The company is revolutionizing e\-commerce advertising by connecting post\-purchase shoppers with relevant cross\-sell opportunities. Our platform powers promotional ad experiences that appear immediately after checkout, helping shoppers discover complementary products while helping merchants drive incremental revenue. We’re a **seed\-stage company** tackling complex, 0 1 ad\-tech challenges — from real\-time bidding and analytics infrastructure to high\-performance frontend experiences that run across millions of checkouts every day. * **High impact:** Your work directly affects millions of users and drives real revenue. * **Complex challenges:** Build ad\-serving systems, analytics engines, and seamless Shopify integrations. * **Collaborative culture:** Work closely with technical founders who ship fast and care deeply about engineering craft. * **AI\-forward:** We leverage AI across product, automation, and development — and you’ll be encouraged to as well. **Responsibilities:** * Interactive ad units (post\-purchase overlays, carousels, scratch cards). * Responsive templates optimized for conversion and performance. * Embedded Shopify widgets, checkout extensions, and admin dashboards. * A/B testable UIs with analytics instrumentation. Requirements: **Tech Stack:** Next.js 15, React 19, TypeScript, Tailwind CSS, Polaris, Hydrogen, App Bridge, Remix, Playwright, Jest, AWS, Docker. **Requirements:** * 5\+ years of frontend development experience with React/Next.js and TypeScript. * Strong CSS, animations, and responsive design skills. * Experience with Shopify app development and iframe\-based components. * Performance optimization and Core Web Vitals expertise. **Mindset:** Pixel\-perfect, fast\-moving, and data\-driven — you care about speed, UX, and measurable impact.