Senior FE Engineer

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.