Senior Frontend Developer at Plain Concepts in Portugal

We’re looking for a Senior Frontend Developer to join our team for an initial 6 months project and help us build high-quality web applications used in real-world projects. You’ll work mainly with React and TypeScript, taking ownership of features from the initial idea through to production. You’ll also have the opportunity to work on some interesting challenges around 3D visualisation, interactive maps, and data-heavy applications.

What you’ll do

• Build and maintain web applications using React and TypeScript.

• Work closely with Product, Design, Backend, and other developers to turn requirements into solid technical solutions.

• Help shape and improve our frontend architecture and development practices.

• Make sure our applications are fast, responsive, accessible, and easy to maintain.

• Work with UI libraries and design systems to create consistent user experiences.

• Review code and share knowledge and best practices with the team.

• Work on 3D visualisations and interactive experiences directly in the browser.

• Develop features around interactive maps and geospatial data.

• 5+ years of experience in Frontend Development.

• Strong experience with React.

• Strong knowledge of TypeScript and JavaScript.

• Experience working on large or complex web applications.

• Good understanding of frontend architecture, patterns, and best practices.

• Experience integrating REST APIs and working with backend services.

• Strong knowledge of HTML, CSS, responsive design, and browser behaviour.

• Comfortable working with Git and modern development workflows.

• Ability to work independently, make technical decisions, and take responsibility for your work.

• Good communication skills and a collaborative mindset.

• English Level: Fluent

• All candidates must be based in Portugal or Brazil

Nice to have

• Experience with Material UI or other UI/component libraries.
• Experience with Tailwind CSS or similar frameworks.
• Experience with Three.js, WebGL, or other technologies for building 3D experiences in the browser.
• Experience with Mapbox, Leaflet, OpenLayers, or similar mapping technologies.
• Experience building applications involving large amounts of data or complex visualisations.
• Knowledge of frontend performance optimisation.
• Experience with automated testing.
• Experience working in an Agile/Scrum environment.

A little extra

We’re particularly interested in people who enjoy working on things beyond traditional frontend development. We have upcoming projects involving 3D visualisation in the browser, so experience with Three.js, WebGL, or similar technologies would be a big plus. We also work with applications where maps and geospatial data play an important role. Experience with mapping libraries such as Mapbox, Leaflet, or OpenLayers is therefore very welcome.

Most importantly, we’re looking for someone who enjoys solving problems, cares about the quality of what they build, and wants to have a real impact on the products they work on!