Mobile/Frontend AI Software Engineer (all) at XO Life – Berlin | Jobyssey

We are seeking a Mobile/Frontend AI Software Engineer to join our engineering team to build user-facing solutions that power our digital health platform and help the platform grow. This role focuses on owning, designing, and implementing client-side applications, shaping the frontend strategy while creating seamless user experiences in close collaboration with backend services and APIs. Development

Own and build responsive and intuitive mobile-first user interfaces using React and React Native
Drive the implementation of modern UI/UX designs with strong attention to accessibility and performance
Integrate frontend applications with backend APIs and services
Optimize application performance and implement efficient state management
Develop cross-platform mobile applications using Expo and React Native

Engineering Tools

AI-assisted development: Ability to effectively use AI tools in daily development work

System Architecture & Integration

Own and shape frontend architectures that scale from web to mobile
Integrate third-party APIs and services
Implement real-time features using WebSockets

Infrastructure & Deployment

Work with cloud-based environments (AWS, GCP) to support frontend applications
Collaborate on CI/CD pipelines impacting frontend delivery
Monitor application performance and troubleshoot frontend-related issues
Ensure security best practices in frontend implementation

Collaboration & Quality

Take full ownership of the quality of the produced frontend outcome
Partner closely with product managers, designers, and other engineers to shape frontend solutions
Set, uphold, and evolve frontend quality standards through code reviews
Write comprehensive technical documentation

Education & Experience

Bachelor’s degree in Computer Science, Software Engineering, or related field OR equivalent work experience with a strong technical portfolio
7+ years of product development experience with a strong frontend focus
Experience with growth techniques
Experience with testing frameworks (unit, integration, end-to-end)
Experience with performance optimization and monitoring tools
Experience with mobile-first development and responsive design

Frontend Technical Skills

JavaScript / TypeScript: Expert-level proficiency in modern JavaScript (ES6+)
React: Strong experience with React, hooks, context API, and state management
CSS / Styling: Proficiency in modern CSS, styled-components, or similar
Build Tools: Webpack, Vite, or similar bundling tools
Expo: Familiarity with Expo framework and development workflow
React Native: Experience building cross-platform mobile applications

Soft Skills

Strong problem-solving and analytical abilities
Good communication and teamwork abilities
Deep product- and customer-centric mindset

Preferred Qualifications

Understanding of accessibility standards
Familiarity with design systems and component libraries
Experience with mobile-specific features (push notifications, offline storage)
Knowledge of mobile performance optimization

Top Tech company in Digital Health: A dynamic, high-growth environment where everyone in the team depends on each other's performance. You can see your impact. We learn and develop quickly.

True impact in healthcare: What we are building with our brite platform is unique worldwide, ambitious, and could have a huge impact on billions of people who are ill or interested in health.
International team: Join colleagues from 14+ nationalities, united by a shared vision.

Recruiter Screening: Technical phone/video introductory and experience call.
Leadership Interview: Discussion focused on leadership principles, values, and cultural fit.
Technical Deep Dive: Live coding session covering React, React Native, and Expo.

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