Shadab M.

⭐ Top Rated | 100% Job Success 🚀 Senior Full-Stack Engineer specialising in SaaS, marketplaces and e-commerce 🛒 Strong experience with Sharetribe, marketplace development and Stripe integrations ⚙️ $90K+ earned across 40+ Upwork projects 💻 Ruby on Rails, React, Node.js, React Native, Shopify, Spree, APIs and PostgreSQL I help startups, founders and established businesses build, extend and modernize production web applications, SaaS products and marketplace platforms. My strongest areas are Ruby on Rails, React, Node.js, Sharetribe and Shopify. I am particularly experienced with existing products that need new features, third-party integrations, performance improvements, refactoring, bug fixing or ongoing development. What I can help you with: • SaaS product development • Ruby on Rails development and modernization • Marketplace development with Sharetribe • Sharetribe Go and Sharetribe Flex customization • E-commerce and Shopify development • React and Node.js applications • React Native mobile applications • REST and GraphQL APIs • Stripe and payment integrations • Third-party API integrations • Backend architecture and database optimization • Performance optimization and refactoring • Bug fixing and ongoing product development • AI-powered application features and integrations Tech stack: Ruby on Rails, Ruby, React, Node.js, Express, React Native, Sharetribe, Shopify, Spree, PostgreSQL, MySQL, MongoDB, Redis, Supabase, REST APIs, GraphQL, Stripe and third-party APIs. I have worked on long-term SaaS products as well as marketplace platforms, including projects involving complex backend workflows, payments, APIs, integrations and customer-facing applications. My approach is simple: understand the existing product, solve the actual business and technical problem, and deliver maintainable code that can continue to evolve. Whether you need a senior developer for a new SaaS product, help extending an existing marketplace, a Rails/React developer for ongoing work, or someone to troubleshoot and modernize an existing application, I can help. Let's discuss what you're building and where you need help.