Descriptif du poste

Are you passionate about iOS development and eager to build real features with an experienced team? Join Karos for a 6-month internship (Starting between December 2025 and March 2026) and help us evolve our iOS app — connecting thousands of daily carpoolers and accelerating the shift toward sustainable mobility.

Your mission

Under the guidance of our Mobile team, you will:

• Develop and refine user interfaces using SwiftUI, with a strong focus on performance, design fidelity, and accessibility.

• Write and maintain unit and UI tests to ensure code quality and reliability.

• Contribute to architectural decisions, refactoring, and continuous codebase improvement.

• Collaborate closely with backend, design, and product teams to ship impactful updates to real users.

• Learn and apply best practices in Swift, SwiftUI, and testing frameworks, while contributing to the continuous improvement of our mobile stack.

What we’re looking for

• Final-year Master’s student in Computer Science or related field.

• Strong foundation in Swift and iOS fundamentals (UIKit, SwiftUI, Combine, etc.).

• Interest in modern iOS design patterns and scalable app architecture.

• Familiarity with unit testing (XCTest, snapshot testing).

• Curiosity, autonomy, and eagerness to learn from senior engineers and build for real users.

• Collaborative mindset and curiosity for mobile architecture and performance optimization.

• Bonus: experience with CI/CD (GitHub Actions, Fastlane) or API integration.

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 App Store.

• Hands-on experience in a fast-paced, mission-driven startup.

• Mentorship from senior iOS developers and product designers.

• Deep dive into SwiftUI and modern testing tools.

• The opportunity to build and ship features used daily by thousands of users.

• Insight into how technology can drive sustainable mobility and reduce carbon impact.

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.

• Initial interview — Get to know our iOS Tech Lead & Mobile Engineering Manager and share your background and goals.

• Technical interview — Explore Swift, SwiftUI, and testing concepts through practical discussions.