Available for new projects

AI & Full Stack Developer Building Production-Grade Software for Startups

I'm Niraj Kumar— Full Stack AI Developer building Web & Mobile SaaS and End-to-End Business Automation. From architecture to deployment, I deliver complete systems that handle real users and real data.

Need a developer who can turn an idea into shipped software? Let's talk.

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AI systems

How I Build Production AI

From raw company data to grounded, evaluated answers — the same pipeline behind the chatbots, agents and automations I ship.

Data sources

Docs, databases, APIs and inboxes your team already uses.

PDF · Notion · SQL

Ingest & chunk

Clean, split and enrich content so retrieval stays precise.

parsers · OCR

Embed

Turn every chunk into vectors with the right model for the job.

OpenAI · local

Vector store

Hybrid search with metadata filters and fast reranking.

pgvector · Pinecone

Agent + tools

LLM reasons, calls your tools and cites its sources.

LangGraph · Claude

Answer + evals

Streamed answers, guardrails, and evals that catch regressions.

evals · tracing

Turn Your Idea Into a Scalable Product

I help businesses build modern web, mobile, and AI applications that grow with their users and goals — delivering end-to-end engineering solutions from architecture to deployment, focused on solving real business problems, not just writing code.

AI & Machine Learning

AI Chatbots & Intelligent Assistants

Custom AI solutions that understand and respond to user needs. We build conversational AI systems using LangChain, OpenAI, and Anthropic Claude that access your business data, answer questions, and automate support workflows. Solutions include RAG (Retrieval Augmented Generation) for document understanding and can be deployed on your infrastructure for complete data privacy.

Deliverables

LangChain / LangGraph pipeline
OpenAI / Claude integration
RAG knowledge base
Document processing
Conversation analytics
Secure deployment

Best for: Customer support automation, internal knowledge systems

Full Stack Development

Web Application Development

Complete web application solutions built with modern technologies. We create scalable SaaS platforms, business portals, and customer-facing applications using React, Next.js, TypeScript, and Redux. Our solutions include user authentication (Auth0, Firebase), subscription management (Stripe, Paddle), role-based permissions, and secure data handling for businesses of all sizes.

Deliverables

Next.js & React architecture
Auth0 / Firebase authentication
Stripe / Paddle integration
Admin dashboards
REST / GraphQL APIs
PostgreSQL / MongoDB

Best for: Startups, growing businesses, enterprise teams

Cloud & Infrastructure

Cloud Infrastructure Setup

Professional cloud infrastructure on AWS, Google Cloud, or Azure. We implement Docker containerization, Kubernetes orchestration (EKS, GKE, AKS), automated CI/CD pipelines (GitHub Actions, GitLab CI), and infrastructure-as-code with Terraform. Built for reliability, security, and compliance requirements.

Deliverables

AWS / GCP / Azure setup
Kubernetes (EKS/GKE/AKS)
Terraform infrastructure
GitHub Actions CI/CD
Auto-scaling & load balancing
Disaster recovery

Best for: Production applications, scalable systems, regulated industries

Specialized Stacks

Looking for a specific stack?

Dedicated guides for the work I do most often — pick the stack closest to your project.

View All Services →

The stack

Models, Agents & the Infra to Ship Them

Models

OpenAI
Claude
Ollama
vLLM

Agents & orchestration

LangChain
LangGraph
n8n
Tool calling

Vector & data

pgvector
Pinecone
Postgres
Prisma

Ship & scale

Next.js
FastAPI
Docker
AWS
Vercel
GitHub Actions

Products & Tools I've Shipped

Live SaaS apps and AI tools I built and deployed end-to-end. Each one has its own terms — open it to see what applies.

Instant Play + Leaderboards

GameHub 3D

Browser-native 3D games that start in one click — drift a canyon, stack a tower, race a ghost. No download, no signup, no launcher.

Open tool

Design + Export

Bulk QR Code Generator

Paste a list of URLs or import a CSV and instantly generate QR codes in bulk — customize colors, add a logo, and download all as a ZIP.

Open tool

Simple & Fast

MD to PDF

Convert Markdown to a professional PDF document with formatting and styling options.

Open tool

View All Products & Tools →

Why Work With Me

Business-first mindset

I build solutions around your goals and ROI, not just the tech.

AI + Full Stack

Rare combination — I can architect, build, and deploy end-to-end AI systems.

Production experience

I've shipped real systems that handle real users and real data.

Clean, scalable code

Well-structured, documented, and maintainable.

Practical Insights for Building Better Products

Actionable guides on shipping faster, scaling smarter, and solving real business challenges — written for founders and teams who value results over hype.

Read the Blog →

Frequently Asked Questions

Everything founders and product teams ask before hiring me.

How long does it take to build a RAG chatbot?

A standard RAG chatbot — ingestion pipeline, vector store (pgvector or Pinecone), retrieval, citations, and a chat UI — takes 2–3 weeks. Adding agent loops, evaluation harnesses, or fine-tuning extends the timeline.

What tech stack do you use?

Frontend: Next.js (App Router), React, TypeScript, Tailwind. Backend: Node.js, Python (FastAPI). AI: LangChain, LangGraph, OpenAI, Anthropic Claude, Ollama, pgvector, Pinecone. Infra: Docker, AWS, Vercel, GitHub Actions. Automation: n8n.

Do you work with startups or enterprises?

Both. I've shipped production systems for early-stage startups (auth, billing, AI features) and worked inside enterprise teams. Most engagements are remote and async-first.

Do you sign NDAs and handle data privacy?

Yes. I sign NDAs before any technical discussion involving proprietary data, and I support self-hosted deployments (Ollama, vLLM) for clients who can't send data to third-party LLM APIs.

Let's Build Something Great

Have an idea, project, or business problem? Let's discuss how I can help you build it.

Contact Me View Services