Web UI Developer

We develop tools to monitor the quality ofinternet connections across Germany. Our systemstrack the performance of Vodafone’s cable networksand provide measurement data to ComputerBild magazine for its annual comparison ofcellular operators. Millions of people use ourweb, mobile, and TV apps. In doing so, we activelycontribute to improving internet quality inGermany – a contribution we are proud of.

Web UI Developer
Front-end / Web UI Development & Functional Programming

You will develop intuitive, usable, consistent,and accessible user interfaces that inspire users. You will start by analysing UX/UI mockups and building simple, reusable components that together form a fully responsive UI—from the smallest mobile screen to a full-size desktop monitor. You will make the UI accessible. Then you will design a software architecture based on the principles of functional programming. The architecture will be simple and easy to maintain, provide access points for automated testing, and deliver high performance. You will implement your architecture using modern web technologies and develop an automated test suite to validate your implementation. You will iterate on your architecture by proposing and discussing improvements with stakeholders, the graphicdesigner, and back-end engineers. You will advise other software developers on UI-related issues.

You will gain experience in:

• General principles of human–computer interface design
• Responsive UI
• Accessibility
• Animations
• Design tools: Figma
• Functional architecture: Flux, Elm, Redux.js
• Front-end frameworks: React.js, Halogen, Emotion.js, Next.js
• Automated testing: Cypress, Mocha
• Modern web technologies: flexbox and grid layout, Web Workers, offline mode, spatial keyboard navigation, web components, Shadow DOM, server-side rendering
• Programming languages: TypeScript, PureScript
• CI/CD: Parcel, Webpack, GitLab, Docker
• Analytics: Matomo
• Software security

Required:

• B. Sc. in Computer Science or B. Sc. in Media Informatics from a recognized university
• Aesthetic intuition and drawing skills

Preferred:

• Ability to learn new technologies quickly
• Ability to sketch UX wireframes
• Capacity to work independently—researching solutions, making decisions, and taking responsibility for results

At Visonum, we are a small and fast-growingcompany. Working with us means:

• Direct ownership: The code you write and the systems you design will immediately shape our product.
• Fast impact: Your contributions will quickly make their way into production, serving millions of users and delivering tangible results.
• Mentorship: We value continuous learning and collaboration. You will work closely with experienced engineers, receive constructive feedback, and have opportunities to both learn from and mentor others.

We work primarily on a remote basis, withoccasional in-person meetings. Our office islocated in Grünwald.
Compensation: competitive salary.

• Send us your CV
• If your profile matches, we will inviteyou to an interview via Zoom and guide you throughthe next steps

Computer Science, Data, AI