Available for Opportunities

Hi, I'm Bablu Kumar 👋Full Stack Engineer

I build robust, scalable applications and am currently learning and upgrading my skills in AI Engineering.

Current ProjectBuilding a Next.js AI SaaS Application

View ProjectsView Resume

Core Technical Stack

Java
Spring Boot
Hibernate
Microservices
RESTful APIs
PostgreSQL
Supabase
Apache Kafka
Redis
React
Next.js
Tailwind CSS
Framer Motion
Agentic Workflows
RAG Pipelines
LangChain
OpenRouter
Hugging Face
Ollama
n8n
Cursor IDE
Java
Spring Boot
Hibernate
Microservices
RESTful APIs
PostgreSQL
Supabase
Apache Kafka
Redis
React
Next.js
Tailwind CSS
Framer Motion
Agentic Workflows
RAG Pipelines
LangChain
OpenRouter
Hugging Face
Ollama
n8n
Cursor IDE

Technical Skills

A comprehensive toolkit spanning full-stack development and AI orchestration.

Backend & Architecture

JavaSpring BootHibernateMicroservicesRESTful APIsNode.jsExpress

AI Engineering & LLMs

Agentic WorkflowsRAG PipelinesLangChainOpenRouterHugging FaceChromaDB

Database & Cloud

PostgreSQLMongoDBRedisApache KafkaSupabaseJWT Authentication

Frontend & UI

ReactNext.jsTailwind CSSFramer MotionTypeScriptJavaScript

Experience & Agency

Building tech ecosystems and leading AI automation.

Founding Engineer (Full Stack & AI)

Rent Eco•May 2026 - Present
  • Architected a 'Zero-UI' agentic commerce system where a central AI assistant handles end-to-end user operations and complex inventory rentals.
  • Engineered a decoupled hybrid microservices ecosystem using Node.js/Express for high-speed CRUD alongside a Python/FastAPI service for heavy AI orchestration.
  • Developed an advanced RAG pipeline utilizing ChromaDB and LLM function calling to translate vague user queries into automated database transactions.
  • Solved critical e-commerce race conditions and 'double-booking' issues by implementing Redis distributed locks and database-level transaction safety.
  • Leading the MVP backend roadmap, establishing stateless JWT authentication, robust multi-tenant data structures, and automated KYC API integrations.

Strategy & Growth Partner / AI-First Full Stack Developer

Coding Age•Remote, Part-time
  • Serving as the AI Curriculum & Vibe Coding Architect.
  • Pivoted the institute's curriculum to include modern stacks (v0.dev, CodiumAI, Agentic AI, GitHub, LinkedIn branding).
  • Driving high-level technical strategy, faculty training, and collaborative product-based ecosystems.

Featured Projects

A selection of my architectural builds, from scalable high-concurrency systems to autonomous AI agents.

RideFlow Management System

A highly scalable transportation/ride backend focusing on real-time location tracking and geospatial queries.

Spring BootKafkaRedis

UPI Lite Payment Engine

Architected a robust backend logic system focusing on atomic transactions and ACID compliance for money transfers.

JavaSpring BootPostgreSQLKafka

Blooms Blog Management System

A Core Java project evolving into an API-driven platform. Features include blog creation, categories, user roles, comments, and search.

Core JavaOOPJDBC

Mini Amazon Backend

A robust E-Commerce Backend API built with Java 17, Spring Boot 3, and MongoDB. Follows strict 3-Layer Architecture.

Java 17Spring Boot 3MongoDB

Movie-Zone

A modern, responsive web application showcasing clean UI design, reusable components, and optimized performance.

ReactJavaScriptHTMLCSS

Digital Twin AI Portfolio

A RAG-based personal web application that allows recruiters to chat with an AI clone.

Next.jsReactLangChain

BiharRozgar.in AI Integration

Implemented a sophisticated AI chatbot driven by a custom RAG system to assist users dynamically with employment opportunities.

PythonRAGNext.jsLangChain