Full-Stack & Chrome Extension Developer

Job Title: Full-Stack & Chrome Extension Developer – Build E-Commerce Automation Tool & Web Platform (Manifest V3) Job Description: We are looking for an experienced full-stack developer / browser extension specialist to build an e-commerce automation suite for marketplace sellers (targeting Meesho, Flipkart, and Amazon seller portals). This project includes both a Chrome Extension (Manifest V3) and a companion web platform with user authentication and payment billing. Key Deliverables: 1. Chrome Extension (Manifest V3): - 1-Click Form Autofill: Native Side Panel UI where users manage reusable product data templates (HSN, GST, materials, attributes, descriptions) and inject 30–50+ fields into seller listing forms instantly. - Shipping Cost Calculation & Optimization: Automate testing of product dimensions, weight classes, and image variant setups inside the seller panel to identify the lowest possible platform shipping fees. - Secure Licensing Engine: Content scripts and background workers verify user active access via API before unlocking features. 2. Web Platform & Payment Integration: - Modern, responsive landing page detailing product features and subscription tiers. - User account system (Sign up / Login / Profile management). - Integrated payment gateway (e.g., Razorpay, Stripe) to manage monthly/quarterly subscription checkouts. - Backend API to handle authentication tokens, active subscription statuses, and license verification. 3. Long-Term Maintenance: - Ongoing updates and selector adjustments whenever target marketplace portals update their DOM structure. - Regular maintenance, feature additions, and Chrome Web Store compliance updates. Compensation & Contract Terms (All within Upwork): - Phase 1 (Core Build): Fixed-Price milestones via Upwork Escrow for the Extension MVP, Web Platform, and Payment flow. - Phase 2 (Ongoing Support): Continued collaboration via Upwork Hourly contract or regular monthly milestone retainers with performance bonuses paid exclusively through Upwork. Requirements: - Proven experience developing and deploying Manifest V3 Chrome Extensions with dynamic DOM automation. - Solid full-stack skills (React/Next.js, Node.js, Python, or Firebase/Supabase). - Hands-on experience integrating payment gateways and subscription workflows. - Understanding of dynamic Single Page Applications (SPAs) and seller dashboard workflows. To Apply: 1. Provide examples, links, or demos of Chrome extensions and web apps you have built. 2. Outline your recommended tech stack for the extension, backend, and database. 3. Share your estimated timeline for the Phase 1 MVP build.