Devanshu koli

I’m a backend-focused Software Engineer specializing in Node.js, TypeScript, and Database Architecture. I design secure REST APIs, optimize complex SQL/NoSQL queries, and build robust authentication systems using JWT and OAuth.

In my recent role, I led backend ownership for a client-facing corporate admin dashboard handling sensitive legal/company data. I enforced JWT and role-based access, refactored legacy MSSQL queries into parameterized queries to eliminate injection vectors, and built reusable Express middleware for rate limiting, validation, and centralized error handling.

I’ve integrated billing and payment gateways, authored secure server-side transaction routes, and implemented social authentication using Passport.js + OAuth for streamlined onboarding. I also contributed to API-to-React frontend integration to keep backend and UI working smoothly together.

Across projects, I’ve delivered RESTful APIs with Express, designed scalable database schemas, and improved performance by optimizing MySQL queries and indexing strategies. I’m passionate about building scalable server-side systems, DevSecOps practices, and high-availability applications.