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Job Title: Lead Full-Stack Developer ([login to view URL] / Node.js) – E-commerce WMS & Shopify Integration Job Description: We are an e-commerce brand looking for an expert Full-Stack Developer ([login to view URL] + Node.js/TypeScript) to take over the ongoing maintenance, security, and continuous development of our custom-built Warehouse Management System (WMS). You will not be building this from scratch. The system is already live and fully operational. We own the GitHub repository and infrastructure, and we need a reliable, long-term technical partner to manage the codebase, fix bugs, build new features, and maintain clear documentation. Our Tech Stack: Frontend: [login to view URL] (React) Backend: Node.js with TypeScript Database: PostgreSQ Hosting/Infrastructure: Serverless / PaaS cloud environment Key Integrations: Shopify GraphQL API, 3rd-Party Courier/Logistics APIs, Transactional Email/SMS APIs, and Meta/WhatsApp Developer APIs. Your Responsibilities: Codebase Takeover & Audit: Review the existing repository, set up your local environment, and identify any technical debt. Security & Access Audit: Review backend authorisation logic to ensure strict security protocols. Ongoing Maintenance & New Development: Monitor system stability, resolve daily bug reports from the warehouse team, and build new features and UI enhancements as our operations scale. Performance Optimisation: Ensure high-volume PDF shipping label generation and high-frequency background cron jobs (do not cause memory leaks or server timeouts. Technical Documentation: Create, update, and actively maintain comprehensive documentation for the system architecture, API workflows, and codebase changes so our internal engineering team remains aligned. Required Experience: Deep expertise in Node.js, TypeScript, and Next.js. Proven experience working with the Shopify GraphQL API (REST experience is not enough). Experience building or maintaining WMS, ERP, or heavy inventory logistics applications. Solid understanding of PostgreSQL and relational database optimization. Strong habit of writing clean code and detailed technical documentation. Engagement Model: We are looking for a long-term, ongoing relationship (Monthly Retainer or Weekly Hourly limit). Please state your required monthly or hourly rate in your proposal.
Project ID: 40479263
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70 freelancers are bidding on average ₹26,614 INR for this job

Hello there i am a js/ts web programmer i can create, test, debug, integrate, deploy, and document any js/ts app i've an extensive experience with gql, sql, aws, yaml, psql, and more whatever is required i can code it monthly pls contact me Thanks, Nader
₹99,000 INR in 30 days
4.8
4.8

Hello, I can create a modern, responsive, and professional website tailored to your business goals and target audience. What I Offer: Premium UI/UX Design Fully Responsive (Mobile, Tablet & Desktop) Fast Loading & SEO-Friendly Website E-Commerce Functionality (if required) Booking & Appointment Systems Modern Animations & Interactive Features Secure Contact Forms & Integrations Clean, Scalable, and Professional Development My Approach: Understand your business requirements and goals Create a modern and user-friendly design Develop a responsive, high-performance website Optimize for speed, SEO, and user experience Test across all devices and browsers Provide support after project completion I focus on delivering websites that not only look great but also help generate leads, improve customer engagement, and grow your business. Looking forward to discussing your project in detail. Best Regards.
₹20,000 INR in 10 days
4.0
4.0

Hi, I’m a Senior Full Stack Developer(12 Years Experience) with strong experience building scalable mobile and backend systems using React Native, Node.js, and modern API-driven architectures. I’ve worked on end-to-end application development — from React Native frontend development to backend APIs, cloud deployment, third-party integrations, payment systems, authentication flows, and real-time features. My expertise includes: • React Native (cross-platform iOS & Android apps) • Node.js / Express backend architecture • REST APIs & GraphQL integrations • Firebase, AWS, Supabase, MongoDB, PostgreSQL • Stripe, PayPal, Twilio, OAuth, and third-party API integrations • WebSockets / real-time systems • Performance optimization & scalable architecture • CI/CD deployment pipelines and production releases I’m comfortable taking ownership of the complete technical flow: * Designing scalable backend systems * Building high-performance mobile apps * Integrating external platforms and cloud services * Optimizing app performance and API reliability * Managing deployment and production infrastructure I focus on writing clean, maintainable code and delivering reliable products that scale well in production environments. I’d be happy to discuss your project requirements, architecture goals, and how I can help lead development effectively. Looking forward to hearing from you. Best regards Eng Manirul Islam
₹25,000 INR in 30 days
1.0
1.0

Codebase Audit & Environment Setup Clone and review the GitHub repository. Configure local/staging environments. Analyze architecture, dependencies, deployment pipelines, and technical debt. Deliver an audit report with prioritized improvements. Security & Access Review Audit authentication and authorization flows. Verify role-based permissions for warehouse staff, admins, and integrations. Review API security, secrets management, and data protection practices. Fix vulnerabilities and strengthen access controls. Performance & Database Optimization Review PostgreSQL schema, indexes, and query performance. Optimize high-volume shipping label generation processes. Analyze background cron jobs and queue handling to prevent memory leaks and timeouts. Shopify & Third-Party Integration Management Maintain and enhance Shopify GraphQL API integrations. Monitor courier, email/SMS, and Meta/WhatsApp integrations. Improve error handling, logging, and synchronization reliability. Ongoing Development & Bug Fixes
₹40,000 INR in 15 days
0.0
0.0

Hi, I have strong experience in React.js, Node.js, MySQL, PostgreSQL, Redis, microservices, and deployment processes. I have also implemented Shopify integrations using GraphQL APIs, including webhook handling, synchronization, and production-level integrations. A significant part of the work on Salesmate has been developed and maintained by me, so I have hands-on experience building scalable and high-performance systems used by real customers. After reviewing your requirements, I believe the existing project needs substantial optimization and restructuring to achieve the stability, performance, and maintainability you're looking for. This is not just a small fix; it requires careful development and testing to ensure a reliable solution. Because of my experience with similar projects, I can deliver a clean, scalable, and production-ready implementation. While your current budget is lower than what this scope typically requires, I've already offered a competitive price because this would be our first opportunity to work together. If you're looking for quality work done correctly rather than quick patches, I'd be happy to help. Looking forward to discussing the project. Best Regards
₹75,000 INR in 20 days
0.0
0.0

I am a Software Development Engineer at a FAANG company with 2 years of experience. I am a quick learner as well and have worked on project with tech stack Node.js, React.js, JS, MongoDB, REST API, etc..so i can do this project more efficiently and quickly.
₹30,000 INR in 7 days
0.0
0.0

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