Patrick Marsceill, software designer

I'm a detail-oriented software designer with over a decade of experience making the world's best developer tools. My working style is hands-on and I enjoy writing code as much as untangling problems, designing interfaces, and collaborating with my team.

Work Experience

Notion 2026-present

Bringing AI to knowlege work.

Magic 2024-2026

Designed and built autonomous software development tools including several shapes for coding agents, internal tooling for reinforcment learning, and custom utilities for running and measuring evals on Magic's frontier coding models.

WorkOS 2022-2024

Led and managed the design of all products and marketing surfaces. Helped shape, design, build, and launch the entirety of WorkOS during my tenure.

• Launch Week
• User Management
• AuthKit
• Audit Logs
• Multi-Factor Authentication
• Radix AI
• WorkOS Classic: 404 page
• WorkOS.com

GitHub 2015-2022

Managed product design and was a Staff Designer for Code to Cloud and Productivity Tools teams.

• GitHub Projects & Issues
• GitHub Actions
• GitHub Packages
• GitHub Code Review
• GitHub Merge Queue
• GitHub Security
• GitHub.com

Happy Cog 2012-2015

Worked as a Senior Designer on product and marketing design projects for clients like Google, Trek Bicycles, MTV, and The Philadelphia Inquirer.

Empathy Lab 2008-2012

As a UX designer, I worked on product and ecommerce design for clients like DirecTV, Sony Pictures, and Rogers Communications.

Projects

MAP CLI

MAP (multi-agent platform) is a toolkit for running many coding agents locally in the same codebase. It enables spawning n agents, each in their own isolated worktree as well as a task queue and syncing with GitHub Projects.

• MAP CLI on GitHub
• My demo on Twitter

Plastic List

I designed and engineered the web interface for displaying microplastics in commonly available foods. This was a group project organized and funded by Nat Friedman.

• plasticlist.org
• Nat's Announcement on Twitter

This Modern Web

My personal website / blog — I tend to write about design and tech, my own life, and occasionally music and film.

• p.atrick.org
• RSS Feed

Aware

A MacOS and VisionOS app built with Josh Peek that tracks how long you've been using your device in a single sitting.

• awaremac.com
• Aware in the App Store

Feedster relaunching soon

A simple web-based RSS reader with public and private channels for sharing.

• Launch post on Twitter
• UI update on Twitter

Tab Lab

Write and share fully rendered guitar tablature authored in the easy-to-write VexTab syntax. Think markdown, but for guitar music. Sunset in 2016 due to hosting costs.

• Tab Lab on web.archive.org

Elsewhere

You can find me around the web as @pmarsceill in most places.

• GitHub
• Read.cv
• Twitter
• Strava