Senior Frontend Engineer - Checkout (all genders)
About You SE & Co. KG1 day ago
Hamburg, GermanySenior
Responsibilities
- Architect and develop modular, embeddable checkout UI components using TypeScript and React.
- Implement state management and side effects with Redux Toolkit and redux-saga for multi-step checkout flows and payment redirects.
- Develop integrations with payment providers including Klarna, PayPal, and Apple Pay.
- Own integration contracts for embeddable web components, host events, and tracking in a multi-tenant environment.
- Optimize Core Web Vitals, load times, rendering performance, and conversion-focused user experience.
- Handle production issues across multiple tenant storefronts using observability tools such as Datadog.
- Build accessible, responsive, cross-browser-compatible checkout interfaces.
- Collaborate cross-functionally with Product, UX, Backend, and QA teams in agile workflows.
- Drive engineering standards through code reviews, architecture discussions, and technical refactoring.
- Extend the SCAYLE Checkout platform to support customer customizations through injectable content.
Requirements
- At least 5 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 in Strict Mode.
- 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-intensive, 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.
- Ability to balance technical quality with business priorities and avoid over-engineering.
- Fluent English communication, ownership, proactive problem solving, and adaptability in agile teams.
- Flutter knowledge is a nice-to-have.
- Experience building embeddable widgets, Web Components, or other frontends running on third-party websites is a plus.
- Enterprise business experience and confidence communicating with C-level stakeholders are preferred.
Benefits
- Inclusive workplace focused on acceptance, inclusion, and fairness.
- Flexible, creative environment supporting continuous development and international collaboration.
- 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.