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Wikimedia Foundation Logo Wikimedia Foundation · IT - Software Development

Senior Software Engineer (Privacy)

United States of America, San Francisco 113082.00 - 175725.00 USD / Year · Job Posted January 31, 2026
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Job Description

The Wikimedia Foundation is looking for a Senior Software Engineer to join the Product Safety and Integrity team and build new security features to protect Wikipedia and our other projects. This is a very hands-on engineering role, working alongside a team of engineers and product managers to design and implement new features to protect and reassure our users and to ensure the platform remains resilient against attacks.

Job Responsibility

  • Helping design, develop, and deliver security features, with safety and security in mind
  • Working with other engineering teams to ensure that they make safe and compliant architectural and implementation choices
  • Leading by example in code review, decision-making, and team culture — fostering transparency, empathy, and collaboration
  • Developing, reviewing, and deploying security features developed by the Foundation and community members
  • Conducting internal and external security and privacy reviews
  • Performing maintenance and addressing technical debt in security and privacy-critical components
  • Providing support for application security and privacy incidents and operations

Requirements

  • 5+ years of experience as a software engineer, ideally with focus on security or privacy
  • Ability to work effectively in a modern web application – ours is mostly PHP and JavaScript
  • Driving technical quality and operational excellence by defining and reinforcing standards in testing, observability, and system reliability
  • Comfortably and autonomously creating proofs of concept, writing design documents, and breaking down complex projects into actionable tasks to support less experienced team members
  • Experience in developing secure software or security and privacy-related product features
  • A strong interest in working with a talented security team and learning more specialist security skills such as exploiting and mitigating application-level vulnerabilities
  • Ability to explain complex security issues and their implications on privacy and risk to non-technical audiences
  • Sensitivity to the security and privacy challenges faced by participants in a large, international project
  • Experience working in a remote, distributed team

Nice to have

  • Experience working on anti-abuse mechanisms, such as detecting bots or coordinated activity
  • Previous experience building security countermeasures against attacks on technologies at the web, backend, and database level
  • Experience finding and fixing security bugs and reviewing code for security gaps
  • A working knowledge of threat modeling, secure design patterns and privacy by design
  • Prior experience with MediaWiki or Wikimedia projects
  • Contributions to open-source software
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