Front End Developer Internship - 6 months - Paris - W/M/NB

Join Karos, a company dedicated to sustainable mobility, as a Front End Developer Intern for a 6-month internship in Paris. You will work closely with the Front-End team to refactor and modernize pages and features, create new modular components, and help transition the code from JavaScript to TypeScript. This is a great opportunity for final-year Master's students in Computer Science or related fields to gain real-world app development experience and learn from senior engineers.

• Participer à la refonte et à la modernisation des pages et des fonctionnalités de l'application Front-End.
• Créer de nouveaux composants modulaires et refactoriser ceux existants, en aidant à la transition du code de JavaScript à TypeScript.
• Collaborer avec l'équipe pour livrer des fonctionnalités réelles utilisées quotidiennement par les utilisateurs.

What we’re looking for

• Final-year Master’s student in Computer Science or related field.
• Strong foundation in Front-end and JavaScript/TypeScript fundamentals (promises, try/catch, basic array methods, event loops, type generics etc.).
• Interest in modern Front-End design patterns and scalable app architecture.
• Familiarity with unit testing (and ideally component testing).
• Curiosity, autonomy, and eagerness to learn from senior engineers and build for real users.
• Collaborative mindset and curiosity for Front-End architecture and performance optimization.
• Bonus: experience with CI/CD (GitHub Actions) or API integration, experience with a backend language and framework.

• What you’ll gain
• By joining Karos, you’ll take part in real-world app development and learn how to deliver features from design to Live.

• Ship real product: contribute to user-facing features used daily
• Learn from our team through code reviews, pairing, and mentorship from frontend and backend engineers
• Grow your Vue 3 + TypeScript skills
• Develop strong engineering habits: testing practices, CI/CD exposure, and clean refactoring in a production codebase

Additional Information 🚗🌱

• A warm, inclusive, and supportive team
• Offices centrally located in Paris and easily accessible
• 💚 At Karos, we believe short-distance carpooling can become a new form of public transport — and we’re building it together.

Join us to create a sustainable mobility future.