Senior Software Development Engineer - Backend / JavaScript

Senior Software Engineer, MediaWiki

The Wikimedia Foundation is looking for a Senior Software Engineer to join the MediaWiki Platform team. MediaWiki is the open-source platform that powers Wikipedia and its sister projects - impacting hundreds of millions of Wikipedia users across the globe.

It focuses on performance, reliability and scalability, helping to ensure broad and equitable access to free knowledge.

As a Senior Engineer, you will not only write robust code but also lead by example, prioritize high-impact work, support better decision-making through metrics and observability and foster a culture of accountability, transparency, and continuous improvement.

Important: We are a fully remote team. Comfortably and autonomously creating proofs of concept, writing design documents, and breaking down complex projects into actionable tasks to support less experienced team members;

Coaching and mentoring teammates to support continuous growth and confidence in both technical and interpersonal skills.

Extensive experience in backend software engineering;

Experience with databases and event streams, including schema design, query optimization, and efficient data access patterns;

Deep understanding of software architecture, testing methodologies, and system design;

Familiarity with incident response, root cause analysis, and follow-up processes;

Additionally, we’d love it if you have:

Proficiency in PHP and JavaScript;

Prior experience with MediaWiki or Wikimedia projects;

Contributions to open-source software;

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. 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.

We do not discriminate against any person based upon their race, traits historically associated with race, religion, color, national origin, sex, pregnancy or related medical conditions, parental status, sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, or any other legally protected characteristics.

The Wikimedia Foundation is a remote-first organization with staff members including contractors based 40+ countries * . If you are a qualified applicant requiring assistance or an accommodation to complete any step of the application process due to a disability, you may contact us at E-Mail auf arbeitnow.com ansehen.