Product engineering, AI agent integrations, and technical writing for early-stage startups and SaaS teams.

I build web apps and MCP-connected agents, then write the docs, tutorials, and demos a developer can follow. Open to freelance contracts.

Portfolio · Case studies · DevRel · Writing · LinkedIn · X · Resume · Email

Product engineering for SaaS web apps. Next.js and TypeScript interfaces, FastAPI or tRPC APIs, PostgreSQL, and deployment on Vercel, AWS, or Cloudflare.

AI agent and MCP integrations. Tool use, memory checks, and approval gates. MCP and WebMCP surfaces, local models through Ollama, and OpenTelemetry when a workflow needs traces.

Technical writing, docs, and DevRel content. API documentation, sample apps, tutorials, and posts aimed at developers who will try the product.

FormOS — Full-stack form builder: create a form, publish it, share a link and QR code, and read views, submissions, and per-field analytics. Next.js, tRPC, Drizzle, and PostgreSQL.
Demo · Code

₹800 — Heat-aware day planner that schedules jobs, travel, and rest with OR-Tools on AWS Lambda, and reports the income target it cannot meet inside the heat rules. Next.js, FastAPI, English and Hindi.
Demo video · Code

reviewcheap — Pull-request review tool that measures the diff, checks it against the repository's contributing guidelines, and returns a review you can paste as a comment.
Code

OmniDev — Native macOS assistant for cited file and screenshot search, code edits, and tests, with scoped tools and approval prompts. SwiftUI, FastAPI, SQLite, Ollama, and MCP. Local inference, with an optional cloud provider.
Demo · Code · Case study · Recordings · Architecture

ContextFirewall — MCP memory checker that holds back stale facts, contradictions, secrets, and unsupported claims before they are packed into an agent's context.
Demo · Code · Case study

Graft — Turns semantic HTML into reviewed WebMCP contracts: inspect the evidence, export an adapter, and verify the tools that shipped.
Workbench · Code · Case study

VOX — Voice-to-plan support workflow with explicit approvals, persisted results, and a spoken briefing. Mastra, Temporal, Gemma, and ElevenLabs. The judge demo uses fictional tickets and simulated customer sends.
Demo · Code · Case study

otel-swarm — OpenTelemetry for multi-agent LLM workflows: spans for agents and model calls, fallback and review events, and SigNoz dashboards.
Code · Write-up

Pixel Digit Recognizer — Handwritten digits recognized in the browser. Pyodide runs the NumPy network on the page.
Demo · Code

39 posts on DEV, with 627 reactions.

• EmbodiWeave: my agent read its own failure and repeated it — graph-enforced memory, recorded decisions, and fixed promotion gates in a robot simulation.
• ToolTrap: my support agent handed a customer a fake phone number — untrusted tool results, held-out cases, and corrections to the scorer.
• We instrumented an AI agent swarm with SigNoz — what the telemetry changed about routing, model budgets, and review quality.
• A trust firewall for my AI agent's memory — Cognee's memory lifecycle, provenance, and the failures around recall.
• The smolagents bug that retried valid code three times — a reproducible debugging story, recognized as a DEV Summer Bug Smash runner-up.
• Suniye: let my parents hear the message themselves — a Hindi reading aid that speaks shared text, images, and PDFs, including where OCR and speech stay bounded.

TypeScript, JavaScript, Python, Next.js, FastAPI, tRPC, Drizzle, PostgreSQL, SQLite, Convex, SwiftUI for macOS, Cloudflare Workers, Vercel, AWS, MCP, WebMCP, Ollama, LangChain, RAG, Mastra, OpenTelemetry, Playwright.

• Merged pull requests to Kestra.
• Flatpack placed 2nd in the Agent Builder track at the Livepeer Agent Hackathon 2026. It turns a narrated how-to video into printable illustrated instructions.
• AMD DevMaster 2026 Excellent Award, listed under team himanshu748.

Open to freelance contracts with early-stage startups, SaaS companies, and developer-tool teams: a web app that needs to ship, an agent or MCP integration, or docs and DevRel content around a product you already have.

jhahimanshu653@gmail.com · LinkedIn · X · Resume

GitHub Sponsors supports more open-source tools and practical guides. Thank you to Cap, my first GitHub sponsor.