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Kroy665/README.md

Hi, I'm Koushik Roy 👋

Full-Stack & AI Engineer  ·  M.Sc. Mathematics  ·  5 years experience

I build production-ready AI systems and full-stack applications — from LLM agents and MCP tool servers to mobile apps and scalable APIs. My M.Sc. in Mathematics means I don't just use AI as a black box; I understand the math underneath.

Portfolio   LinkedIn   Upwork   Profile views


🤖 AI & LLM Engineering

LLMs  ·  MCP (Model Context Protocol)  ·  Function Calling  ·  RAG Pipelines
AI Agents  ·  Model Fine-tuning  ·  OpenAI API  ·  Anthropic API  ·  LangChain
PyTorch  ·  TensorFlow  ·  NumPy  ·  pandas  ·  ChatGPT API

I design and build AI systems end-to-end — from architecture to deployment. Specialties include building MCP tool servers, designing function-calling pipelines, training and fine-tuning models, and integrating LLMs into production applications.


🛠️ Tech Stack

Languages

Python TypeScript JavaScript C++ HTML CSS3 Sass

Frontend

Next.js React Vue.js React Native Tailwind CSS

Backend

Node.js Express.js Python REST API

AI / ML

PyTorch TensorFlow LangChain NumPy pandas

Databases

PostgreSQL MongoDB MySQL Redis Firebase SQLite Elasticsearch Microsoft SQL Server

Cloud & DevOps

AWS Amazon EC2 Docker GitHub Actions GitLab Cloudflare NGINX GitHub Copilot


📐 Mathematics Background

M.Sc. in Mathematics — applied to real engineering problems:

  • Probability & statistics for ML model design and evaluation
  • Linear algebra & optimisation for algorithm development
  • Mathematical modelling for simulation, prediction, and data-driven systems
  • Algorithm design and complexity analysis for performance-critical software

🚀 What I build

  • AI SaaS products — full-stack apps with LLM features, streaming, auth, and billing
  • AI agents & chatbots — ChatGPT API, function calling, MCP tool servers
  • Mobile apps — cross-platform iOS & Android with React Native
  • Data pipelines — ETL, RAG systems, vector search with PostgreSQL pgvector
  • APIs & microservices — scalable Node.js / Python backends with CI/CD
  • Browser & desktop extensions — Chrome extensions, desktop applications
  • Payment integrations — Stripe and payment gateway integration

📊 GitHub Stats

GitHub stats   Top languages


📫 Let's work together

I'm available for freelance projects — AI integrations, full-stack builds, mobile apps, and mathematical modelling.

kroy.dev  ·  Hire me on Upwork  ·  Connect on LinkedIn

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