Devanshu koli

I’m a backend-focused MERN developer with hands-on experience building secure, production-ready applications that solve real client problems. Over the past few years, I’ve worked across corporate dashboards, billing systems, and payment integrations — taking ownership of API design, authentication flows, database optimization, and security remediation. I’ve fixed SQL injection vulnerabilities, implemented JWT and OAuth authentication, integrated payment gateways and Zoho Billing, and improved API performance by up to 40%. While backend is my core strength (Node.js, Express, MongoDB, MySQL), I’m comfortable working across the stack. I’ve contributed to React, Next.js, and Vue frontends, introduced Storybook for UI development, and added Jest and Playwright for automated testing to ensure stability in production. I enjoy working in fast-moving environments where I can take responsibility, ship features end-to-end, and improve systems beyond just writing code. I’m currently looking for a MERN-focused role where I can contribute as a strong backend engineer while continuing to grow into full-stack ownership.