AI development & integration · New York
I build AI assistants and automations that plug into the tools you already use: your inbox, your docs, your CRM, your support desk. Small, scoped projects that ship in weeks and keep a human in the loop where it matters.
What I build
No new platform for your team to learn. The AI shows up where people already work and hands off to a person when it isn't sure.
01 · Assistants
A chat assistant for your site or your team that answers from your own docs, policies, and product data, with sources, and escalates what it can't answer.
e.g. website support bot · internal policy Q&A in Slack
02 · Automation
Inbox triage, lead intake, document processing, follow-ups. The repetitive reading-and-routing work that eats hours every week, handled by an AI pipeline you can audit.
e.g. email → classify → draft → approve → send
03 · Integration
Connect a model to Gmail, Google Workspace, Slack, HubSpot, Shopify, Notion, or your own database through clean APIs and MCP servers, with permissions scoped tightly.
e.g. CRM notes written from call transcripts
04 · Custom apps
Dashboards, portals, and back-office apps where AI does the heavy lifting: summarizing, extracting, searching, and drafting. Built in Next.js, hosted on Vercel, yours to keep.
e.g. quote builder · document search portal
How a project runs
Every engagement begins with one workflow and a number we both agree on, like hours saved per week or response time.
We walk through where your team's time goes and pick the one workflow where AI pays off fastest.
A working version on your real data, so you can judge the output before committing to a full build.
Production version connected to your tools, with logging, approval steps, and guardrails.
Docs your team can follow, training, and a monthly support option to tune prompts and add workflows.
Selected work
Three apps with Claude built in. The code is on GitHub.
Desktop app · AI assistant
A Path of Exile 1 & 2 overlay with price checks, a map-run tracker, an OAuth character viewer, and a Claude-powered trade assistant. Approved by the game's developer and running on a live API key.
AI: answers trade questions from live market data
Desktop app · AI advisor
A local-first personal finance app covering accounts, bills, budgets, debts, and goals. A rule engine ranks what to fix first, and a Claude advisor answers questions using your own numbers. Your data never leaves your machine.
AI: advice grounded in a private data snapshot
Desktop app · AI tutor
A study app for IT certifications. Claude writes quiz questions from each lesson's objectives, spaced repetition schedules the reviews, and XP and streaks keep you coming back. Unit-tested core, with installers built by GitHub Actions.
AI: generates questions and explanations per lesson
I'm Sean Mangin. Before I built AI systems, I spent years on the other side of the ticket queue.
I've handled 150+ support interactions a day in IT and customer support, and spent five years in merchandising execution at Home Depot. That's where I learned what actually slows a team down: the same questions, the same lookups, the same copy-paste between systems.
Now I build the tools I wish those teams had. I'm self-taught across the full stack, I build with Claude every day, and I design every automation the way a support lead would want it: logged, reversible, and with a person signing off on anything customer-facing.
Get in touch
Send a short note and I'll reply within one business day with whether AI is a good fit, and what a first prototype would look like.