Rajvir Singh

I've built production web and mobile applications at Oneair using React, React Native, Node.js microservices, PostgreSQL, and AWS event-driven infrastructure. I architected reliable systems with REST APIs, role-aware middleware, security policies, background processing, and production monitoring.

At Techlive Solutions, I built Feasto, a food-ordering platform with customer interfaces, admin dashboards, REST APIs, JWT authentication, Razorpay payments, file uploads, and MongoDB optimizations.

As a freelance blockchain developer, I delivered secure Solidity smart contracts and TypeScript integrations for 10+ DeFi and DAO projects, with zero mainnet security incidents. I also developed decentralized exchange features during GirlScript Winter of Blockchain, improving transaction throughput by 25%.

I'm grounded in data structures and algorithms, design patterns, system architecture, and clean engineering practices, with experience across AWS, PostgreSQL, MongoDB, Docker, CI/CD, and blockchain tooling.