Production AI Systems
RAG pipelines (LangChain, LangGraph), vector search (pgvector, Pinecone), evaluation harnesses, observability with LangSmith / Langfuse, and self-hosted deploys (Ollama, vLLM) for privacy-sensitive workloads.
About
I'm Niraj Kumar.
I build production AI and full stack systems for startups and product teams — RAG chatbots, LangChain agent workflows, Next.js apps, and n8n automation pipelines that handle real users and real data.
I've shipped end-to-end systems for early-stage startups (auth, billing, AI features) and worked inside enterprise teams (Consltek, Inc.). Most engagements are remote, async-first, and scoped to clear business outcomes — not stack experiments.
What I Specialize In
Four areas where I do my deepest work. Each links to a dedicated services page with delivery details.
Full Stack Engineering
Next.js 15/16 App Router with TypeScript and Server Components, Node.js APIs, PostgreSQL, Stripe / Cashfree billing, OAuth, and Vercel / AWS / Docker deployments.
Automation & Workflows
Self-hosted n8n workflows for lead capture, CRM sync, ETL pipelines, AI agents, and ops automation — with retries, monitoring, and clear documentation.
Cloud & DevOps
Docker, Kubernetes, GitHub Actions CI/CD, Nginx reverse proxies, observability with Prometheus and Grafana, zero-downtime deploys on AWS and Vercel.
How I Work
Principles I bring to every engagement.
01
Business outcomes first
I optimize for shipped value, not stack novelty. Every architecture decision is tied to a real constraint — cost, latency, compliance, or team velocity.
02
Production from day one
Tests, logs, error boundaries, and observability are scoped into v1 — not bolted on after launch.
03
Async-first, remote-friendly
Clear written specs, recorded loom walkthroughs, and weekly demos. I work across time zones without standup overhead.
04
No vendor lock-in by default
I default to open standards (OpenAI/Anthropic SDK compatible, pgvector over proprietary stores) so you can switch providers without a rewrite.
Where to Find Me
Open source work, professional history, and shipped products.
Have a project in mind?
I reply within 24 hours. Free consultation, NDA-friendly, remote-first.