---
title: "Arpit Khandelwal — Fractional AI & Backend Engineer"
description: "Fixed-scope AI and backend build sprints: services, shipped work, terms, and contact."
canonical: https://www.arpitkhandelwal.com/
---
# Arpit Khandelwal

Fractional AI & backend engineer for build sprints.

Based in Bengaluru, India. 1 sprint slot open for July. Replies within 24 hours.

## What I do

- **AI agents and automation** — MCP servers, RAG, browser automation, tool use, and messy workflow execution.
- **Backend systems and APIs** — Auth, dashboards, ingestion, API orchestration, Postgres/MongoDB, and production glue.
- **Privacy and crypto infra** — Solana, Arcium, ZK, Helius, vaults, micropayments, and privacy experiments.

## How a sprint runs

1. **Scope the path** (Week 0) — Turn the fuzzy ask into interfaces, risks, and a sprint target.
2. **Build the core** (Weeks 1-4) — Ship APIs, agents, integrations, data stores, and product surfaces.
3. **Demo every week** (Cadence) — Working demos, tradeoff notes, and clear next moves.
4. **Handoff cleanly** (Close) — Merged PRs, setup notes, operating context, and next steps.

## Selected work

### Reskilll Platform — Product backend (2025 - 2026, shipped)

**Problem.** Event/community software needed auth, profiles, judging, dashboards, and submissions.

**Shipped.** OTP login, Google OAuth, profile APIs, dashboards, CMS console, judging, and submissions.

**Stack.** Next.js, Express, MongoDB, Auth

**Proof.** Owned auth and profile surfaces; Built operational dashboard flows; Moved across frontend, backend, and CMS logic

Link: https://reskilll.com

### Swiggy MCP Server — AI automation (2025, shipped)

**Problem.** An AI concierge needed to operate inside a closed consumer surface.

**Shipped.** A Playwright-backed MCP server for controlled browser-session operation.

**Stack.** MCP, Playwright, LLMs, Backend

**Proof.** Tool layer for an AI concierge; Browser-session automation; Backend control surface around a third-party UI

Link: https://avici.money

### Gossip DAO — Product launch (2025, shipped)

**Problem.** A residency community needed a fast anonymous social product people would use.

**Shipped.** A privacy-focused community app that hit 50+ users and 200+ posts within 24 hours.

**Stack.** Next.js, Solana, Prisma, TypeScript

**Proof.** Fast product launch; Privacy-focused social flow; Immediate community usage

Link: https://gossip-dao.vercel.app

### Helius Indexer — Data infra (2024, shipped)

**Problem.** Solana teams needed queryable chain activity without custom webhook plumbing.

**Shipped.** A webhook-to-Postgres indexer for faster on-chain event inspection.

**Stack.** Solana, Helius, Postgres, Node.js

**Proof.** Webhook ingestion; SQL query layer; Chain data made product-readable

Link: https://helius-indexer.arpitkhandelwal.com

### Dark Payroll — Privacy infra (2026, shipped)

**Problem.** Payroll products need salary privacy without losing compliance proof.

**Shipped.** A Solana payroll app with hidden salary data and ZK compliance proofs, with a live demo.

**Stack.** Solana, ZK proofs, Privacy, TypeScript

**Proof.** Privacy-preserving payroll; Compliance proof framing; Solana Privacy Hackathon 2026 build

Link: https://github.com/Arpit-Khandelwal/dark-payroll

### Arcium Privacy Suite — Confidential compute (2025 - 2026, experiment)

**Problem.** On-chain apps leak their inputs; most teams cannot compute on encrypted data.

**Shipped.** Five Arcium confidential-compute apps: private voting, a sealed tip jar, an encrypted message board, a secure lottery, and an encrypted calculator.

**Stack.** Arcium, Rust, Solana, MPC

**Proof.** Hands-on MPC / encrypted compute; Reusable privacy primitives; Backs the privacy-infra positioning

Link: https://github.com/Arpit-Khandelwal?tab=repositories

### AgentPay — Agent protocol (2026, experiment)

**Problem.** Autonomous agents need payment rails for streamed machine-to-machine services.

**Shipped.** A Solana streaming micropayment protocol exploration for agent services (hackathon build).

**Stack.** Solana, Agents, Payments, TypeScript

**Proof.** Payment model for agent services; Streaming settlement direction; Protocol-shaped product thinking

Link: https://github.com/Arpit-Khandelwal/agentpay

### sold. — Privacy demo (2026, experiment)

**Problem.** Ad-tech profiles and prices you from browser signals before you ever consent.

**Shipped.** A page that reads the signals your browser leaks on arrival, sends them to an LLM that profiles and prices you, then confesses exactly what it did and stores nothing.

**Stack.** LLMs, OpenRouter, Fingerprinting, Next.js

**Proof.** Live browser-signal profiling; LLM persona and price generation; Zero-storage, full-disclosure design

Link: https://sold.arpitkhandelwal.com

### x402 Web Services — Agent payments (2026, experiment)

**Problem.** Agents and APIs need pay-per-use access without subscriptions or accounts.

**Shipped.** A live pay-as-you-go app on the x402 protocol: per-message AI chat and a pay-once URL shortener, settled with micropayments.

**Stack.** x402, Solana, Payments, Next.js

**Proof.** HTTP-402 paywall integration; Per-call micropayment settlement; Reinforces the AgentPay direction

Link: https://x402.arpitkhandelwal.com

## Project archive

- **XOXO** — Every tic-tac-toe game (all 255,168) as a branching, censused game tree with a minimax oracle. (https://xoxo.arpitkhandelwal.com)
- **Atlas** — AI chatbot for the Solana ecosystem with RAG-backed answers. (https://solchat.arpitkhandelwal.com)
- **Sage Aadit** — AI therapist with weekly check-ins over indexed journal entries. (https://sage-aadit.arpitkhandelwal.com)
- **Ion** — Solana voting dApp plus a native-SOL deposit/withdraw vault. (https://ion.arpitkhandelwal.com)
- **WhatsApp Automation** — AI-assisted property and messaging workflows over WhatsApp. (https://github.com/Arpit-Khandelwal/whatsapp-api)
- **Video Trimmer** — Frame-accurate trim and merge across mixed resolutions. (https://video-trimmer.arpitkhandelwal.com)
- **100xNFT** — Gated Solana NFT minting for the 100x Devs cohort. (https://nft.arpitkhandelwal.com)
- **GitHub Leaderboard** — Open-source contribution ranking via the GitHub API. (https://leaderboard.arpitkhandelwal.com)
- **Blinks** — Solana Actions for betting, gated NFTs, and quizzes. (https://actions.arpitkhandelwal.com/api/actions)
- **YouTube Downloader** — FFmpeg pipeline for audio and video exports. (https://yt.arpitkhandelwal.com)
- **Poop Tracker (MicrobiomeDAO)** — Microbiome tracking app shipped for an external DAO. (https://github.com/MicrobiomeDAO/poop-tracker)
- **CPP Practice** — 494-commit competitive-programming archive. (https://github.com/Arpit-Khandelwal/CPP-Practice)

## Experience

- **Software Developer, Freelance** (2021 - Present) — Automation pipelines, social bots, scrapers, creator tooling, LLM workflows, and crypto experiments.
- **AI and Backend Engineer, Avici Money** (Jan 2025 - Jul 2025) — AI concierge infrastructure for ordering, booking, and task execution.
- **Software Developer 1, Hewlett Packard Enterprise** (2023 - 2024) — Microservice integrations for WebInspect, Burp Suite, OWASP ZAP, and OpenVAS.

## Stack

TypeScript, Next.js, Node.js, Python, LLMs, MCP, Playwright, Postgres, Hono, Docker, Kubernetes, AWS, Cloudflare Workers, Solana, Arcium, ZK proofs, Rust, Prisma, FFmpeg, Web scraping.

## Engagement

- **Model** — Fixed-scope sprints, 2-6 weeks.
- **Pricing** — Flat per-sprint, tied to a shipped outcome. No hourly billing.
- **Start** — Scoping call within 48h; the sprint begins once scope is signed off.
- **Reply** — Within 24 hours, always.

What you get:

- Merged, production-path code, not slideware.
- Weekly working demos and tradeoff notes.
- Auth, data, and logging done properly.
- Handoff docs so your team can keep shipping.

## Fit

Good fits:

- AI tools, browsers, memory, retrieval, or automation.
- Backend/API prototypes that need a production path.
- Auth, data, dashboards, payments, agents, or infra glue.

Not a fit:

- Pure landing-page polish.
- Vague ideas without scope, users, or decisions.
- Meeting-heavy discovery with little shipped code.

## FAQ

### How does pricing work?

Sprints are fixed-scope, fixed-window engagements (2-6 weeks). After a short scoping call I send a flat sprint price tied to a clear shipped outcome, no hourly billing. Send the goal, stack, and deadline and I will quote the smallest useful slice.

### What do you actually ship?

Working, merged code: APIs, AI agents and MCP servers, browser automations, dashboards, and data pipelines, plus weekly demos and handoff notes so your team can keep going.

### Can you join an existing codebase?

Yes. Most sprints are about finishing the awkward middle: a broken integration, a demo that needs a production path, or an agent that has to survive real users.

### What is the fastest way to start?

Use the sprint configurator to generate a brief, then send it. I reply within 24 hours with whether it is a fit and the smallest shippable scope.

### Full-time or sprints only?

Primarily fractional build sprints, but open to fractional-to-full-time conversations for AI and backend roles.

## Contact

Email: ak@arpitkhandelwal.com. Replies within 24 hours.

Machine-readable API: https://www.arpitkhandelwal.com/openapi.json · Docs: https://www.arpitkhandelwal.com/docs