Chaudhry Saif u.

Looking for an expert to engineer custom Shopify Apps, Shopify Functions, or custom Ruby on Rails backends? I help store owners and agencies design, build, and deploy high-volume Shopify integrations and custom solutions seamlessly. As a Top Rated Shopify App & Full-Stack Developer with a 100% Job Success Score, I help Shopify Plus merchants, store owners, and agencies build robust, high-performance custom apps, complex API integrations, and scalable Ruby on Rails backends. Whether you need a private custom app for your store, a public SaaS app listed on the Shopify App Store, or a custom ERP/inventory sync, I deliver clean, secure, and maintainable code built on modern Shopify standards. What I Can Build & Help You With: Custom Shopify App Development: Public and private app development from scratch using Ruby on Rails, Node.js, and React (Polaris UI). Modern Shopify Features: Implementation of Shopify Functions, Checkout Extensions, Theme App Extensions, and Webhooks. Complex API & System Integrations: Connecting Shopify with ERPs, CRMs, inventory systems, logistics, and third-party REST / GraphQL APIs. Shopify Plus Customization: Advanced checkout modifications, custom subscription logic, and enterprise-grade backend workflows. Full-Stack Web Development: Custom Ruby on Rails web applications, PostgreSQL database architecture, background job processing (Sidekiq), and cloud deployments (AWS, Heroku, VPS). Core Tech Stack & Expertise: Shopify Ecosystem: Shopify APIs (GraphQL & REST), Shopify Plus, Admin API, Storefront API, Polaris UI, Liquid, Theme App Extensions. Backend: Ruby on Rails, Node.js, Ruby, PostgreSQL, Redis, RESTful APIs, GraphQL. Frontend: React.js, Remix, JavaScript (ES6+), HTML5/CSS3. DevOps & Cloud: AWS, Heroku, Docker, Git, VPS setup (Contabo, DigitalOcean), Bash Scripting. Why Work With Me? 1. Proven Track Record: Top Rated status on Upwork with a 100% Job Success Rate across 20+ successful projects. 2. Modern Architecture: Built strictly using up-to-date Shopify standards (Shopify Functions, Checkout Extensibility, GraphQL API). 3. End-to-End Ownership: From database design and backend APIs to frontend UI design and app store submission/deployment. Got a custom app idea or a complex Shopify integration challenge? "Book a Consultation" above to discuss your project!