The Wikimedia Foundation seeks a Senior Software (full-stack) Engineer on a 3-month full-time contract to build web-first product experiences, reusable components, and RESTful APIs that serve mobile and web surfaces. Responsibilities include end-to-end delivery, frontend and backend implementation, testing and observability, and cross-functional collaboration. Required: bachelor's degree and 5+ years' professional experience, strong JavaScript/TypeScript and Vue.js experience, backend experience (PHP), responsive/mobile-first development, accessibility, and API design. The role is remote with hiring available in a specified list of countries (including the United States) and expects a defined hourly overlap with UTC time.

The Wikimedia Foundation seeks a Senior Software Engineer for the MediaWiki Content Platform team to work remotely on wikitext processing, rendering and transformation services. Responsibilities include designing and implementing improvements to wikitext infrastructure, writing PHP and JavaScript, creating and maintaining internet APIs, instrumenting components, and leveraging caching and persistence technologies. The role requires 5+ years of professional software engineering experience and experience with parser/compilers or language runtimes, building reliable performant components, strong testing and engineering practices, and cross-team collaboration. Preferred timezone is GMT-4 to GMT+2. A US annual pay range (for US-based applicants) of USD 116,633–181,243 is provided; Wikimedia lists a set of non-US countries where it can hire.