Frontend Engineer

About Checkmate and Mate.

Checkmate is a multichannel offers network loved by 100M shoppers and hundreds of leading brands.

mate. is your AI growth teammate, the eCommerce data network that agentically turns customer intelligence into revenue.

mate finds it, Checkmate goes and gets it. Checkmate is the distribution network, with 100M+ shoppers and 12B+ live intent signals. mate is the AI layer built on top of it: it resolves anonymous visitors, spots the revenue a brand is missing, and builds and executes the campaigns to capture it.

The combination is rare: a consumer product shoppers love and an AI growth engine brands depend on.

We work with leading brands like Everlane, Brooklinen, and Malbon, and we're backed by Google Ventures, Mantis VS, Fuel Capital, and others.

Role Overview

We're hiring a Front End Engineer to own the UI of Checkmate's shopper-facing products: our mobile app and desktop browser extension. You'll pair day to day with our Product Design Lead, turning product ideas and designs into polished, intuitive interfaces that shoppers use every day.

This is a UI-focused seat on a small team that ships quickly. If you care about how a feature feels as much as whether it works, and you'd rather get a first version in front of shoppers than wait on a perfect spec, this is your seat.

Please note: this role is a US-based role only and we cannot offer visa sponsorship for this role at this time.

What You'll Do

Build the Shopper Experience

• Build and ship UI across the Checkmate mobile app and desktop browser extension, the two places shoppers find and use their offers
• Turn designs into production UI that matches them down to the spacing, type, and motion
• Own the details that make a product feel finished: loading, empty, and error states, transitions, and interaction feedback

Partner with Design and Marketing

• Work side by side with our Product Design Lead to go from idea to shipped, prototyping in code when that's faster than a mockup
• Partner with our Head of Marketing to bring launches, campaigns, and new offer experiences to life in the product quickly
• Speak up with a better approach when something will look, feel, or perform worse than it could

Make the Extension Feel Right Everywhere

• Build extension UI that shows up cleanly on top of thousands of retailer sites, without breaking the page or getting in the shopper's way
• Ensure the extension experience fits seamlessly within a shopping journey for our millions of users
• Keep the app and extension fast, lightweight, and consistent across browsers and devices

Grow the Component System

• Build and maintain shared, reusable components so new features come together quickly and look consistent across every surface
• Help set our front-end standards through code reviews, accessibility, and performance
• Use AI tools (Cursor, Claude, and the like) to move faster while keeping full ownership of quality