Senior Frontend Engineer - Checkout (all genders)
About You SE & Co. KG1 day ago
Hamburg, GermanySenior
Responsibilities
- Develop modular, embeddable checkout UI components using TypeScript, React, Redux Toolkit, and redux-saga.
- Build and maintain payment-provider integrations including widget and redirect flows for Klarna, PayPal, and Apple Pay.
- Own integration contracts for multi-tenant web components, host events, and tracking.
- Optimize Core Web Vitals, loading times, rendering performance, conversion rates, and user experience.
- Troubleshoot production issues across multiple merchant shops using observability tools such as Datadog.
- Implement accessible, responsive, internationalized, and cross-browser-compatible checkout flows.
- Collaborate with Product, UX, Backend, and QA teams to deliver one-page and multi-step checkout experiences.
- Raise engineering standards through code reviews, architecture discussions, and technical refactoring.
- Extend the core checkout platform to support customer customization through injectable content.
Requirements
- At least five years of frontend engineering experience with senior-level responsibility, including enterprise experience or leadership of complex frontend setups.
- Strong knowledge of modern JavaScript ES6+ and advanced TypeScript using strict mode.
- Professional experience developing complex UIs with React 19, Redux Toolkit, and redux-saga.
- Experience optimizing web performance and Core Web Vitals.
- Experience with semantic HTML5 and scalable CSS architectures using SCSS, BEM, and modern design systems.
- Experience building form-heavy, internationalized UIs with Formik and react-intl in multi-tenant REST API environments.
- Experience writing automated tests with Jest and React Testing Library and working with modern CI/CD pipelines.
- Pragmatic judgment for balancing technical excellence with business priorities without over-engineering.
- Fluent business English, transparent communication, ownership, proactive problem solving, and adaptability in agile teams.
- Preferred: experience building embeddable widgets or Web Components for third-party websites.
- Preferred: enterprise business understanding and confidence communicating with C-level stakeholders.
- Preferred: Flutter knowledge.
Benefits
- Inclusive and fair work environment that welcomes diverse backgrounds and perspectives.
- Culture focused on innovation, international collaboration, data, flexibility, creativity, and continuous development.
- Online application process with prompt feedback.
Tech Stack
Categories
About About You SE & Co. KG
ABOUT YOU SE & Co. KG operates an online fashion marketplace for European consumers and licenses commerce technology to brands via its SCAYLE platform. The group sells apparel and lifestyle products through its mobile app and aboutyou.com, and offers a cloud-based enterprise shop system under a license model to retailers. Founded in 2014 and headquartered in Hamburg, it is a publicly listed company.