AI agents and automation
MCP servers, RAG, browser automation, tool use, and messy workflow execution.
For founder-led build sprints
Arpit Khandelwal
Fractional AI & backend engineerfor build sprints.
Ship the AI/backend piece without hiring a full team.
Scoped APIs, agents, automations, dashboards, and handoff docs in 2-6 week sprints.
1 sprint slot open for July · Replies within 24 hours
Fast scope
Weekly demos
Production path
Best fit
Ambiguous AI/backend work that needs to ship
What I build
Senior execution for the awkward middle.
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.
Good fit / bad fit
A stronger yes by making the no obvious.
Good fit
AI tools, browsers, memory, retrieval, or automation.
Backend/API prototypes that need a production path.
Auth, data, dashboards, payments, agents, or infra glue.
Bad fit
Pure landing-page polish.
Vague ideas without scope, users, or decisions.
Meeting-heavy discovery with little shipped code.
Sprint configurator
Turn the ask into a brief.
Choose the sprint shape. It pre-fills the contact form below, so sending takes one step.
Work type
Timeline
Current state
Sprint brief
I'd like to start a build sprint. Goal: a founder-led AI/backend sprint Work type: AI agent Timeline: 4 weeks Current state: Prototype exists What's stuck / context:
Build sprint
A short loop around a shipped outcome.
Built for teams that know the product direction and need the risky AI/backend piece shipped.
Week 0
Scope the path
Turn the fuzzy ask into interfaces, risks, and a sprint target.
Weeks 1-4
Build the core
Ship APIs, agents, integrations, data stores, and product surfaces.
Cadence
Demo every week
Working demos, tradeoff notes, and clear next moves.
Close
Handoff cleanly
Merged PRs, setup notes, operating context, and next steps.
Track record
Outcomes before adjectives.
2-6
week build sprints
A fuzzy ask or broken integration turned into a demoable, merged system.
200+
posts, day one
Gossip DAO launch: a privacy-first community app with 50+ users in 24 hours.
5+
years shipping
AI agents, backend APIs, automation, and crypto infra since 2021.
10+
case-grade builds
From the Reskilll platform to Dark Payroll, Helius indexing, and the Arcium privacy suite.
Where I have shipped
Hewlett Packard EnterpriseAvici MoneyReskilll
Case studies
Shipped work, then experiments.
View a case for the deeper proof, or open the live project.
Shipped
01
Product backend / 2025 - 2026
Reskilll Platform
Live platform: auth, CMS, judging, dashboards
Shipped: OTP login, Google OAuth, profile APIs, dashboards, CMS console, judging, and submissions.
Next.jsExpressMongoDBAuth
02
AI automation / 2025
Swiggy MCP Server
AI concierge ran on a closed consumer app
Shipped: A Playwright-backed MCP server for controlled browser-session operation.
MCPPlaywrightLLMsBackend
03
Product launch / 2025
Gossip DAO
50+ users, 200+ posts in 24h
Shipped: A privacy-focused community app that hit 50+ users and 200+ posts within 24 hours.
Next.jsSolanaPrismaTypeScript
04
Data infra / 2024
Helius Indexer
Chain events to queryable Postgres, live
Shipped: A webhook-to-Postgres indexer for faster on-chain event inspection.
SolanaHeliusPostgresNode.js
05
Privacy infra / 2026
Dark Payroll
Live demo: ZK payroll + compliance proofs
Shipped: A Solana payroll app with hidden salary data and ZK compliance proofs, with a live demo.
SolanaZK proofsPrivacyTypeScript
Experiments & labs
06
Confidential compute / 2025 - 2026
Arcium Privacy Suite
5 confidential-compute apps on Arcium
Shipped: Five Arcium confidential-compute apps: private voting, a sealed tip jar, an encrypted message board, a secure lottery, and an encrypted calculator.
ArciumRustSolanaMPC
07
Agent protocol / 2026
AgentPay
Agent payment protocol (hackathon)
Shipped: A Solana streaming micropayment protocol exploration for agent services (hackathon build).
SolanaAgentsPaymentsTypeScript
08
Privacy demo / 2026
sold.
Priced-on-arrival privacy provocation
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.
LLMsOpenRouterFingerprintingNext.js
09
Agent payments / 2026
x402 Web Services
Live pay-per-use services on x402
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.
x402SolanaPaymentsNext.js
Architecture map
Where I plug into the stack.
Selected layer
LLM
Tool contracts, memory, retrieval, and product constraints around the model.
Swiggy MCP ServerMouse Cursor AI
FAQ
Straight answers.
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.
Engagement
What you get, and how it starts.
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.
How it works
- 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.
Proof timeline
The through-line.
HPE
Enterprise security tooling and microservice integrations around DAST surfaces.
Avici
AI concierge infrastructure for ordering, booking, and task execution.
Reskilll
Auth, profiles, CMS, judging, submissions, and dashboards.
Public labs
Agent payments, private payroll, encrypted games, indexing, and automation.
Now
AI/backend build sprints for teams that need senior execution.
Lead magnet
AI backend sprint checklist.
01
Name the user-facing outcome.
02
List external systems.
03
Demo the riskiest workflow first.
04
Define auth, data, and logs.
05
Ship weekly PRs, demos, and notes.
Experience
From enterprise security to agentic product work.
Freelance
2021 - Present
Software Developer
Automation pipelines, social bots, scrapers, creator tooling, LLM workflows, and crypto experiments.
Avici Money
Jan 2025 - Jul 2025
AI and Backend Engineer
AI concierge infrastructure for ordering, booking, and task execution.
Hewlett Packard Enterprise
2023 - 2024
Software Developer 1
Microservice integrations for WebInspect, Burp Suite, OWASP ZAP, and OpenVAS.
Toolbox
Fast across agents, APIs, and infra.
TypeScript
Product code
Next.js
App framework
Node.js
Backend runtime
Python
Automation
LLMs
Agent brains
MCP
Tool protocol
Playwright
Browser ops
Postgres
Data layer
Hono
API layer
Docker
Shipping
Kubernetes
Infra
AWS
Cloud
Cloudflare Workers
Edge runtime
Solana
Onchain apps
Arcium
Encrypted compute
ZK proofs
Privacy layer
Rust
Programs
Prisma
ORM
FFmpeg
Media pipeline
Web scraping
No-API work
Archive
Smaller builds, sharp edges, useful reps.
XOXO
Every tic-tac-toe game (all 255,168) as a branching, censused game tree with a minimax oracle.
Atlas
AI chatbot for the Solana ecosystem with RAG-backed answers.
Sage Aadit
AI therapist with weekly check-ins over indexed journal entries.
Ion
Solana voting dApp plus a native-SOL deposit/withdraw vault.
WhatsApp Automation
AI-assisted property and messaging workflows over WhatsApp.
Video Trimmer
Frame-accurate trim and merge across mixed resolutions.
100xNFT
Gated Solana NFT minting for the 100x Devs cohort.
GitHub Leaderboard
Open-source contribution ranking via the GitHub API.
Blinks
Solana Actions for betting, gated NFTs, and quizzes.
YouTube Downloader
FFmpeg pipeline for audio and video exports.
Poop Tracker (MicrobiomeDAO)
Microbiome tracking app shipped for an external DAO.
CPP Practice
494-commit competitive-programming archive.