I'm Subharthi Hazra, a Software Developer from Kolkata, India !

Built an Al-powered employee management app for MSMEs with a pixel-perfect, responsive UI in React (Next.js) and robust Node.js APIs integrated with PostgreSQL for HR workflows. Engineered an agentic WhatsApp-operable chatbot using LangChain with LLMs to answer queries and trigger backend actions, keeping workflows conversational and automated. Deployed and optimized on AWS EC2 with Nginx as reverse proxy and S3 for storage, ensuring secure, reliable hosting.

Implemented OAuth for secure phone number verification, improving user authentication workflows. Integrated Stripe to enable saving and managing user payment methods, streamlining experience. Developed and enhanced core application features using Ruby on Rails for backend and Expo (React Native) for the mobile and web interface.

Worked on developing a Chrome extension for generating portfolios from LinkedIn by scraping data, utilizing LLM (OpenAI) for enhanced data processing. Worked on creating another Chrome extension to generate tailored resumes for specific job postings on LinkedIn, leveraging LLM (OpenAI).

Built an industry-agnostic Al-powered lead qualification system that simulates human-like conversations, classifies intent (Hot, Cold, Invalid), extracts structured metadata, and maintains persistent transcripts. Designed with multi-mode support (CLI, API, Web Dashboard) and configurable industry profiles, integrating LLM via Langchain for smart prompt-based dialogue and lead classification.

Developed a TypeScript OAuth2 client library supporting both client-side and server-side implementations, with Zod for validation, ensuring type safety and robust error handling. Integrated PKCE for secure authorization and ensured compatibility with Kinde, Auth0 and Clerk.

A one stop platform for all Pet related problems, with the features to rehome and adopt a pet, and know more about pets with a magical touch of AI.

AI powered mental health chat assistance

This is a multiplayer Snakes and Ladders Game that can be played together in real-time through internet