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Timezone preference: GMT-5 through GMT+1Senior Software Engineer (Privacy)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.
You are a seasoned software engineer with experience building security features in large-scale systems. You understand the importance of testing and documentation, and common pitfalls in developing secure web applications. You have a passion for the WMF mission. We operate in a highly transparent manner, and the work we do touches thousands of editors every day.
You will be working primarily on our MediaWiki platform which powers Wikipedia. As a top 10 website, we must meet stringent performance standards while addressing new security challenges such as supporting modern authentication technologies, detecting and preventing platform abuse from bots, and planning and rolling out improvements to our security architecture by defending against emerging threats.
You Are Responsible ForHelping design, develop, and deliver security features, with safety and security in mindWorking with other engineering teams to ensure that they make safe and compliant architectural and implementation choicesLeading by example in code review, decision-making, and team culture — fostering transparency, empathy, and collaborationDeveloping, reviewing,



and deploying security features developed by the Foundation and community membersConducting internal and external security and privacy reviewsPerforming maintenance and addressing technical debt in security and privacy-critical componentsProviding support for application security and privacy incidents and operationsSkills And ExperienceWe value the right mindset and potential over a checklist of specific experiences, and these are the traits we’ve identified that make great additions to our team so far.5+ years of experience as a software engineer, ideally with focus on security or privacyAbility to work effectively in a modern web application – ours is mostly PHP and JavaScriptDeep PHP experience isn’t required, if you have enough experience in engineering, and back-end web development, to learn it and be usefulDriving technical quality and operational excellence by defining and reinforcing standards in testing, observability, and system reliabilityComfortably and autonomously creating proofs of concept, writing design documents, and breaking down complex projects into actionable tasks to support less experienced team membersExperience in developing secure software or security and privacy-related product featuresA strong interest in working with a talented security team and learning more specialist security skills such as exploiting and mitigating application-level vulnerabilitiesAbility to explain complex security issues and their implications on privacy and risk to non-technical audiencesSensitivity to the security and privacy challenges faced by participants in a large, international projectExperience working in a remote, distributed teamAdditionally, We’d Love It If You HaveExperience working on anti-abuse mechanisms, such as detecting bots or coordinated activityPrevious experience building security countermeasures against attacks on technologies at the web, backend, and database levelExperience finding and fixing security bugs and reviewing code for security gapsA working knowledge of threat modeling, secure design patterns and privacy by designPrior experience with MediaWiki or Wikimedia projectsContributions to open-source softwareAbout The Wikimedia FoundationThe Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects. Our vision is a world in which every single human can freely share in the sum of all knowledge. We believe that everyone has the potential to contribute something to our shared knowledge, and that everyone should be able to access that knowledge freely. We host Wikipedia and the Wikimedia projects, build software experiences for reading, contributing, and sharing Wikimedia content, support the volunteer communities and partners who make Wikimedia possible, and advocate for policies that enable Wikimedia and free knowledge to thrive.
The Wikimedia Foundation is a charitable, not-for-profit organization that relies on donations. We receive donations from millions of individuals around the world, with an average donation of about $15. We also receive donations through institutional grants and gifts. The Wikimedia Foundation is a United States 501(c)(3) tax-exempt organization with offices

📌 Senior Software Engineer (Málaga)
🏢 Wikimedia Foundation
📍 Málaga