Frontend Engineer

falconlabs.com; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Remote work

Equity opportunity

Learning budget

Job summary

Falcon Labs is seeking a frontend engineer to build high-performance, responsive ad units and Shopify integrations that handle millions of impressions across desktop and mobile. You will own interactive components, ensure cross-browser compatibility, and contribute to the merchant-facing admin dashboard and analytics.

Collaborate on a modern stack with Next.js, React, and TypeScript, drive performance improvements, and ship iframe-based widgets and post-purchase extensions.

Qualifications

• 4+ years of frontend development experience with React, Next.js, and TypeScript.
• Strong CSS skills across responsive design and cross-browser compatibility.
• Experience optimizing performance including Core Web Vitals and bundle analysis.
• Shopify app development experience using Polaris, Liquid and App Bridge.
• Understanding iframe communication and widget embedding patterns.

Responsibilities

• Build interactive ad unit templates optimized for mobile and desktop conversion.
• Develop iframe-based components with cross-origin communication.
• Create A/B testable UI variations wired into real-time analytics.
• Ship Shopify post-purchase extensions, checkout UI, and embedded widgets.
• Maintain and extend Shopify apps and a merchant-facing admin dashboard.
• Drive performance work including Lighthouse optimization and image optimization.

Skills

React

Next.js

TypeScript

CSS

Performance optimization

Iframe/SDK patterns

Tools

Shopify Polaris

Shopify Liquid

Shopify App Bridge

Job description

Role overview

This role is for a frontend engineer who will build high-performance, responsive ad units and Shopify integrations that handle millions of impressions across desktop and mobile. The work spans promotional overlays, embedded widgets, and native Shopify app experiences, balancing creative freedom with a strong performance bar.

Responsibilities

• Build interactive ad unit templates such as scratch cards, carousels, and post-purchase offers, optimized for mobile and desktop conversion
• Develop iframe-based components with reliable cross-origin communication
• Create A/B testable UI variations wired into real-time analytics
• Ship custom Shopify post-purchase extensions, checkout UI, and embedded order-status or thank-you widgets
• Maintain and extend existing Shopify apps and a merchant-facing admin dashboard for configuration
• Drive performance work including Lighthouse optimization, bundle size reduction, lazy loading, image optimization, and rendering profiling

Requirements

• 4+ years of frontend development experience with React, Next.js, and TypeScript
• Strong CSS skills across responsive design, animations, and cross-browser compatibility
• Hands-on performance optimization experience including Core Web Vitals and bundle analysis
• Shopify app development experience using Polaris, Liquid, and App Bridge
• Understanding of iframe communication, SDK development, or widget embedding patterns

Nice to have

• Familiarity with e-commerce UI/UX patterns and conversion optimization
• Mobile-first development experience with touch interactions
• Experience working with A/B testing frameworks

Benefits and work setup

• Remote, global work arrangement
• Modern stack including Next.js 15, React 19, TypeScript, Tailwind CSS, Shopify Hydrogen and Remix, Playwright, Jest, AWS, Docker, and Sentry
• Culture emphasizing velocity, pixel-perfect execution, data-driven impact, and ownership
• Ground-floor equity opportunity and a learning budget that supports AI-first development and experimental projects