UI engineer for merchant experience

Mollie provides payment and money management products for businesses in Europe, helping them get paid, manage money, and grow. Its products are designed to be simple, scalable, and dependable.

• Scale the mobile app architecture to support growing user demand, with a focus on quality and long-term maintainability
• Improve and own the release process to accelerate app deployments from bi-weekly to weekly
• Build reusable patterns, tooling, and documentation that enable engineers across domains to contribute to the mobile app without deep mobile expertise
• Support debugging and feature delivery for teams across Mollie, acting as a platform partner to product teams that depend on the AppCore foundations
• Own and evolve the Mollie UI design system to ensure consistency and quality across web and mobile
• Rebuild and improve the mobile navigation architecture, including system design and visual experience
• Improve app accessibility in line with compliance standards
• Strengthen testing practices and automation to improve reliability and reduce regressions across the app
• Own the Upsell infrastructure and in-app messaging for targeted campaigns that drive merchant engagement and product activation

• At least 4 years of experience developing mobile apps and web applications
• Hands-on experience with React and/or React Native
• Deep understanding of JavaScript fundamentals at a low level
• Experience with CI/CD pipelines and app release processes
• Comfortable working with native browser APIs and language primitives
• Confident using CSS to implement interfaces with design system components
• Experience building or maintaining medium- to large-scale products where code quality, reliability, and performance matter
• Experience with test-driven development and REST API design
• Product-first mindset and end-to-end ownership, from design iteration through delivery, focused on user experience and measurable outcomes
• Generalist mindset and strong communication skills
• Consistently deliver customer value while balancing speed and quality

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