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 general 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. Important : We are a fully remote team. 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. A commitment to learning, resilience, and contributing to a mission-driven engineering culture

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 remote-first organization with staff members including contractors based 40+ countries * .

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