Full Stack Developer (React.js | Node.js | NestJS) at Plus91 Technologies Pvt. Ltd. (2022-04 – Present)
Building scalable full stack applications and microservices for healthcare and e-commerce platforms — frontend, backend, cloud deployment, and performance optimization.
Pharmacy & Multi-Vendor Inventory Management Platform at Plus91 Technologies Pvt. Ltd. (2022-04 – Present)
Scalable pharmacy and multi-vendor platform for inventory, product catalog, vendor management, authentication, and order workflows.
- Designed 40+ secure REST APIs for product, inventory, vendor, and user management, including payment gateway and WhatsApp Business webhook integrations for order/delivery notifications.
- Developed reusable, responsive React.js components using custom hooks, React Router, Context API, lazy loading, and memoization, improving front-end load performance by nearly 35%.
- Implemented JWT authentication, Redis caching, centralized error handling, and API security best practices, improving API response times by up to 40%.
- Built independent NestJS microservices for subscription billing, notification service, and payment integration, decoupling these workflows from the core monolith for independent scaling and deployment.
- Integrated third-party notification channels — WhatsApp Business API and email — into the NestJS notification service for real-time order and delivery alerts.
- Built asynchronous Excel bulk-upload processing using worker threads and improved scalability using Node.js Cluster for large product datasets.
- Containerized Redis and PDF-generation services with Docker; automated AWS (EC2, S3, Load Balancer) deployments via Jenkins CI/CD, cutting release time by nearly 50%.
- Investigated and resolved 60+ production issues, improving backend performance and maintainability.
- Developed unit tests using Jest, improving backend code coverage and reliability.
Multi-Vendor E-Commerce Platform at Personal Project
Self-initiated subscription-based multi-vendor marketplace enabling vendors to list and sell products under tiered subscription plans, with integrated payments, analytics, and real-time support.
- Built subscription-based vendor onboarding with tiered plans, controlling vendor access to product limits, storefront features, and payment settlement cycles.
- Designed and integrated a payment module supporting vendor subscription billing and customer checkout, with webhook-driven order and payment status updates.
- Developed a vendor dashboard with product upload, inventory tracking, and an automated profit & loss report per vendor, aggregating sales, cost, and margin data.
- Rebuilt the subscription billing, notification, and payment modules as standalone NestJS microservices, enabling independent scaling and deployment from the core marketplace API.
- Integrated WhatsApp and email as third-party notification channels into the NestJS notification microservice for order updates, low-stock alerts, and subscription renewals.
- Built a WebSocket-based tech-support chat application for real-time buyer-vendor and buyer-support communication, backed by Redis for session and presence management.
- Scheduled cron jobs for subscription renewal checks, vendor billing cycles, and stale-cart/order cleanup.
- Applied a circuit breaker pattern around third-party payment and notification calls to prevent cascading failures during upstream outages.
- Used PM2 for process management and Node.js clustering to utilize multiple CPU cores, and load-tested critical APIs to validate throughput before scaling.
- Applied core system design principles — service separation, caching layers, and queue-based decoupling — to keep the platform maintainable and horizontally scalable.
Hospital Management System (HMS) at Plus91 Technologies Pvt. Ltd.
Enterprise healthcare platform (patient registration, OPD/IPD, billing, pharmacy, appointments). Developed 25+ REST APIs and backend modules, designed a microservice-based Tax Calculation service, optimized MySQL reporting queries by ~75% (1.8s → 400ms), and resolved 50+ production issues — improving overall application performance by nearly 30%.
