Prasanna K.

I’m a Full-Stack Developer with 4+ years of professional experience building production-ready web applications, SaaS platforms, REST APIs, payment systems, and complex third-party integrations. My core expertise is Node.js, Express.js, NestJS, React.js, Next.js, TypeScript, MySQL, and MongoDB. I work across the complete development lifecycle — from architecture and database design to development, API integrations, deployment, and production support. 🚀 Full-Stack Web Applications • React.js / Next.js applications • Node.js / Express.js / NestJS backends • Admin dashboards and business management systems • SaaS applications • Responsive and scalable UI 🔗 API & Third-Party Integrations • REST API development • Third-party API integrations • Webhooks and event-driven integrations • Property management and booking APIs • Smart-lock and access-control integrations • Messaging and automation integrations 💳 Payment Integrations • Stripe • PayPal • Razorpay • PayU • PaymentIntents, SetupIntents and webhooks • Subscription and payment workflows 🔐 Backend & Security • JWT authentication • OAuth 2.0 • Role-based access control • API validation • Error handling and logging • Secure API architecture 🗄️ Databases • MySQL • MongoDB • PostgreSQL • Sequelize • TypeORM • Mongoose • Database design, migrations and query optimization ☁️ Deployment & Infrastructure • AWS EC2 • AWS Route 53 • DigitalOcean • VPS environments • Nginx / Apache • Docker • PM2 • SSL configuration • Production deployment and troubleshooting Why clients work with me I don't just focus on making a feature "work." I focus on building reliable, maintainable, and production-ready software. You can expect: • Clean and maintainable code • Scalable backend architecture • Well-structured REST APIs • Proper validation and error handling • Secure authentication and authorization • Database optimization • Clear communication and regular updates • Proper handling of third-party integrations and webhooks • Production deployment and troubleshooting • Long-term support when required I can work with an existing codebase and extend or improve it, or help build a new application from the ground up. Whether you need a new SaaS product, backend/API development, a React or Next.js application, payment integration, third-party API integration, or help maintaining and scaling an existing system, I'd be happy to discuss your requirements.