Summary The Wikimedia Foundation is seeking a Senior Software Engineer to join the team supporting the Wikidata Platform — the structured data backbone of Wikimedia projects and a key part of the integral open knowledge ecosystem. You’ll help scale and sustain the Wikidata Query Service (WDQS) and related platform services that power tools, features, communities, and research efforts across Wikimedia projects and beyond. This role combines backend engineering and operations ownership. You’ll implement high-scale, production-grade services while ensuring performance, reliability, and maintainability. Working closely with the technical and product leads, you’ll contribute to shaping the future of how the world queries and interacts with structured, linked data. Important : We are a fully remote team. Improve reliability, observability, and automation of the Wikidata Query Service and data pipelines Integrate Wikidata Platform services with other systems and data sources across Wikimedia Collaborate with SRE, data engineers, and product teams to ensure stability and scalability under growing usage Support platform migrations and system upgrades (e.g., 5+ years of experience as a backend or platform engineer working on distributed systems or data platforms ~ Proficiency in Java, C++, or other systems languages. Experience in data processing systems such as graph databases, search indexes,



or data processing pipelines ~ Familiarity with streaming data systems (e.g., 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. 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
* . 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 (España)
🏢 Wikimedia Foundation
📍 España