𝐀𝐈 & 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 with 10+ years of experience building SaaS platforms, AI powered applications, and web systems using React.js, Next.js, Node.js and modern cloud infrastructure. I’ve worked on production systems handling real users, performance optimization, AI integrations and complex frontend/backend architecture. I help startups and businesses build SaaS platforms, internal tools and automation systems that streamline operations, reduce manual work, and support long term growth. As a Full Stack Developer, I help startups and businesses build web applications using Next.js, React, Supabase, Node.js, PostgreSQL, AI integrations, and modern full stack architectures. I build platforms including: • Internal business systems • Dashboards & admin portals • SaaS applications • Workflow automation platforms • Client portals • Marketplace platforms • Multi-role web applications • Analytics & reporting systems • AI-powered applications • Custom operational software As a Full Stack Developer, I handle projects from frontend development and backend architecture to database design, API integrations, authentication systems, deployment and scaling. I work as a Full Stack Developer across both frontend and backend development, building applications designed for real world business operations and production environments. My stack as a Full Stack Developer includes: • Next.js • React • Node.js • TypeScript • Supabase • PostgreSQL • OpenAI APIs • Stripe • n8n • Vercel I’ve worked as a Full Stack Developer on platforms across multiple industries including analytics, operations, education, marketplaces, automation, AI systems and internal business management tools. Clients usually hire me as a Full Stack Developer when they need: • A Full Stack Developer who can build complete platforms • A web application built properly from the beginning • A modern dashboard or internal business system • A Full Stack Developer who understands workflows, operations, and business logic • A system that replaces spreadsheets and manual processes • A clean and scalable architecture ready for production As a Full Stack Developer, I focus on: • scalable architecture • clean UI/UX • fast execution • strong communication • production-ready systems My expertise as a Full Stack Developer includes: • SaaS platforms • Internal tools • Business platforms • Dashboard systems • Workflow automation • AI-powered web applications • Client portals • API integrations • Multi-role applications • Custom business software If you’re looking for a Full Stack Developer to build a SaaS platform, internal tool, dashboard, or custom web application, feel free to message me. Full Stack Developer | Full-stack developer | Full stack | Developer | Web developer | web applications | MVP Developer | SaaS Developer | Full Developer | Full-stack-developer | Supabase | Nextjs | Node js | Resend | Tailwind CSS | AI integrations

A Backend/Frontend Developer with 9+ years of experience in related fields, I specialize in front-end development, User Interface development & optimization. Full-commitment to work & respecting Deadlines is my motto. I enjoy working with small businesses and individual decision makers to provide architectural and custom business solutions that help my clients grow their business, and increase their profitability. My skill sets include: ★ Javascript, jQuery, AJAX ★ Wordpress ★ Shopify ★ Codeigniter ★ Magento ★ MVC Frameworks ★ Opencart ★ MySQL,MS-SQL Thanks for Reviewing my profile.

Hello I am a Senior Full-Stack Developer with 6+ years of experience building modern web applications using React.js, Next.js, Node.js, FastAPI, Supabase, PostgreSQL, and AI-powered technologies. I help startups, SaaS founders, and growing businesses build scalable products that are secure, maintainable, and ready for real users. Over the years, I have worked on healthcare platforms, business management systems, subscription-based SaaS products, AI-powered applications, dashboards, and custom web platforms. I have completed 150+ projects and worked with clients from different industries across the world. Recently, many founders are launching products with AI tools such as Lovable and other AI code generators. These tools are great for rapid development, but as the product grows, issues often appear in authentication, database structure, security, performance, scalability, and code quality. My role is to bridge that gap and transform MVPs into production-ready applications. What I can help with: • React.js and Next.js Development • Full-Stack Web Application Development • Supabase Setup and Architecture • PostgreSQL Database Design • Row Level Security (RLS) Policies • Authentication and Role-Based Access Control • Node.js Backend Development • Python And FastAPI Backend Development • API Development and Integration • AI SaaS Applications • Lovable Application Development and Refactoring • Dashboard and Admin Panel Development • Stripe and Subscription Systems • Performance Optimization • Bug Fixing and Long-Term Maintenance Why clients work with me: ✔ Clean and maintainable code ✔ Fast communication and regular updates ✔ Business-focused problem solving ✔ Scalable architecture for future growth ✔ Reliable long-term support I don't believe in overcomplicated solutions. My goal is to build software that is simple, reliable, and easy to scale. If you are building a SaaS product, improving an existing application, or need a senior developer who can take ownership of the technical side of your project, feel free to send me a message. 📩 Let's build something great together. — Salem

Upwork Stats: 7000+ hours booked with nearly $200k+ Revenue, 100% Completion ratio, and more than 50 satisfied customers. We specialize in responsive web app development for small to medium-sized businesses. Industries we work with - Automotive & Logistics, EdTech, Healthcare, FinTech, Travel, Insurance, Retail, and Real estate Projects. Our core expertise includes (but not limited to): Front-end: HTML, CSS, AngularJS, ReactJS, VueJS, Next.JS, Svelte, Ember.js, Backbone.js NodeJS, Express JS MySQL, PostgreSQL, Firebase, NoSQL, MongoDB, Cassandra, Redis, CouchDB, MariaDB, DynamoDB. TypeScript AWS, AWS Lambda, AWS S3, AWS EC2, AWS RDS, AWS DynamoDB, AWS CloudFront, AWS Route 53, AWS Elastic Beanstalk, AWS CloudWatch With extensive expertise in UI/UX design, I am your go-to resource for all your design needs. My impeccable attention to detail and thorough communication ensures high-speed and effective development at a very competitive rate. ➡️ Our Proficiencies Include: Design Tools: Photoshop, Adobe Illustrator, Adobe XD, Figma Web Technologies: HTML, CSS, Bootstrap, jQuery, SCSS ➡️ We have experience working with RESTful APIs and real-time applications, including performing real-time data visualization. If you have a troubleshooting need or are interested in automating your operation for further growth, then I look forward to hearing more from you. You'll appreciate my work ethic, professionalism, and ability to navigate complex tasks with excellent prompt follow-through.

Data Visualisation Consultant specialising in d3.js with a passion for bringing data to life with this fantastic tool. * React, Angular, Typescript, web apps. * Available at any stage in the project - from raw data through to fully developed Figma design. * UK based * 100% commitment and 100% quality * keeping Upwork customers happy since 2016

I help businesses, startups, and agencies build reliable web applications, custom software solutions, and scalable digital products. My experience includes developing SaaS platforms, AI-powered applications, payment processing systems, custom APIs, and WordPress-based solutions tailored to business requirements. ### Core Expertise • Full Stack Web Development • AI-Powered Applications & Integrations • SaaS Product Development • Payment Gateway Integrations • API Development & Third-Party Integrations • WordPress & WooCommerce Development • Membership & Subscription Platforms • Business Automation Solutions • Performance Optimization & Security ### Technologies **Frontend** * React.js * Next.js * JavaScript * TypeScript * Tailwind CSS **Backend** * Node.js * Express.js * REST APIs * Webhooks **Databases** * PostgreSQL * MySQL * MongoDB **AI & Automation** * OpenAI * Claude * Gemini * LangChain **Payments** * Stripe * Razorpay * PayPal * Authorize.net **WordPress** * Custom Plugin Development * WooCommerce Extensions * Theme Customization * Headless WordPress ### Types of Projects * SaaS Applications * AI Assistants & Chatbots * Booking & Reservation Systems * Property Management Platforms * Marketplace Solutions * Membership Websites * Payment Processing Systems * Custom Business Applications * WordPress Plugins & WooCommerce Extensions I focus on building scalable, maintainable, and business-oriented solutions with clean code and long-term reliability in mind. Feel free to reach out if you'd like to discuss your project.

Ladies & gentlemen, I am a full-stack developer with years of experience in IT, during this time I develop, host, and manage complex web-based software applications. I would be glad to improve the efficiency of your work processes by implementing qualified tools in your current or future system. I have extensive experience in developing internal software with various features and functions (costing, calculations, automation, conversion, etc.) with the possibility of monetization depending on your plans. For complex tasks and calculation-intense problems, I use: - PHP, Laravel, Symfony, Yii2, Zend, Node.js, Next.js - JavaScript frameworks: JQuery, Vue.js, React.js, - Databases, SQL & NoSQL: MySQL, PostgreSQL, Elastic Search, MongoDB I believe in concepts such as communication, accountability, transparency, flexibility, and most importantly, results since my slogan is - '' Do everything 100% or don't bother with it at all'' Best Regards Serhii keywords to find me: • End-to-End Software Development for Startups • Minimum Viable Product (MVP) development • Business Automation • Improvement and customization of existing projects • SAAS solutions • E-commerce • Marketplaces • Social Networks • CRM, ERP, HRM, HMS systems • GPT-3/4, ML integration • Landing Page development • AWS • Digitalocean • Google Cloud Platform • Linode • Custom • Vue.js (Vue, VueJS), Vuetify, Nuxt • React (ReactJS, React.js) • Angular (AngularJS, Angular.js) • Alpine.js • TypeScript (Type Script) • Tailwind • SCSS / LESS • PHP • Laravel • Lumen • Yii, Yii2 • Symfony • CakePHP • Node.js • Adonis.js • PostgreSQL • MySQL (MariaDB) • MongoDB • Firebase • Redis • Elasticsearch • Solr • Amazon Redshift • AWS SQS • RabbitMQ • Laravel Horizon • Apache Kafka • Sentry.io • Snyk • New Relic • Kibana • Opsgene • Node.js • Next.js • Much more

Most products do not fail because of bad code - they fail because nobody thought about architecture before writing it. As a Top Rated Plus Full Stack Developer and Mobile App Developer with a 100% Job Success Score on Upwork, I bring that thinking to every project, from MVP to production scale. I'm a Full Stack Developer, Mobile App Developer, and Backend Developer focused on production-ready software that holds up under real-world usage. My work sits at the intersection of Software Developer, Senior Web Developer, and SaaS Development specialist, with a backend-first mindset and deep attention to scalability and maintainability - from React Native and Flutter on mobile to Python, Node.js, and Laravel on the backend. As a Full Stack Developer and Backend Developer, I own every layer, from React components to AWS architecture. Core Specializations Full Stack Web & API Development As a Web Developer and React Developer comfortable across the entire stack, I build end-to-end solutions using React, Vue, Next.js, and TypeScript on the frontend, paired with Python (FastAPI, Django, Flask), Node.js, and Laravel on the backend. As a Front End Developer handling Web Design and component architecture, while I have previously worked as a Wordpress developer, my current focus is on custom SaaS Development and API-driven systems. As a Full Stack Developer, I own delivery from database schema to deployed product. Scalable Backend Architecture As a Python Developer and Node.js specialist, I build robust APIs for high concurrency - including SaaS Developer products that require multi-tenant architecture and subscription logic. As a Backend Developer, I focus on stable systems - REST or GraphQL - that handle complex business logic without performance degradation. As a DevOps-minded Full Stack Developer, I manage deployment pipelines and infrastructure as code across AWS and Microsoft Azure environments. Performance Optimization & Systems Recovery As a Full Stack Developer specializing in Mobile App Developer work, I resolve critical bottlenecks across mobile and web - reducing React Native app startup times, fixing memory leaks in Flutter apps, and resolving crashes in Swift and Kotlin codebases. Whether working as an Android Developer or iOS Developer, this is where my depth as a Mobile App Developer makes a difference in retention. AI-Integrated Mobile App Developer Work As a Full Stack Developer focused on Mobile App Developer work, I deliver intelligent cross-platform mobile apps as a React Native Developer and Flutter Developer, with native experience in Swift and Kotlin. I integrate OpenAI API, LangChain, and RAG systems for AI and API Integration that feels native and responsive on both iOS and Android, covering the full lifecycle from design and testing to App Store and Play Store deployment. Data & Cloud Infrastructure As a Full Stack Developer and AWS Architect, I bring deep expertise in AWS (Lambda, S3, DynamoDB), Microsoft Azure, PostgreSQL, and Redis. As a DevOps-focused engineer, I protect sensitive user data across Web, Android, and iOS platforms. When projects require AI-powered functionality, I bring hands-on experience integrating AI into backend and mobile systems alike. This allows me, as a SaaS Developer, to deliver AI Integration that is reliable, observable, and cost-controlled rather than experimental. Clients typically work with me when they need: - a Full Stack Developer who can own frontend and backend - a Mobile App Developer with React Native, Flutter, and native iOS/Android experience - a Senior Web Developer or Backend Developer experienced with real production systems - AI Integration and API Integration for existing or new platforms - a SaaS Developer who understands long-term scalability constraints - AWS Architect or Azure-based cloud infrastructure - MVPs that can realistically evolve into long-term SaaS Development products Technical Expertise - Mobile: React Native, Flutter, Swift, Kotlin, TypeScript, Redux Toolkit, React Query - Frontend: React, Vue, Next.js, TypeScript, Tailwind CSS - Backend: Python (FastAPI, Django, Flask), Node.js, Laravel, PHP, REST & GraphQL - AI & Automation: OpenAI API, LangChain, Vector Databases, RAG, AI Machine Learning - Data & Cloud: AWS (S3, Lambda, DynamoDB), Microsoft Azure, PostgreSQL, Redis - Tools: Docker, CI/CD, Git, Stripe, DevOps pipelines Professional Approach Having worked across Wellness, Fintech, Healthcare, and SaaS Development as a Full Stack Developer and Mobile App Developer, I provide architecture that scales, transparent communication, and end-to-end delivery from database schema to cloud deployment on AWS and Azure. I do not take on Wordpress developer projects, SaaS marketing, Google Ads, or Digital Marketing services. If you need a Full Stack Developer or Mobile App Developer to own the roadmap from MVP to production scale - let us discuss your project on Upwork.

Senior Frontend / Fullstack JavaScript Engineer with strong experience in building scalable web applications using React, Next.js, Node.js, and TypeScript. I focus on clean architecture, maintainable code, performance, accessibility, and delivering reliable UI solutions for complex platforms. Frontend Expertise I build fast, responsive, accessible interfaces using React and Next.js. Experienced in component architecture, state management (Redux Toolkit, RTK Query, Zustand), design systems, and performance optimization. Skilled in Tailwind CSS, Material UI, Ant Design, and modern frontend tooling. Full Stack Expertise I develop backend services and APIs using Node.js, NestJS, and Express.js. Experienced with REST/GraphQL integrations, authentication flows, data handling, and building dashboards and internal tools that support business operations. Key Skills & Technologies Frontend React • Next.js • TypeScript • JavaScript (ES6+) Redux Toolkit • RTK Query • Zustand • React Query HTML5 • CSS3 • SCSS/Sass • Styled‑Components Tailwind CSS • Material UI • Ant Design • Chakra UI Accessibility (WCAG) • Responsive Design • Performance Optimization Microfrontends • Jest • React Testing Library • Cypress Backend & API Node.js • NestJS • Express.js REST API • GraphQL PostgreSQL • MongoDB DevOps & Infrastructure Docker • Kubernetes AWS (Lambda, S3, CloudWatch, Glue) CI/CD (GitHub Actions, GitLab CI, Bitbucket Pipelines) Tools & Workflow Webpack • Vite • Axios • Swagger • Postman Git • GitHub • GitLab • Bitbucket ESLint • Prettier • Agile (Scrum, Kanban)

𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐄𝐱𝐩𝐞𝐫𝐭 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐏𝐥𝐮𝐬 | 𝐄𝐱𝐩𝐞𝐫𝐭 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐖𝐞𝐛 𝐃𝐞𝐬𝐢𝐠𝐧 | 𝐄𝐱𝐩𝐞𝐫𝐭 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐋𝐢𝐪𝐮𝐢𝐝 𝐂𝐨𝐝𝐢𝐧𝐠 𝐄𝐱𝐩𝐞𝐫𝐭 | 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐀𝐩𝐩𝐬 | 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 ✦Shopify Expert | Custom Development | Performance Optimization✦ With over 8 years of experience and 100+ successful Shopify projects, I specialize in transforming eCommerce stores into high-converting, visually stunning, and high-performing businesses. I don’t just code—I strategize, optimize, and enhance every aspect of your Shopify store to ensure you get the best results possible. Unlike most freelancers, I go 10 steps further by proactively suggesting improvements based on data, research, and industry best practices. 💡 How I Can Help You: ✅ Custom Shopify Theme Development (From Figma/Adobe XD to Shopify) ✅ Theme Customization & Shopify Plus Enhancements ✅ Speed Optimization (Faster loading = Higher conversions 🚀) ✅ CRO (Conversion Rate Optimization) (Maximize sales with smart tweaks) ✅ SEO Optimization (More organic traffic, better rankings) ✅ App Integration & API Development (Custom plugins, third-party services) Let’s build something amazing together! 🎯 📅 Book a quick 10-minute intro call to discuss your project and see if we’re a good fit. #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐄𝐱𝐩𝐞𝐫𝐭 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐭𝐨𝐫𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐄-𝐜𝐨𝐦𝐦𝐞𝐫𝐜𝐞 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 #𝐂𝐮𝐬𝐭𝐨𝐦 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐓𝐡𝐞𝐦𝐞 𝐂𝐮𝐬𝐭𝐨𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 #𝐂𝐮𝐬𝐭𝐨𝐦 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐓𝐡𝐞𝐦𝐞𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐖𝐞𝐛𝐬𝐢𝐭𝐞 𝐂𝐮𝐬𝐭𝐨𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧# 𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐏𝐥𝐮𝐠𝐢𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐏𝐥𝐮𝐬 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐏𝐥𝐮𝐬 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐏𝐚𝐲𝐦𝐞𝐧𝐭 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐏𝐚𝐲𝐦𝐞𝐧𝐭 𝐆𝐚𝐭𝐞𝐰𝐚𝐲𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐂𝐡𝐞𝐜𝐤𝐨𝐮𝐭 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐭𝐨𝐫𝐞 𝐌𝐢𝐠𝐫𝐚𝐭𝐢𝐨𝐧 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐭𝐨𝐫𝐞 𝐒𝐞𝐭𝐮𝐩 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐭𝐨𝐫𝐞 𝐑𝐞𝐝𝐞𝐬𝐢𝐠𝐧 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐩𝐞𝐞𝐝 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐭𝐨𝐫𝐞 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐒𝐄𝐎 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 #𝐒𝐡𝐨𝐩𝐢𝐟𝐲 𝐌𝐨𝐛𝐢𝐥𝐞 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬.