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Experienced React Native & NestJS Software Engineer | Building Scalable Mobile & Web Applications As a skilled Software Engineer, I specialize in creating cross-platform mobile apps, complex UI/UX designs, and responsive single-page web applications using React Native, ReactJS, and modern frameworks. My deep expertise ensures the delivery of high-quality, scalable, and performance-driven solutions tailored to your needs. What I Bring to the Table: Mobile App Development: Expertise in building cross-platform apps with React Native, from scratch to deployment on Google Play and the App Store. Web Development: Proficiency in ReactJS, crafting dynamic, single-page applications with a focus on seamless user experience. Back-End Expertise: Advanced skills in NestJS and Node.js, enabling me to develop powerful APIs and microservices that support scalable, high-performance systems. Cloud Deployment: Hands-on experience with AWS to deploy and scale applications, ensuring a secure and reliable infrastructure. How I Can Help You: Build applications from scratch. Maintain and optimize production-ready projects. Conduct code reviews and fix bugs. Develop new features and enhance existing functionality. Optimize performance and implement best practices for scalability. Tech Stack Expertise: Mobile & Front-End: React Native, React.js, Context API, Redux, Material UI, Expo, JavaScript, TypeScript, HTML5, SCSS. Back-End: NestJS, Node.js, Dotnet Core, REST APIs, PostgreSQL, Firebase. Tools & Workflow: GitHub, GitLab, BitBucket, Agile, Kanban, Trello, Jira. Cloud & Deployment: AWS, Firebase Hosting. Why Choose Me? Whether you’re looking to build an app from the ground up or refine your existing project, I am committed to delivering scalable, user-centric solutions that drive success. I thrive on collaboration and am always open to discussing ideas to ensure your project exceeds expectations. Let’s Connect: Have a project in mind? Need a React Native or NestJS expert? I’m here to help. Message me to discuss your project today!

Hi there! I'm Md Robi Ullah, a TOP RATED PLUS developer on Upwork with a 100% job success rate. With over 5 years of professional experience in software development, I specialize in React Native mobile application development. I completed my BSc in 2019 and have since honed my skills to deliver top-notch solutions for my clients. Key Skills and Expertise: • React Native Projects: Successfully developed 12 React Native mobile applications, with 10 live on both Android and iOS stores. • Firebase Proficiency: Experienced in various Firebase services including Authentication, Push Notifications, Messaging, Storage, Database, and Functions. • Real-time Applications: Expertise in building real-time chatting applications and real-time location tracking using Firebase Real-time Database. • Mobile Location Tracking: Proficient in Google Maps APIs and mobile location tracking. • Monetization and In-App Purchases: Skilled in implementing Google Admob for monetization and In-App Purchases. • UI/UX Excellence: Capable of delivering pixel-perfect UI and animations. • API Integration: Strong knowledge of integrating APIs efficiently and effectively. • State Management: In-depth understanding of state management using Redux. • JavaScript Mastery: Advanced knowledge of JavaScript (ES6+) and asynchronous code execution. • Debugging: Extensive experience in debugging and troubleshooting. • Native Module Integration: Able to modify and fix packages on the native side when necessary. • Responsive Communication: Known for immediate and effective communication with clients. I am confident in my ability to meet and exceed your expectations using my extensive freelancing and professional experience. I am available for interviews or skill assessments at your convenience.

👋 Hello there! 😄 I'm a full-stack developer with a passion for creating seamless and stunning mobile and web applications. When it comes to mobile development, I'm proficient in the following technologies: 📱 React Native 🚀 Expo 📱🔬 Android Studio In addition, I'm also experienced in working with the following third-party libraries, enabling me to add functionality and features that take your applications to the next level: 🌐 Firebase 📦 AWS S3 ☁️ AWS Cloud 🔑 Auth0 💬 Twilio 📆 Google Calendar API 🗺️ Google Maps API 🗺️ Mapbox ☁️ Microsoft Azure Blob Storage 🚀 Microsoft Azure Functions 🔐 Microsoft Azure Authentication Service With my skills in the following front-end technologies, I can bring your ideas to life with beautiful, intuitive interfaces that your users will love: 💻 JavaScript ⚛️ React 🔜 Next.js 🎨 Gatsby 🎨🚀 Tailwind CSS When it comes to back-end development, I'm well-versed in the following technologies, ensuring that your application is just as robust and secure as it is visually stunning: 💻🔙 Node.js 💻🔙NestJs ☕ Java Spring Boot 🐍 Django 🎁 CodeIgniter And when it comes to databases, I have experience working with the following technologies: 🗄️ MySQL 🗄️ PostgreSQL 🗄️ MongoDB I pride myself on delivering high-quality work that exceeds my clients' expectations. Whether you need help building a new mobile or web application from scratch or making updates to an existing one, I'm here to help. So, what are you waiting for? Let's work together to build something amazing! 😊

Hi, I'm Enrico. I build production-grade workflow automations, serverless API integrations, and resilient data pipelines. I specialize in helping digital businesses automate manual processes, synchronize data across platforms, and reliably extract business intelligence without the overhead of heavy enterprise software. --- 💼 ENTERPRISE-GRADE CREDIBILITY I write secure, maintainable code engineered to commercial standards: - Open-Source Enterprise Contributor: I have successfully contributed to Expensify's official commercial application (React Native & TypeScript), collaborating inside massive codebases alongside elite developers. - Core Integration Specialist: I build zero-maintenance B2B middlewares. My open-source application, StockSync Lite, synchronizes inventory levels between Shopify and eBay in real-time utilizing serverless architectures to keep infrastructure costs at exactly $0.00/month. --- ☁️ PROVEN CLOUD DATA SOLUTIONS I develop scalable, containerized data extraction tools (Actors) published on the global Apify ecosystem. My production-ready APIs process millions of requests across highly profitable domains: - Lead Generation & HR Tech: BuiltIn Tech-Stack Enricher, extracting company tech stacks and hiring intent. - Sports & Predictive Analytics: Flashscore Elite Statistics, providing deep match metrics and xG (Expected Goals) for data-driven analysis. - E-Commerce & Real Estate: Subito.it Universal Scraper, a real-time extraction pipeline for classified listings. --- 🛠️ MY TECHNICAL STRATEGY 1. API-First Integration: I prioritize clean, documented integrations using REST/GraphQL APIs and deep traffic analysis. This results in automations that are exceptionally fast and consume minimal bandwidth. 2. Advanced Data Extraction: When APIs are unavailable, I design robust, custom extraction pipelines (Playwright, Python) to gather essential business data reliably, handling complex logic and proxies under the hood. 3. Serverless & Cost-Effective Architecture: I build solutions optimized for ROI. By leveraging serverless Node.js functions (Vercel/Netlify), I save my clients hundreds of dollars in database maintenance and hosting fees. --- 🔧 TECH STACK & TOOLBOX - Languages: Python, TypeScript, JavaScript, SQL, HTML/CSS - Frameworks & Libs: React, React Native, Node.js (Serverless) - Data & Automation: Apify SDK, Playwright, BeautifulSoup, Data Pipelines (ETL) - APIs & Ecosystems: Shopify Admin API, eBay APIs, Webhooks, REST/GraphQL If you are looking for a developer who prioritizes system stability, security, and robust error handling (like exponential backoff and atomic retries), let's talk. Click "Invite to Job" to discuss your integration or automation bottleneck.