Job Description

The Wikimedia Foundation is seeking a Senior Software Engineer to scale and sustain the Wikidata Query Service and related platform services. This role combines backend engineering and operations ownership, focusing on performance, reliability, and maintainability of structured data systems.

Responsibilities

• Design, build, and maintain backend systems and APIs
• Improve reliability, observability, and automation
• Collaborate with SRE, data engineers, and product teams
• Monitor production systems and resolve bottlenecks
• Support platform migrations and system upgrades
• Contribute to deployment automation and CI/CD workflows
• Participate in code reviews and design discussions
• Document systems and share knowledge

Requirements

• 5+ years of experience as a backend or platform engineer
• Deep understanding of database and knowledge graph technologies
• Proficiency in Java, C++, or other systems languages
• Experience building and operating production-grade services with SLOs
• Familiarity with observability tools
• Understanding of graph databases or data processing pipelines
• Collaborative and communication skills
• Commitment to learning and a mission-driven culture

Benefits

• No benefits