Senior Software Engineer, Core

• Deliver medium complexity initiatives from technical discovery through delivery
• Create mobile Wikipedia product experiences for a global, multilingual audience across web and app surfaces
• Create RESTful APIs and scalable data pipelines to serve mobile and web client experiences
• Build software that is easy to test, observe, and debug
• Partner with product managers, designers, analysts, and native app engineers to shape pragmatic solutions
• Identify high-impact technical opportunities and risks and align the team on outcomes and capacity
• Comply with team standards in code review, technical design, testing, and documentation

• Bachelor's and 5-10+ years related professional experience with significant experience building production web applications and services
• Strong professional experience with JavaScript/Type Script, JavaScript frameworks such as Vue.js, and backend languages such as PHP
• Experience building responsive or mobile-first web experiences with attention to performance, accessibility, and usability
• Experience in designing and integrating with server-side APIs
• Experience delivering in a self-driven, lean environment
• Commitment to the Foundation's Mission and Values

• Experience adding webview-wrapped experiences to existing native mobile apps
• Experience launching and maintaining native or cross-platform mobile applications
• Experience building mobile games or interactive mobile experiences
• Experience with data science, machine learning, and/or AI
• Familiarity with Wikipedia, wikitext, markdown editing, or content management systems
• Experience leveraging agentic coding to scale engineering teams
• History of open source contributions
• Experience working in a fully remote, distributed team

The Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects. Our vision is a world in which every single human can freely share in the sum of all knowledge.