Junior Mobile Engineer

During the last two years we crafted a product with solid basis to create, deploy and track Web Stories over the web. Now is the time for us to bring our App services to the next level by adding new features that will meet and anticipate our clients needs.

As a Junior Mobile Engineer, you will be committed to our core App projects. You will be actively participating in the development of new features and will be responsible for crafting polished user experiences and state‑of‑the‑art app‑based solutions.

Accompanied by Maxime, our Senior Mobile Engineer, you will have the opportunity to quickly develop your skills in:

Development of New Features – 60%

• Develop new product features on Android (Kotlin) and/or iOS (Swift).
• Implement UI enhancements using Android Views / Jetpack Compose or UIKit / SwiftUI.
• Deliver technical and functional fixes on existing components.
• Contribute to technical micro‑design topics, feasibility studies, or proof‑of‑concepts (POCs).
• Support the development of internal tools for development, debugging, and SDK validation.

Testing, QA & Validation – 30%

• Execute functional tests on features.
• Ensure no regressions on key user journeys.
• Reproduce bugs reported internally or by clients.
• Analyze observed behaviors using logs, devices, and simulators/emulators.
• Clearly document bugs, reproduction steps, and expected results.
• Contribute to progressively structuring non‑regression test scenarios.
• Recommend the most relevant checks prior to releases.

Delivery & Release – 10%

• Ensure that topics are ready for delivery from a code, QA, and validation standpoint.
• Participate in final checks before release.
• Support the smooth delivery of SDKs and other mobile‑related topics.
• Contribute to improving release workflows, validation checks, and overall delivery reliability.
• Participate in the continuous improvement of mobile tools and ways of working.

What we offer

• RTT days: every employee gets up two weeks of RTT
• Delightful healthcare insurance with Alan (100% coverage)
• Swile Card for your lunches (60% paid by JOIN)
• ClassPass : subscription for free classes and activities every month
• All the tools you need : Macbook Pro & noise‑cancelling headphones.
• Monthly activities supported by JOIN (climbing, bowling, virtual reality activities, ice skating, etc.).
• Office : office space in the heart of Paris ("Bonne‑Nouvelle" metro station).

Requirements

• 0-2 years of experience as a Mobile Engineer.
• First experience on Android (Kotlin) or iOS (Swift).
• Team player: value communication and work together with colleagues, technical or not.
• Show initiative and proactivity: anticipate needs, propose new ideas and put them forward.
• Passionate and curious: open‑minded and like to discover, learn and understand.
• Rigor and self‑organized.