Summary
The Wikimedia Foundation is looking for a full stack Senior Software web Engineer contractor to join the App Growth team within the Core Experiences engineering on a 3-month full time contract.
This is not a native iOS or Android role. It is focused on web-first product experiences, APIs, and platform integrations that can be reused across mobile web and native app surfaces; to help us scale features across platforms and create compelling features that deepen reader engagement and increase user retention. You will build features that create natural handoffs between web and app and landing users in exactly the right place — for example, prompting a reader to try a personalized reading list in the app, creating a game that is integrated within the apps as a webview; or when someone tries to edit there is a smooth hand off to the web editing experience.
Important: We are a fully remote team at a integral organization. To ensure there are enough opportunities to communicate, this role needs at least four hours of your work day to occur between 15:00 UTC and 21:00 UTC.




You are responsible for:
- Delivery and enablement – Delivery of medium complexity initiatives from technical discovery through delivery. Breaks down initiatives into features, drive estimation and manage scope. Identifies risks early, and helps the team make pragmatic tradeoffs across quality, velocity, maintainability, and user impact.
- Frontend Implementation – Create mobile Wikipedia product experiences that serve a global, multilingual audience across web and app surfaces. You can design and build accessible, adaptable, scalable and reusable components.
- Backend Implementation – Creating RESTful APIs, from schema and contract design through to monitoring and iteration, to serve simple but scalable data pipelines to mobile and web client experiences at scale. Ensures pipelines and APIs remain simple to consume, reliable to operate, and straightforward to evolve over time.
- Quality, testing and

📌 Senior Software Engineer, Core Experiences (España)
🏢 Wikimedia Foundation
📍 España