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Alex Carpenter

Staff UI Engineer at Shopify

Grand Rapids, MI.

Steward of the web building composable interfaces for humans and agents.

Most recently on the SDK team at Clerk, I worked on UI components and theming infrastructure—building systems for customization, improving component APIs, and creating developer tooling that makes authentication interfaces more flexible and accessible.

I do my best work on small, highly collaborative teams that ship often and embrace the convergence of human craftsmanship with AI tooling. I care deeply about design and believe the best interfaces emerge when designers, engineers, and intelligent systems work together.

Experience

  • Shopify

    Staff UI Engineer

  • Clerk

    Staff UI Engineer

  • Watershed

    Lead Web Engineer

  • HashiCorp

    Senior Lead Web Engineer

  • NationBuilder

    UI Engineer

  • Mighty in the Midwest

    Senior Web Engineer

  • Masuga Design

    Front-end Developer

Recommendations

  • If you are seeking someone with deep expertise in web development, particularly with React, accessibility, animations, and a keen eye for design, then Alex is the perfect teammate. During my time at Clerk, I had the pleasure of working closely with Alex, and I can confidently say that he is an exceptional collaborator. His frontend web UI engineering skills are top-notch, and he is a fantastic human being.

    David Mosher

    Staff Software Engineer, Clerk

  • Alex is an excellent teammate and an exceptionally talented web developer. When he joined the team we gained an incredibly strong collaborator. His thoughtful approach to both producing work and actively reviewing code instantly improved the entire teams workflow. It is clear that Alex is a life long learner and therefore is always sure to bring a new, novel approach to solve a problem.

    Jimmy Merritello

    Web Engineer, HashiCorp

  • Alex and I worked together on the design team at NationBuilder. Alex is a natural problem solver, and a talented visual designer. That combination makes him an excellent front-end engineer. We worked together on a new feature with a complex UI and he was able to interpret the designs with a care and detail that is rare, while also making thoughtful UX suggestions. Not to mention Alex is just a great person, easy to talk to and lovely to work with.

    Amy Stuart

    Senior Designer, NationBuilder

  • I worked with Alex on a variety of different projects. He is excellent at his craft and a pleasure to collaborate with. His attention to detail always resulted in an extremely polished final product.

    Andrew Possehl

    Senior Designer, NationBuilder

  • Alex is incredibly skilled, efficient, and thorough in his work. Perhaps more than any other co-worker I have had, Alex possesses a deep and wide understanding of modern web technologies, while his steady passion for producing best-of-class work inspires his peers to write cleaner, simpler, and more elegant code.

    Kyle Luck

    Developer, Mighty in the Midwest

  • Alex is incredibly thorough and thoughtful with his work and is always seeking out improving in his craft. He’s conscious of meeting deadlines and communicates concerns early so that project teams can be proactive in problem solving.

    Danielle Dunn

    Project Manager, Mighty in the Midwest

  • I would recommend Alex to any forward-thinking web team. His passion for web standards along with his friendly attitude made him an invaluable part of our development team. I`m always especially impressed with his commitment to continuous learning and I hope to have the chance to work with him again!

    Melissa Taylor

    Director Client Services, Mighty in the Midwest

OSS Contributions

  • anomalyco/opencode

    Fix homepage video layout shift

  • benjitaylor/agentation

    Fix keyboard interactions when collapsed, allow toggling via keyboard

  • tanstack/tanstack.com

    Fix docs feature grid alignment and icon sizing

  • cloudflare/kumo

    Wrap pagination counts with tabular-nums to avoid shifts

  • vercel/next.js

    Improve templates layout flexibility

  • facebook/stylex

    Fix confirm dialog closing when clicking inside.

  • facebook/stylex

    Fixes issues in docs codeblock component where the icons were not rendering properly before the title, causing the title to not be properly aligned with the code, but also just not rendering the icon visibly.

  • facebook/stylex

    Align docs callout component icon to the first line of text.

  • fuma-nama/fumadocs

    Add missing ring classes for buttonVariants to ensure focus states are visible for buttons.

  • vercel/ai-chatbot

    Ensure both PureModelSelectorCompact and VisibilitySelector have visible outlines when focus visible.

  • haydenbleasel/kibo

    Fixes icon shrinking and alignment within pricing block when the feature text wraps to two lines.

  • fuma-nama/fumadocs

    Updates copy button to preserve the active state while in checked state.

  • midday-ai/midday

    Ensure icons are aligned on the first line vs being vertically centered within the whole item.

  • dodopayments/billingsdk

    Fix icon alignment within pricing-table-one

  • shadcn-ui/ui

    Add support for css imports

  • rauchg/blog

    Defines color scheme when in light/dark modes.