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𝐀𝐥𝐥 𝟓-𝐒𝐭𝐚𝐫 𝐑𝐞𝐯𝐢𝐞𝐰𝐬.🌟 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 🌟 • 𝐓𝐨𝐩 𝟏𝟎% 𝐨𝐟 𝐔𝐩𝐰𝐨𝐫𝐤 𝐅𝐫𝐞𝐞𝐥𝐚𝐧𝐜𝐞𝐫𝐬 🥇 A Senior Fullstack & Mobile Developer with over 12 years of experience delivering high-quality software solutions for web and mobile applications. I have successfully built and launched 30+ mobile apps, many of which are live in the App Store and Google Play. I do not just write code — I help clients move their product from idea, MVP, or existing web app to a real mobile app that can be tested, submitted, and launched. I help founders, startups, and businesses build, fix, and launch production-ready mobile apps for the App Store and Google Play. With 12+ years of software development experience and 30+ launched mobile apps, I specialize in iOS, Android, cross-platform mobile development, backend integration, in-app purchases, authentication, AI-powered features, and app store release support. My strongest areas include: ✅ iOS development with Swift, SwiftUI, UIKit, and Objective-C ✅ Android and cross-platform apps with Flutter, React Native, Expo, and Capacitor ✅ App Store and Google Play submission, TestFlight, internal testing, closed testing, and review issue fixes ✅ In-App Purchases, subscriptions, RevenueCat, Superwall, Stripe, and payment flows ✅ Supabase, Firebase, Firestore, PostgreSQL, MySQL, MongoDB, and backend integrations ✅ Apple Sign-In, Google Sign-In, Firebase Auth, Supabase Auth, and social login flows ✅ AI app development using OpenAI API, Claude, DeepSeek, and other AI integrations ✅ Push notifications, APNS, FCM, maps, background location, Bluetooth, and real-time features ✅ Existing app maintenance, performance improvement, bug fixing, and production issue resolution I can help you with: - Turning web apps, Lovable, Bolt, Replit, FlutterFlow, Base44, or existing MVPs into iOS and Android apps - Building complete iOS and Android apps from scratch based on designs created in Figma, Adobe XD, or Sketch - Turning UI/UX designs into pixel-perfect, responsive mobile applications - Developing complete backend systems, databases, APIs, authentication, and admin dashboards - Handling the complete development lifecycle—from UI implementation and backend development to testing and App Store/Google Play release - Preparing iOS and Android builds for TestFlight and Google Play testing - Fixing App Store and Google Play rejection issues - Setting up subscriptions, paywalls, free trials, and restore-purchase flows - Integrating Supabase, Firebase, RevenueCat, Stripe, OpenAI, and other third-party services - Building AI-powered mobile features such as chat, analysis, content generation, voice interaction, and automation - Improving existing apps, fixing production issues, and preparing them for release Tech stacks I work with: Mobile: Swift, SwiftUI, UIKit, Objective-C, Flutter, Dart, React Native, Expo, Capacitor, Android Backend: Java, Spring Boot, Go, Gin, Python, REST APIs, WebSocket, microservices Database & Cloud: Supabase, Firebase, Firestore, PostgreSQL, MySQL, MongoDB, SQLite, Redis, Google Cloud, AWS Payments & Subscriptions: RevenueCat, Superwall, Stripe, Apple IAP, Google Play Billing AI & Automation: OpenAI API, Claude, DeepSeek, AI-assisted app features, AI workflow integration I focus on clean implementation, reliable communication, and practical solutions that help your product move forward. Whether you need to launch a new app, fix an existing one, add subscriptions, solve login issues, or pass app review, I can help you get it done properly. If you need a developer who understands both mobile development and the full release process, I’d be happy to help.

Hi, I am a Full-Time and Full-Stack software developer. I have 10+ years experiences in Python, Automation, Robots, Web Development, Web Scraping, Web Crawler, Data Analysis, Data Scraping, Data Mining, Data Extraction, and so on. I have developed many websites in Python, Django, React, TypeScript/JavaScript, Django REST framework, and I am familiar with the technologies of web development, e.g. HTML/CSS/JavaScript, Tailwind CSS, etc. I have completed the robots of or scraping data from Twitter, Instagram, Telegram, Amazon, Ebay, JD, Taobao, Tmall, etc. in the form of APP or Website. I can solve the problems of anti-spider(e.g. CAPTCHAs). My Major Services: ✔ Full-Time freelancer focusing on your projects ✔ Work on the projects I can deliver 100% ✔ Excellent quality of work ✔ Responsibility for all projects ✔ Reliability ✔ Short response time ✔ Make helpful suggestions to add more value to your projects ✔ Work in a way that is more beneficial to you to reduce costs and increase results ✔ Try to make all projects and relationships successful, valuable, and creative My Major Skills: ☆ Python ☆ Django ☆ Django REST API ☆ JavaScript/TypeScript ☆ React, Next.js, React router ☆ HTML, CSS, Tailwind CSS, jQuery, Bootstrap ☆ Selenium ☆ Appium ☆ Linux ☆ Scrapy ☆ Requests ☆ pandas ☆ lxml ☆ openpyxl(Excel) ☆ BeautifulSoup4 ☆ Shell, Bash ☆ Docker, AWS, Digital Ocean, Could Platform, CI/CD ☆ Java ☆ Database (PostgreSQL, Mysql, SQLite, Oracle) ☆ Software Testing ☆ Automation Testing (Robot Framework, Selenium, JMeter, etc.) ☆ Ruby ☆ etc. Please feel free to contact me if you have any questions. I am glad to hear from you and help you!

**TOP RATED PLUS** TOP 3% Of Upwork Freelancers By QUALITY Bottom 50% by PRICE. Experienced professional in offshore development with over 18 years working with a US company, 20+ years exp in IT industry. Areas of expertise: web development, application development, native mobile app development. NDA can be signed upon client request. With experience in the education, banking, non-profit, medical and business world on-and-off upwork, we offer our clients efficient and accurate output of the highest standard, saving them time and money, delivering the desired results, and often surpassing their expectations. =====BELOW ARE SOME KEYWORDS FOR YOU TO FIND ME HERE===== Professional Skills - Languages: PHP, SQL, BASH, HTML5, JavaScript, XHTML, CSS, XML, JSON, VUE - OS: Linux (CentOS/Ubuntu), OSX, Windows series; - Administration: Apache, UNIX Shells/Scripting; - Database: MySQL, MongoDB; - Technologies: MVC, jQuery, Bootstrap/Foundation, CodeIgniter / Yii /Laravel Framework, SVN/Git, Smarty, PEAR; - IDE: PHPStorm, NetBeans, Zend Studio; - 3rd part API: Facebook, AWS, Google Maps, Flickr, Payflow and Twitter, Youtube/Vimeo, Google Doc, Mailgun, Mailchimp, AliPay, WeChat, etc - 2nd developing: Joomla!, WordPress, Durpal, SugarCRM, ZenCart, VanillaForum, OpenCart, osC; - PCI Complaince, ADA Complaince, Section 508 - Knows Basic HIPPA laws for website and web application level. Willing to use scanners to help application to pass HIPPA complaince. - Wechat Mini Programm. WeChat Work. WeCom, WeChat Official Account Programing/Customizations. weixin Summary/Highlights: - Good at PHP programming, 10 years of PHP programming experience, and 7 years of web front-end programming experience. - Agile web development experience, TDD; - CSS pixel-level layout consistency with browser, version and platform independence, can solved cross browser/platform and device compatibility issues. - Good at responsive layout; - Smoothly use MVC framework for PHP developing, good at CodeIgniter/Laravel/Yii/Kohana framework; - Have strong knowledge of AWS (EC2, S3, SNS, etc.) APIs and have implement experience; - Design and implement of the Web Crawler(based on CURL lib), tens of millions of data crawl experiences; - Code optimization for SEF/SEO; - Solve XSS/CSRF issues experience; - Deploy and maintains production server (LAMP and Control Panel) experience; - Code optimization for load speed and render speed; - Offsite Backup/Recovery system experience; - Experience working with CI/CD tools like Jenkins. - Fluent English and Chinese/Mandarin.

An experienced full-stack developer and RPA engineer, specializing in creating robust, scalable systems and automating processes to enhance efficiency. With extensive expertise in Python, I’m skilled in libraries and frameworks such as FastAPI, Scrapy, Vue.js, Playwright, and SQLAlchemy. I also have a strong background in reverse engineering, webpack, and JS manipulation, allowing me to tackle complex problems and develop efficient, tailored solutions. Key Skills & Areas of Expertise: Full-stack Development: Designing and developing dynamic, user-friendly websites and applications using modern technologies. Automation & RPA: Building automated systems to replace repetitive tasks and optimize workflows, utilizing Python, RPA frameworks, and Playwright. Reverse Engineering: Expertise in analyzing and understanding systems or software to extract data, optimize performance, or customize functionality. Data Science & Analysis: Handling data extraction, cleaning, and visualization with libraries like Pandas, SQLAlchemy, and others. API Development: Creating efficient, high-performance APIs with FastAPI, managing asynchronous requests, and integrating with databases. Thriving in high-pressure environments, I focus on solving intricate technical challenges and delivering high-quality results. Whether it's building sophisticated web apps, automating business processes, or reverse-engineering systems, I am committed to delivering impactful solutions. Let’s collaborate and bring your ideas to life.

Thank you for visiting my profile, you can call me Gary. I am a seasoned 2D game developer and have been developing games as an indie game developer for over 10 years. I am currently working on a 2D RPG game called "Monster Dungeon," which you can see in the Portfolio below. ⭐ I can develop various types of 2D games for you using various game engines: Unity3d, GameMaker, Godot, Cocos2d, and more. ⭐ In addition to developing the game you want, I will also use my experience to provide you with high-quality suggestions, including game design and art aspects, to improve the overall quality of your game as much as possible and make it stand out among the many games out there! ⭐ In addition to game development, I also have 8+ years of C++/C# development experience, including front-end and back-end development experience. This allows me to write high-quality code for you. Moreover, I have extensive experience in game performance optimization, which is very useful for mobile game development. Let's have a chat today and start working on your awesome project immediately!

Python * scrapy * selenium * requests * xpath * regular expression * json * mysql, pymysql, sqlalchemy * mssql, mymssql * other skills like - mutli-threads - proxies usage Automation: * excel automation * pdf extraction * web automation Unit test