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Wikimedia Foundation Logo Wikimedia Foundation · IT - Software Development

Senior Software Engineer, IOS

United States Employment contract 113082.00 - 175725.00 USD / Year · Job Posted May 27, 2026
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Job Description

The Wikimedia Foundation is looking for a Senior Software Engineer, iOS to join the App Growth team within the Core Experiences engineering group. The App Growth team has a clear and ambitious goal: make the apps the destination for knowledge lovers and grow our active readership. The team owns the cross-platform feature framework for the app, making decisions about where a feature lives when the app is the destination and where its primary value is unlocked.

Job Responsibility

  • Delivery and enablement - Consistently leads the team in the delivery of medium complexity initiatives (with support) from technical discovery through delivery
  • Implementation - Improving the mobile Wikipedia product experiences that serve a global, multilingual audience on iOS
  • Quality, testing and observability - Consistently builds and improves systems & software that is easy to test, observe and debug
  • Cross-functional collaboration - Partners with product managers, designers, analysts, and native app engineers to shape pragmatic solutions
  • Prioritisation - Proactively identifies high-impact technical opportunities and risks across a quarter
  • Mentorship - Actively supports the growth and success of others
  • Culture and standards - Raises team standards in code review, technical design, testing, documentation, accessibility, observability, and decision-making
  • Operational Awareness - Plans work with awareness of downstream or upstream effects
  • Actively supports hiring and onboarding

Requirements

  • Bachelor's and 5+ years related professional experience with significant experience building iOS applications
  • Strong professional experience and proficiency with Swift, SwiftUI, UIKit, and familiarity with architectural patterns in iOS
  • Experience of iOS performance optimisation techniques to ensure smooth, responsive, and high-performing applications under a variety of conditions
  • Experience working in a self-driven, lean environment
  • Commitment to the Foundation's Mission and Values

Nice to have

  • Experience adding webview-wrapped experiences to existing native mobile apps (iOS or Android)
  • Experience in maintaining cross-platform mobile applications
  • Experience building mobile games or other interactive mobile experiences
  • Experience with data science, machine learning, and/or AI (e.g., familiarity with prompt engineering, Jupyter notebooks experience, etc.)
  • Familiarity with Wikipedia / wikitext / markdown editing or content management systems (e.g., MediaWiki, Drupal, WordPress)
  • Experience with leveraging agentic coding to scale the work of small engineering teams
  • Bachelor's, master's, or doctorate degree in computer science, management information systems, or STEM field (or equivalent certification)
  • Prior experience with MediaWiki or Wikimedia projects
  • A history of open source contributions
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