UI Engineer II

Mollie

UI Engineer II developing mobile and web applications for Mollie. Focus on building seamless user experiences while supporting teams across multiple domains in a hybrid setting.

Posted 7/14/2026full-timeLisbon • 🇵🇹 PortugalMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in mobile app architecture and development, with a strong focus on React, React Native, and CI/CD processes. Capable of enhancing app accessibility and implementing robust testing practices to ensure high-quality user experiences.

Highest-signal resume keywords

React DevelopmentReact Native DevelopmentCI/CD Pipeline ExperienceTest-Driven DevelopmentJavaScript Fundamentals

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Mobile App DevelopmentWeb Application DevelopmentJavaScriptCSSREST API DesignDebuggingFeature DeliveryAutomation TestingRelease Process OwnershipAccessibility Compliance

Soft Skills

Strong CommunicationProduct-First MindsetGeneralist Mindset

Industry Keywords

Mobile App ArchitectureUI Design SystemUser Demand ScalingReusable PatternsDocumentation

Tech Stack

Tools & technologies

JavaScriptReactReact Native

About the role

Key responsibilities & impact

Scale the mobile app architecture to support growing user demand
Accelerate app release cadence by improving and owning the release process
Build reusable patterns, tooling, and documentation for mobile app contribution
Support debugging and feature delivery for teams across Mollie
Own and evolve the Mollie UI design system for consistency and quality
Rebuild and improve mobile navigation architecture
Improve app accessibility in line with compliance standards
Strengthen testing practices and automation to raise reliability

Requirements

What you’ll need

4 or more years of experience developing mobile apps and web applications
Solid hands-on React and/or React Native experience
Genuine, deep understanding of JavaScript fundamentals at a low level
Experience with CI/CD pipelines and app release processes
Comfort working with native browser APIs and language primitives
Enough CSS confidence to implement interfaces using design system components
A track record of building or maintaining products at medium to large scale
Experience with test-driven development and REST API design
A product-first mindset with end-to-end ownership
A generalist mindset with strong communication skill
Always Be Shipping mindset

Benefits

Comp & perks

Grow your way
Regular feedback and performance reviews
Fair and transparent salary reviews
Opportunities to develop skills and explore challenges