, write highly optimized and reusable code? You have come to the right place. My core technologies are Java Spring Boot and ReactJS. I may not be one of the best developers in my field, but I will be the only person who is willing to do this for you: ◾Willing to spend more time researching about your requirements to create the best product. ◾Take communication as priority to have the best understanding about your requirements. If anything is unclear, I will try to ask to avoid misunderstandings between us. ◾Always passionate with the job, always spending extra time to finish the task is also one of my hobbies (Since you are happy with my products, I will be happy too) ◾Always trying to optimize as well as write reusable code to make the website as quality as possible (Of course with my skill I cannot make it smooth like the top programmers, but I will try my best) ◾Familiar with lots of library and extensions to make the website look more attract. (By using animations) ◾Carefully responsive on many screen sizes and devices to help you reach with more customers. Also, I'm using SSR so the SEO of the website will be enhanced. Unlike other developers who prioritize speed and monetary gain, I approach my work with genuine passion and commitment, striving to deliver the best possible product for you. My focus is not just on finishing quickly, but on pouring my heart into the development process to ensure exceptional results that meet your unique needs. I have obtained an IELTS score of 6.5, which reflects my abilities in reading, writing, speaking, and listening in English. I am confident in my skills across all these areas. Through the period at my previous company, I successfully contributed to generating $100000 in revenue from client projects originating from Europe, Taiwan, Australia, and Vietnam. If given the opportunity to work with you, I envision a bright and promising future ahead. Together, we can achieve remarkable results and create a successful partnership. By leveraging my skills, experience, and dedication, I am confident in our ability to not only meet but exceed your expectations. I look forward to collaborating with you to accomplish outstanding outcomes and unlock new opportunities for mutual growth and prosperity. Please contact me if you find interesting about my services.

Are you looking for a reliable professional to build, fix, upgrade, migrate, or maintain your Joomla website? You’ve come to the right place! With over 900 completed projects, 800+ satisfied clients, 2,700+ hours worked, and a 100% job success rate, I bring a proven track record of excellence and reliability. For the past 14 years, I have honed my skills and gained significant expertise in the following areas: 1. Joomla Upgrades • Seamlessly upgrade any Joomla website—from version 1.0 to the latest Joomla 5 or 6. • Rebuild templates to ensure mobile responsiveness and modern standards. 2. Custom Joomla Website Development • Build professional Joomla websites from scratch tailored to your unique needs. 3. Hacked Website Restoration • Clean up and fully restore compromised Joomla websites to ensure security and functionality. 4. Template Development & Modification • Design and modify Joomla templates to align with your vision and brand. 5. Responsive Web Design • Make your Joomla website mobile-friendly and visually appealing across all devices. 6. Website Security • Implement robust measures to secure your Joomla website from potential threats. 7. Speed Optimization • Optimize your website for faster loading times and improved performance. 8. Ongoing Maintenance • Provide reliable maintenance services to keep your Joomla website running smoothly. Your project deserves a professional with hands-on experience, attention to detail, and a commitment to delivering results. Let’s work together to bring your vision to life or ensure your Joomla website operates at its best. ***************************** What Clients are saying. ***************************** "Kunule is awesome! Completed the job ahead of deadline and also went above and beyond the job requirements. Our job request was an upgrade to an existing website. Kunule not only upgraded the template but also created an entirely new website with a new modern take and increased functionality over the old template. Of course we liked his new version better than the old one." "I would rate him 20 stars and will recommend him to anyone needing Joomla work!" "Very satisfied with the quality of the work. He went above and beyond, offering enhancements I hadn't even asked for at no extra cost" "Great work - really thinks about the problem and comes up with solutions proactively...that's a rare thing." "Writing anything less than "this was a great gig done very professionally" would be a serious understatement.” "Absolutely excellent in all areas. I could work with this guy all day long - courteous, professional, fast and cost agreeable."

★ Wordpress Developer ★ Hi, I'm a WordPress Developer. 10+ Yrs of XP in 1500+ of Figma, PSD, XD, Ai to HTML/WordPress Conversion with High-quality Code, Pixel-perfection, Fully Responsive, Major Browsers Compatibility (Chrome, Firefox, IE9+, Safari, Opera), On-Page SEO optimized Markup,... My main skills: WordPress Theme, Web Development, WordPress Migration , Figma to Custom theme, ACF, Divi, Elementor, Gutenberg Editor, WooCommerce, WPML, Gravity Forms, Figma to HTML, Figma to Mailchimp, Email Template, ... I also good with Mobile Apps, React, Angular, Vue.js, Shopify, Webflow, WIX,... and other CMS Why Choose Me? ---------I AM TOP RATED PLUS ---------------- ***** All History Job With 5 Star Reviews ***** "Very efficient and carried out the job as described.", "Great work and communication.", ... ✓ I'm a Full-Time Freelancer (Dedicated 9 Hours/day Work Guaranteed) ✓ 8+ Years working experience (Front-end Web Development) ✓ Extremely Fast (Quick Turnaround always) ✓ Great Communication (Throughout the Project and even after the work delivery) ✓ Reliable, Dedicated, Passionate & Detailed Oriented Web developer. ✓ ... Sound's Good? Let's discuss your project and work together! or if you have any questions? Please Contact me. - Best Regards! Hung Le