Software Engineer III, Core Experiences

About the Role

The Wikimedia Foundation is hiring two Software Engineer IIIs to join the App Growth and Editing Engineering teams within the Core Experiences engineering group. This role focuses on web-first product experiences, APIs, and platform integrations that span mobile web and native apps. The App Growth role emphasizes features that smooth handoffs from web to app and engage readers; the Editing role centers on the VisualEditor and related tools to improve editing workflows. Both roles require collaboration and clear communication, with daily work hours overlapping UTC windows (App Growth between 14:00–21:00 UTC; Editing between 15:00–18:00 UTC).

What You'll Do

• Delivery and enablement: break down features into tasks, anticipate risks, and resolve blockers.

• Implementation: build moderately complex features and components with minimal support; suggest areas for architectural improvements.

• Production support: take ownership of bug fixes and production problems; communicate impact and resolution.

• Quality, testing and observability: design features with observability and testing in mind; instrument features for deeper Product Analyst analysis; contribute to healthier testing and software quality.

• Cross-functional collaboration: align with partners, facilitate ceremonies, and coordinate work.

• Prioritisation: help scope work, identify risks across sprints, and adapt as priorities shift.

• Culture and standards: participate in code reviews, design discussions, and technical planning; share knowledge and improve workflows.

• Operational Awareness: consider how code affects usage and trust; contribute to onboarding, documentation, and hiring at the team level.

• What We're Looking For

• Bachelor's degree and at least 2 years or equivalent professional web application experience.

• Experience with backend languages like PHP or Python and/or frontend 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 incorporating performance and accessibility into features.

• Experience in writing well-documented and readable code.

• Nice to Have

• Experience working in a fully remote, internationally distributed teams or organizations.

• Experience working with large, legacy codebases.

• A history of open source contributions.

• Prior experience with MediaWiki or Wikimedia projects.

• Compensation & Benefits

• Salary information not disclosed.