Frontend Engineer
falcon labsDenver (CO)
About the role
Frontend Engineer Falcon Labs turns the post-transaction experience into an incremental revenue stream for online services and a rewarding moment for their customers. Our solution uses advanced technology and AI to deliver personalized, contextually relevant offers to consumers at their peak engagement moment, right after they complete a transaction. The moment after a transaction is one of the most underutilized surfaces in commerce: intent is high, trust is established, and attention is real, yet for most brands it still ends with a static confirmation screen. We operate across major e-commerce ecosystems (Shopify, Wix, and a growing set of technology partnerships), earn a take rate on advertiser conversions, and run on real-time decisioning, Snowflake analytics, and an expanding push into agentic automation across the network. We are a team of ad-tech veterans from the mobile advertising world (ironSource/Unity).
The Role:
- We need a frontend engineer who can build high-performance, responsive ad units and Shopify integrations. You'll work on promotional overlays, embedded widgets, and native Shopify app experiences that handle millions of impressions across desktop and mobile.
- What You'll BuildAd Unit Templates
- Interactive promotional overlays (scratch cards, carousel widgets, post-purchase offers)
- Responsive templates optimized for mobile/desktop conversion
- Performance-critical iframe-based components with cross-origin communicationA/B testable UI variations with real-time analytics integration
- Shopify Integrations
- Custom post-purchase extensions and checkout UIEmbedded widgets for order status and thank-you pages
- Admin dashboard for merchants to configure placements
- Maintenance and enhancement of existing Shopify apps (legacy, current)
- Performance & Optimization
- Lighthouse score optimization (targeting 90+ performance)
- Bundle size reduction and lazy loading strategies
- Image optimization and responsive asset delivery
- Real-time rendering performance profiling
- Tech Stack
- Frontend: Next.js 15, React 19, TypeScript, Tailwind CSSShopify: Polaris, Remix, Hydrogen, App Bridge
- Tooling: Webpack, Yarn Workspaces, Playwright, Jest
- Infrastructure: AWS, Docker, Sentry monitoring
What We're Looking For:
- Core Skills 4+ years frontend development with React/Next.js and TypeScriptStrong CSS skills - responsive design, animations, cross-browser compatibility
- Performance optimization experience (Core Web Vitals, bundle analysis)
- Shopify app development (Polaris, Liquid, App Bridge)
- Understanding of iframe communication, SDK development, or widget embedding
Nice to Have:
- E-commerce UI/UX patterns and conversion optimization
- Mobile-first development and touch interactions
- Experience with A/B testing frameworks
- MindsetSpeed matters - you balance velocity with quality
- Pixel-perfect - you care about design details and user experience
- Data-driven - you measure impact through metrics, not opinions
- Ownership - you see problems and fix them without being asked
Why Join?
- High-impact work: Your code directly affects millions in revenue
- Creative freedom: Design and build ad units from scratch
- Modern stack: Work with bleeding-edge React and Next.js features
- Learning culture: AI-first development, conference budget, experimental projects
Meaningful equity: Ground-floor opportunity at a seed-stage company with traction*Apply If you're excited about building high-performance e-commerce interfaces and want to own critical frontend infrastructure, we want to hear from you.
How to Apply: Send your CV and a short cover note to:jobs@falconlabs.com
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