> Markdown version of [/jobs/ext/4595839-frontend-engineer-ii-data-visualization-platform](https://www.wearedevelopers.com/jobs/ext/4595839-frontend-engineer-ii-data-visualization-platform). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Frontend Engineer II - Data Visualization Platform - **Company:** Ookla - **Location:** Madrid, Spain - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Data Visualization, Node.Js, Web Applications, ReactJS, Webpack, Front End Software Development, React Redux, Restful APIs - **Published:** November 6, 2026 - **Apply:** https://www.jobleads.com/es/job/frontend-engineer-ii-data-visualization-platform--madrid--ef29c2c88103d01deab579b5f683594ec ## About the Role You'll participate in agile delivery, contribute to UX improvements, and explore AI-assisted tooling to speed up development while maintaining human oversight. Strong collaboration and problem-solving are essential. ## Description Ookla is seeking a Software Engineer to join a team building next-generation platforms for data visualization and connectivity insights. You'll work across the stack with React, Redux Toolkit, Vite, and Node.js to deliver scalable web apps and robust RESTful APIs. You'll participate in agile delivery, contribute to UX improvements, and explore AI-assisted tooling to speed up development while maintaining human oversight. Strong collaboration and problem-solving are essential.