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© 2026 Sayan Dey . All rights reserved.

Full-Stack Developer • AI & Systems

Sayan Dey
Building scalable systems & AI applications

I build real-world applications using MERN, Next.js, and modern AI tools — focusing on backend systems, agent-based workflows, and real-time features.

🚀 View Projects✍️ Read Blogs🤝 Connect With Me
Sayan Dey
🚀 View Projects✍️ Read Blogs🤝 Connect With Me

Proof of Work

Demonstrating practical experience in building scalable, intelligent and production-grade systems.

Full-Stack Systems

Building scalable applications using Next.js, Node.js and modern databases.

AI Engineering

Developing AI agents, LLM tools and intelligent automation systems.

Real-Time Applications

Experience with WebSockets, Redis and live communication systems.

DevOps & Infrastructure

Dockerized deployments, Linux environments and scalable backend setup.

Full-Stack Systems

Building scalable applications using Next.js, Node.js and modern databases.

AI Engineering

Developing AI agents, LLM tools and intelligent automation systems.

Real-Time Applications

Experience with WebSockets, Redis and live communication systems.

DevOps & Infrastructure

Dockerized deployments, Linux environments and scalable backend setup.



Tech Stack

Technologies and tools I use to design , build and scale modern applications.

Languages

JavaScriptTypeScriptPythonJavaC

Frontend

Next.jsReactTailwind CSSShadcn/UIHTMLCSS

Backend

Node.jsExpressMongoDBPostgreSQLRedisREST APIsJWT Auth

AI / ML

LangChainLangGraphRAGAI AgentsPrompt EngineeringGemini APIGroq APIOpenAI-style API Design

DevOps & Tools

DockerLinuxNginxGitVercel


Let’s Connect 👋

Whether you have an idea, an opportunity, or just want to network and chat — drop your email and let’s connect.

Featured Projects

Selected projects demonstrating real-world engineering and product development.

Mini RAG
aicompleted
Mini RAG
A modular, production-style Retrieval-Augmented Generation (RAG) system built from scratch with FastAPI, Qdrant, HuggingFace, Groq, RQ, and Docker. Features asynchronous document indexing, custom vector retrieval, streaming responses, session memory, and an extensible provider architecture.
pythonragfastapiaidockerqdranthuggingfacevectorbackendgroqdatabasesemantic-search
GitHub
Sayan Builds
fullstackcompleted
Sayan Builds
A modern developer platform featuring a portfolio, technical blog, AI Lab, and a custom-built content management system, designed with performance, scalability, and developer experience in mind.
nextjsreacttypescriptmongodbtailwindcssdeveloper-portfoliotechnical-blogsblogsprojectscontent-management-systemcmsmarkdowncloudinaryai-labseofullstackweb-development
Live Demo
Mini RAG
aicompleted
Mini RAG
A modular, production-style Retrieval-Augmented Generation (RAG) system built from scratch with FastAPI, Qdrant, HuggingFace, Groq, RQ, and Docker. Features asynchronous document indexing, custom vector retrieval, streaming responses, session memory, and an extensible provider architecture.
pythonragfastapiaidockerqdranthuggingfacevectorbackendgroqdatabasesemantic-search
GitHub
Sayan Builds
fullstackcompleted
Sayan Builds
A modern developer platform featuring a portfolio, technical blog, AI Lab, and a custom-built content management system, designed with performance, scalability, and developer experience in mind.
nextjsreacttypescriptmongodbtailwindcssdeveloper-portfoliotechnical-blogsblogsprojectscontent-management-systemcmsmarkdowncloudinaryai-labseofullstackweb-development
Live Demo
View All Projects


AI Lab

Experimental AI systems, intelligent agents and ongoing research explorations.

Mini Agent
agentbuilding
Mini Agent
A modular AI agent framework built with a TypeScript monorepo and a Python AI runtime. Designed for provider abstraction, streaming, tool calling, and extensibility, making it easy to integrate new models, tools, and agent capabilities.
ai-agentllmtypescriptpythonmonorepotool-callingcli
GitHub
Mini RAG
toolcompleted
Mini RAG
A modular Retrieval-Augmented Generation (RAG) system built from scratch to explore document indexing, semantic retrieval, prompt engineering, streaming responses, and production-ready AI architectures.
llmvector-databasesemantic-searchembeddingsprompt-engineeringai-engineeringstreamingknowledge-retrievaldockerize
GitHub
Mini Agent
agentbuilding
Mini Agent
A modular AI agent framework built with a TypeScript monorepo and a Python AI runtime. Designed for provider abstraction, streaming, tool calling, and extensibility, making it easy to integrate new models, tools, and agent capabilities.
ai-agentllmtypescriptpythonmonorepotool-callingcli
GitHub
Mini RAG
toolcompleted
Mini RAG
A modular Retrieval-Augmented Generation (RAG) system built from scratch to explore document indexing, semantic retrieval, prompt engineering, streaming responses, and production-ready AI architectures.
llmvector-databasesemantic-searchembeddingsprompt-engineeringai-engineeringstreamingknowledge-retrievaldockerize
GitHub
Explore AI Lab


Latest Blogs

Fresh posts about full-stack development, AI/ML experiments, and what I’m learning.

= vs == vs === Explained: JavaScript, TypeScript, Python & Java

Jul 23, 2026 • 6 min read

= vs == vs === Explained: JavaScript, TypeScript, Python & Java
Learn the difference between =, ==, and ===, understand type coercion, reference equality, and see how variables are stored in stack and heap memory with simple diagrams.
HTTP QUERY: The New HTTP Method That Solves a 16-Year-Old Problem

Jul 20, 2026 • 5 min read

HTTP QUERY: The New HTTP Method That Solves a 16-Year-Old Problem
In June 2026, the HTTP QUERY method became an official standard, solving a long-standing problem in REST APIs. Learn why developers relied on POST for complex searches, how QUERY fixes it, and how to implement it in Express, FastAPI, and JavaScript.
How to Build a Chat App with WebSockets (Demo)

Mar 14, 2026 • 1 min read

How to Build a Chat App with WebSockets (Demo)
Real-time messaging made easy using WebSockets, Node.js, and a simple frontend UI. Build your own chat app today!
= vs == vs === Explained: JavaScript, TypeScript, Python & Java

Jul 23, 2026 • 6 min read

= vs == vs === Explained: JavaScript, TypeScript, Python & Java
Learn the difference between =, ==, and ===, understand type coercion, reference equality, and see how variables are stored in stack and heap memory with simple diagrams.
HTTP QUERY: The New HTTP Method That Solves a 16-Year-Old Problem

Jul 20, 2026 • 5 min read

HTTP QUERY: The New HTTP Method That Solves a 16-Year-Old Problem
In June 2026, the HTTP QUERY method became an official standard, solving a long-standing problem in REST APIs. Learn why developers relied on POST for complex searches, how QUERY fixes it, and how to implement it in Express, FastAPI, and JavaScript.
How to Build a Chat App with WebSockets (Demo)
Read All Blogs


Mar 14, 2026 • 1 min read

How to Build a Chat App with WebSockets (Demo)
Real-time messaging made easy using WebSockets, Node.js, and a simple frontend UI. Build your own chat app today!