Open to opportunities

Sagar Kumar

@sagarkumar4

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Full-stack developer building scalable web apps with React, Node.js, APIs, and performance-focused user experiences.

India

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What I'm looking for

I’m looking to build scalable, business-impactful web applications—owning REST APIs, authentication, and responsive UI work—while continuously improving performance and writing clean, maintainable code in a collaborative team.

I’m a Full Stack Developer with 2+ years of experience building scalable web applications. I focus on clean, maintainable code while designing REST APIs, authentication systems, responsive UIs, and performance improvements that move real metrics—like reducing load time by 25%.

At Krishna Techs, I built React-based client dashboards with reusable components and developed LinkBase, a QR-based WiFi access platform using the MERN stack. I’m also developing 25+ REST APIs for an LMS platform at SSINFORMATICS using Node.js, Express.js, and MySQL, cutting API errors through centralized validation and authentication.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer

Current

SSINFORMATICS

Apr 2026 - Present (3 months)

Developed 25+ REST APIs for an LMS platform using Node.js, Express.js, and MySQL to support course management, authentication, and student workflows. Reduced API errors by implementing centralized validation and authentication.

REST API Development MySQL Authentication Systems LMS Development Backend Development SQL

Full Stack Developer

Krishna Techs

Aug 2023 - Nov 2025 (2 years 3 months)

Built React-based client dashboards with reusable components, optimizing performance to improve load time by 25%. Developed and maintained LinkBase, a QR-based WiFi access platform using the MERN stack.

React REST API Development MongoDB MySQL Authentication Systems Performance Optimization MERN Stack