Senior FS Engineer

Description

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:

• Frontend: Next.js 15, React 19, TypeScript, Tailwind CSS
• Shopify: Polaris, Hydrogen (Remix), App Bridge
• Backend & Infra: Node.js, AWS, Docker
• Testing: Playwright, Jest

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.