The Wikimedia Foundation seeks a Senior Software Engineer to design and deliver improvements to wikitext processing infrastructure, write PHP and JavaScript, build and maintain internet APIs, and instrument components. Role is remote (preferred timezone GMT-4 to GMT+2), requires 5+ years of experience, and familiarity with parser/compiler concepts, performance, and large-scale, user-facing systems.

Wikimedia Foundation seeks a Software Engineer III to develop and maintain tools for detecting and mitigating abuse across Wikimedia projects. The mostly-remote role prefers candidates in UTC–UTC+3, requires 1+ years' professional experience, and emphasizes PHP/JavaScript, relational databases, security principles, observability, and collaboration with product, design, and research teams. The listing includes a US salary range and lists multiple countries where hiring is currently supported.

The Wikimedia Foundation seeks a remote Software Engineer to design, build, and operate backend systems and APIs for the Wikidata Query Service and related platform services. The role emphasizes production-grade service development, reliability, observability, CI/CD and incident response; requires 2+ years of relevant backend or platform engineering experience and timezone overlap with UTC+1 to UTC-5.

The Wikimedia Foundation seeks a Senior Software Engineer to design, build, and maintain backend systems and APIs for the Wikidata Platform, improve reliability and observability of WDQS and data pipelines, and participate in operational incident response and migrations. Requires 5+ years working on backend or platform engineering for distributed systems or data platforms and proficiency with systems languages (e.g., Java, C++). The role is fully remote with required working-hour overlap across UTC+1 to UTC-5.