Nishan Rajapaksha

Architected and deployed production-grade web applications using Next.js 15 (App Router), React 19, and Node.js, serving
enterprise clients, including major hospitality organizations in the Middle East.
Designed and implemented RESTful APIs and WebSocket (Socket.io) servers for real-time reservation updates, notifications,
and live availability tracking.
Managed and provisioned AWS infrastructure, including EC2 instances and RDS PostgreSQL/MySQL databases for both
production and staging environments.
Administered Ubuntu Linux servers with PM2 process management, configured SSL/HTTPS certificates, and maintained
environment-based deployments across multiple client projects.
Engineered database solutions using Prisma ORM with 185+ models across PostgreSQL, covering schema design, migrations,
indexing strategies, and query optimization for high-volume datasets.
Built a multi-tenant loyalty engine with points, tiers, a wallet system, referral programs, gift cards, and rule-based discounts
management for restaurant chains.
Integrated multiple payment gateways (Adyen, Geidea, HyperPay) with full webhook processing pipelines, automated
refund handling, and reconciliation workflows.
Implemented Apple Wallet digital loyalty card generation (PKPass format) and Oracle Simphony POS integration for
seamless in-restaurant loyalty redemption.
Developed authentication systems using NextAuth v5 with RBAC, credential login, and OAuth; debugged and resolved
critical production issues, including Prisma errors and security vulnerabilities.
Built and maintained n8n automation workflows for API-driven integrations, scheduled monitoring, and inter-system data
sync; delivered all projects with comprehensive client documentation.

Contributed to the PEER web application for the Asian Disaster Preparedness Center (ADPC), a multi-language disaster
management platform used across Asia.
Developed reusable React TypeScript components with Material-UI customization, implementing i18n internationalization
for multi-language support across the application.
Integrated React Query for data fetching, caching, and state management; built error-resilient frontends with graceful
degradation for backend failures.
Managed role-based authentication and authorization for frontend components; validated backend APIs using Postman and
Thunder Client, maintaining code quality with best practices.
Collaborated with cross-functional teams using Bitbucket for version control; assisted in frontend architecture decisions and
provided technical recommendations to senior engineers.