Senior Frontend Engineer

We are currently seeking an experienced Senior Frontend Engineer to join our team in support of our US-based partner company. Our partner operates a diversified, M&A-driven platform spanning mobile apps, device licensing, media, and financial services. It is the parent company of a portfolio of technology businesses, including a mobile business that empowers users worldwide to monetize everyday mobile activities such as streaming, gaming, and shopping.

As a Senior Frontend Engineer, you will lead the design, development, and optimization of user-facing features across our web and mobile experiences. You will own core user flows, build clean and reusable components, and deliver fast, intuitive, and polished experiences that delight users at scale.

This is a hands-on, high-impact role ideal for someone who loves building beautiful interfaces, optimizing performance, and shipping features that users can feel instantly. You’ll collaborate closely with backend, product, and design to bring new capabilities to market through rapid iterations and continuous deployment.

Responsibilities:

• Architect, build, and maintain scalable frontend features that power core user experiences, product workflows, and automation capabilities
• Build scalable, reusable UI components and design systems
• Implement responsive layouts and accessibility best practices across devices
• Optimize rendering performance, page speed, code splitting, and asset delivery
• Monitor frontend performance, error tracking, and user session metrics
• Identify frontend bottlenecks and drive improvements to user experience and conversion
• Implement features for web-first experiences with support for React Native mobile surfaces
• Collaborate with backend engineers to integrate REST APIs and real-time features
• Work in 2-week sprints with CI/CD and code review best practices
• Contribute to frontend architecture decisions, tooling, state management, and build pipelines
• Maintain a high standard of code quality, documentation, and testing
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Qualifications:

• 6+ years of frontend engineering experience, ideally in consumer apps, SaaS, or browser-based utilities
• Expert-level proficiency in React Native + TypeScript (core to this role)
• Production experience with React Native or ReactJS (mobile required, web preferred)
• Strong understanding of JavaScript fundamentals, modern frontend patterns, and component architecture
• Experience integrating UI with APIs (REST, real-time, or event-based)
• Familiarity with mobile UI patterns on Android/iOS (React Native)
• Experience optimizing performance, accessibility, and rendering efficiency
• Experience with visual debugging, error monitoring, and analytics tools (e.g., Sentry, LogRocket, PostHog, Amplitude, Mixpanel)

Preferred

• Experience designing and implementing responsive, user-friendly interfaces for complex workflows, data-rich experiences, filtering, and list-based views
• Experience building mobile apps with Expo platform
• Experience working in Node-based frontend build environments (Next.js, Vite, Webpack)
• Experience building Chrome or browser extensions
• Familiarity with Firebase for auth, messaging, or real-time features

Nice to Have

• Experience with feature flags, experimentation, or A/B testing
• AI-assisted development (GitHub Copilot, Cursor, etc.)
• Exposure to design systems, storybook libraries, or component frameworks
• Experience with user session replay, heatmaps, or performance logging

We offer:

• Full-time, remote work
• Working hours: Monday to Friday, start from 11am CET or later
• Private health insurace from day 1
• Timely and organized performance reviews

If this seems like the right job for you, we invite you to submit your resume in English. Please keep in mind that resumes in other languages might not be considered.