Senior Software Engineer, MediaWiki Summary The Wikimedia Foundation is looking for a Senior Software Engineer to join the MediaWiki Platform team. MediaWiki is the open-source platform that powers Wikipedia and its sister projects
- impacting hundreds of millions of Wikipedia users across the globe. The team’s mission is to provide a solid foundation for feature teams to build on. It focuses on performance, reliability and scalability, helping to ensure broad and equitable access to free knowledge. Important: We are a fully remote team. 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; Championing key product metrics by focusing on measurable outcomes that guide our decisions and help us to evaluate success; Collaborating with the Product team and the community to ensure technical solutions align with WMF strategy, feature teams and volunteer contributor needs; Coaching and mentoring teammates to support continuous growth and confidence in both technical and interpersonal skills. Qualities we are looking for: Accountable: You own your work end-to-end and help establish a culture of responsibility and follow-through; Commitment to the Foundation's Mission and Values ; Extensive experience in backend software engineering; Experience with databases and event streams, including schema design, query optimization, and efficient data access patterns; Deep understanding of software architecture, testing methodologies, and system design; Strong experience in observability practices: setting up metrics, logging, monitoring, and alerting; Familiarity with incident response, root cause analysis,



and follow-up processes; Proficiency in PHP and JavaScript; Prior experience with MediaWiki or Wikimedia projects; Contributions to open-source software; Experience working in a fully remote, distributed team. About the Wikimedia Foundation The Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects. 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. The Wikimedia Foundation is a United States 501(c)(3) tax-exempt organization with offices in San Francisco, California, USA. As an equal opportunity employer, the Wikimedia Foundation values having a diverse workforce and continuously strives to maintain an inclusive and equitable workplace. We do not discriminate against any person based upon their race, traits historically associated with race, religion, color, national origin, sex, pregnancy or related medical conditions, parental status, sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, or any other legally protected characteristics. The Wikimedia Foundation is a remote-first organization with staff members including contractors based 40+ countries
* . Salaries at the Wikimedia Foundation are set in a way that is competitive, equitable, and consistent with our values and culture. The compensation for a successful applicant will be based on their skills, experience and location. *Our non-US employees are hired through a local third party Employer of Record (EOR) and must have current work authorization in their location. (*citizens/permanent residents only) We periodically review this list to streamline to ensure alignment with our hiring requirements. If you are a qualified applicant requiring assistance or an accommodation to complete any step of the application process due to a disability, you may contact us at recruiting@wikimedia.

📌 Senior Software Engineer JS (España)
🏢 Wikimedia Foundation
📍 España