Senior Frontend Engineer - Checkout (all genders)

The Frontend Team builds the embeddable checkout, authentication and express-checkout web components behind SCAYLE’s Checkout as a Service which is our in-house eCommerce infrastructure licensed to online retailers. Tenant storefronts integrate them as a drop-in script, and the components own everything the customer sees from entering the checkout to order confirmation: authentication, addresses, payment selection and order placement, across many shops, countries and payment providers. Architecting and building modular checkout UI components in TypeScript and React , managing state and side effects with Redux Toolkit and redux-saga Developing payment provider integrations (e.g., Klarna, PayPal, Apple Pay), including widget and redirect flows Owning storefront integration contracts for multi-tenant setups, including embeddable web components, host events, and tracking Optimizing Core Web Vitals, loading speeds, and rendering performance to drive conversion rates and elevate user experience Monitoring and resolving production issues across tenant shops using observability tools like Datadog Translating complex checkout requirements into scalable solutions while ensuring WCAG accessibility , responsive design, and cross-browser compatibility Collaborating cross-functionally with Product, UX, Backend, and QA teams in daily agile workflows to ship features like one-page or multi-step checkout flows Driving engineering standards through thorough code reviews, architectural discussi