First I plugged products into browsers. Now I plug them into AI agents.
I’m Zack Babtkis — ex-PayPal Senior Staff, founding engineer at ZeroClick. I build websites, apps, and browser extensions — and the infrastructure and integrations for agentic AI.
01 — Who you're hiring
Zack Babtkis
You work with me directly: I take the intro call, write the code, and deliver the work.
I’ve also designed, built, and shipped two products alone: TrueRate, a Chrome extension that exposed hidden hotel fees on the major booking sites, and Unhabit, an iOS Safari extension that blocks distracting websites. Together they reached tens of thousands of installs.
LinkedIn · GitHub · the longer story · references on request
02 — Services
What I'm hired for
Chrome Safari & iOS
Your extension doesn’t exist on Safari or iPhone. I built Honey’s first iOS extension and owned Pie’s — I’ll port yours and get it through App Store review.
Port assessment · $2,500MCP servers that put your product in front of AI agents
Your customers are asking for a Claude or ChatGPT integration. I built agent-facing APIs at ZeroClick — I’ll build your MCP server and take it through directory submission.
MCP readiness audit · $2,000AI-agent enablement for engineering teams
Your team has the AI tools and little shipped to show for it. At ZeroClick I shipped a product where AI agents wrote the whole codebase — I’ll set your team up to work that way.
Agent-readiness audit · $3,000Your AI-built POC, taken to production
You vibe-coded something that works — mostly. I make it survive real users: tests, auth, data, deployment.
Production readiness audit · $2,50003 — Track record
Where I've shipped
PayPal Honey
Senior Staff engineer · designed and built its first iOS browser extension · $4B exit to PayPal20M+ users
Pie Adblock
Founding engineer · owned the Safari and iOS extensions, led the Creator Network2M+ users · 4.9★
pie.yt
Built and shipped it solo — the entire codebase written by AI agents I directedLive — go try it
ZeroClick
Agent-commerce infrastructure: APIs and MCP servers where AI agents are the customer2 years in production
TrueRate
Chrome extension that revealed hidden hotel fees (resort, wifi, parking) on Expedia, Hotels.com, Travelocity, and Orbitz — extension, scraping API, and iOS appBuilt solo · 2019–2020
Unhabit
iOS Safari extension that blocks distracting sites — cooldowns, scheduling, on-device privacyiOS App Store · 2023Earlier: the 2015 UX Award–winning DSP dashboard at The Mobile Majority (now Infillion), ProducePay’s Pre-Season financing platform, and the NEES@UCSB real-time seismic data portal at UC Santa Barbara’s Earth Research Institute.
Working on something like this?
Tell me what you're building and what's in your way. I read every message myself. If I'm not the right person for the job, I'll tell you, and I'll suggest someone who is.