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Kislay Gupta

@kislaygupta

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Full Stack Developer modernizing systems and building RAG-powered web and mobile apps.

India

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What I'm looking for

I want to build scalable products end-to-end—modernizing legacy systems, shipping high-performance React/Node apps, and creating AI-powered features like RAG chatbots—while collaborating with engineering and domain teams on meaningful impact.

I’m a Full Stack Developer building scalable web and mobile applications with React, Next.js, Node.js, TypeScript, PostgreSQL, and MongoDB. I focus on modernizing legacy systems, optimizing performance, and designing scalable APIs that teams can confidently extend.

At Bytzsoft Technologies, I’m leading the migration of an Aviation Management System from VB.NET to a modern MERN stack with PostgreSQL. I designed Node.js/Express REST APIs, rebuilt legacy UI modules with reusable React components, and optimized PostgreSQL schemas, indexing, and query performance for high-volume operational data.

I also built an AI-powered customer RAG chatbot for semantic search and intelligent retrieval across internal documentation. Previously, at Sparkovationhub Pvt. Ltd., I modernized the BNMU University website by migrating from WordPress to a React + TypeScript + Node.js stack and achieved 90+ Lighthouse performance and SEO scores through rendering and API integration improvements.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer

Current

Bytzsoft Technologies

Nov 2025 - Present (7 months)

Led migration of a legacy Aviation Management System from VB.NET to a modern MERN stack with PostgreSQL. Designed REST APIs and built a customer-specific RAG chatbot for semantic search across internal operational documentation, while optimizing PostgreSQL schemas and query performance for high-volume data.

MERN Stack REST APIs React PostgreSQL RAG Bots Semantic Search API Integration

Frontend / Full Stack Developer

Sparkovationhub Pvt. Ltd.

Mar 2024 - Oct 2025 (1 year 7 months)

Developed production web applications using React, Next.js, Node.js, and MongoDB, including modernizing the BNMU University site from WordPress to a React + TypeScript + Node.js stack. Improved performance to achieve 90+ Lighthouse performance and SEO scores, built dynamic CMS modules and dashboards with authentication flows, and supported mentoring through project-based learning.

React Next.js TypeScript MongoDB Lazy Loading