Wikimedia Foundation · 2 days ago
Senior Software Engineer (Security)
United States
Full-time
Remote
Senior Level
5+ years expThe 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 hands-on role involves designing and implementing security features while working closely with engineers and product managers to ensure the platform remains resilient against attacks.
Computer Software
Hiring Manager
Alisa Nguyen
Responsibilities
Helping design, develop, and deliver security features, with safety and security in mind
Working with other engineering teams to ensure that they make safe 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
Performing security maintenance and addressing technical debt in security-critical components
Providing support for application security incidents and operations
Qualification
Required
5+ years of experience as a software engineer, ideally with focus on security
Ability to work effectively in a modern PHP and JavaScript codebase
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-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 challenges faced by participants in a large, international project
Experience working in a remote, distributed team
Preferred
Experience working on anti-abuse mechanisms such as CAPTCHA and bot detection
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 and secure design patterns
Prior experience with MediaWiki or Wikimedia projects
Contributions to open-source software
Company
Wikimedia Foundation
Wikimedia Foundation encourages the development and distribution of free educational content with projects such as Wikipedia.
501-1000 employees
H1B Sponsorship
Wikimedia Foundation has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2024 (4)
2023 (5)
2022 (3)
2021 (1)
2020 (5)
Funding
Current Stage
Late StageTotal Funding
$158.98MKey Investors
Alfred P. Sloan FoundationCraig Newmark PhilanthropiesGoogle.org
2020-01-01Grant· $2.1M
2019-09-10Grant· $2.5M
2019-01-22Grant· $1.1M
Leadership Team
Maryana Iskander
Chief Executive Officer
Denny Vrandečić
Head of Special Projects
Recent News
MarketScreener
2025-12-04
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