Responsibilities
Design and deliver improvements to Wikipedia’s wikitext processing infrastructure while balancing user experience, performance, backward compatibility, and maintainability.
Develop new features collaboratively with engineers, product managers, designers, client teams, and community members.
Write PHP and JavaScript supporting hundreds of world languages.
Create and maintain internet APIs using server scripting languages.
Instrument components to monitor feature and quality characteristics.
Use caching and persistence technologies.
Own complex technical projects from problem definition through implementation and delivery, including architectural decisions.
Mentor engineers and raise team technical quality through code reviews, design discussions, documentation, or direct mentorship.
Requirements
At least five years of related professional software engineering experience.
Experience with parser generators, interpreters, language runtimes, compilers, or taking language features through a product cycle.
Experience designing and maintaining reliable,



performant software used by other teams, products, or large user populations.
Ability to own complex technical projects, resolve dependencies, navigate ambiguity, and work with limited direction.
Strong unit and integration testing practices and ability to address security and code review feedback.
Ability to collaborate effectively across team and organizational boundaries and communicate clearly in synchronous and asynchronous channels.
Experience mentoring other engineers.
Bachelor’s, master’s, or doctorate degree in computer science, software engineering, or another STEM field, or equivalent certification.
Familiarity with HTML5 and DOM manipulation is preferred.
Expertise in Node.js and related technologies is preferred.
Familiarity with Wikipedia, wikitext, Markdown, MediaWiki, Drupal, WordPress, or other content management systems is preferred.
Open source contribution experience is preferred.
Benefit

📌 Senior Software Engineer (España)
🏢 Wikimedia Foundation
📍 España