Software Engineer III, Core Experiences

The Wikimedia Foundation is looking for two Software Engineer III’s to join the App Growth and Moderator Tools Engineering teams within the Core Experiences engineering group. The role involves building features for mobile apps and tools for volunteer patrollers, focusing on web-first product experiences and collaborative software development.

Responsibilities:

• Supports delivery of initiatives. Breaks down complex features into tasks, anticipates risks and collaborates to resolve blockers
• Can successfully build moderately complex features and components with minimal support and suggests areas for architectural improvements
• Takes ownership of bug fixes and production problems and communicates in a clear and timely way about impact and resolution
• Designs and improves features with observability and testing as a core consideration. Instruments features that enable deeper analysis by Product Analysts. Contributes to healthier testing and software quality practices
• Supports team alignment by asking clarifying questions, reinforcing agreements, and coordinating their work with cross-functional partners. Facilitates team ceremonies
• Contributes meaningfully to planning. Helps scope work. Identifies risks across multiple sprints. Adapts as priorities shift
• Participates in code reviews, design discussions, and technical planning; shares knowledge proactively; and helps improve team development workflows
• Thinks through how code affects usage and trust. Contributes to onboarding, documentation, and hiring efforts at the team level

Requirements:

• Bachelor's + at least 2 years or equivalent professional web application experience
• Experience working with backend languages like PHP or Python and/or experience with front end languages particularly with Javascript frameworks
• A demonstrated ability to deliver testable, user-friendly features in a collaborative team environment
• Experience building responsive or mobile-first web experiences
• Experience converting design mockups into functional components
• Experience building features with observability and testing in mind
• Experience with incorporating performance and accessibility into features
• Experience in writing well-documented and readable code
• Experience working in a fully remote, internationally distributed teams or organizations team
• Experience working with large, legacy codebases
• A history of open source contributions
• Prior experience with MediaWiki or Wikimedia projects
• Familiarity with Wikipedia / wikitext / markdown editing or content management systems (e.g., MediaWiki, Drupal, WordPress)
• Some experience with data science, machine learning, and/or AI (e.g., familiarity with prompt engineering, Jupyter notebooks experience, etc.)
• Experience in launching and maintaining mobile applications, cross platform app frameworks, or building webview-wrapped experiences in native mobile apps
• Experience building mobile games or other interactive experiences
• Experience with at least one Python framework, such as Django or Tornado