Wikimedia Foundation seeks a Senior Software Engineer, iOS on a 3-month full-time contract to work on the App Growth team. Responsibilities include delivering medium-complexity initiatives end-to-end, system design, improving the iOS Wikipedia app, instrumentation for observability, and cross-functional collaboration. Requires a bachelor's degree and 5+ years professional experience building iOS apps with strong proficiency in Swift, SwiftUI, and UIKit. Role is fully remote but requires at least four hours of each workday between 14:00 and 21:00 UTC. Hiring is currently open in a specified list of countries.

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.

Lead analytics and measurement work for Wikimedia's anti-abuse, safety, and security efforts. Responsibilities include designing experiments and metrics, performing quantitative research using Bayesian and frequentist approaches, collaborating with product, research, and engineering teams to develop and evaluate AI/ML models, building self-service dashboards, and working with large-scale data using tools such as Hive, Presto, Druid, Spark, Apache Iceberg, DBT, Airflow, and Superset. Fluency in Python or R, SQL, and experience with experimental design, statistics, and machine learning are emphasized.

The role manages end-to-end procurement activities (vendor sourcing, onboarding, purchase orders, contract and SOW review), leads competitive sourcing (RFP/RFQ/RFI), negotiates commercial terms, supports invoice/PO issue resolution with Accounts Payable, and drives procurement process and system improvements. Requires a bachelor’s degree or equivalent and a minimum of 5+ years of progressive procurement, sourcing, and contract drafting experience.

Remote-first role leading teams of Test Engineers and Technical Writers to deliver automated test suites, manual testing, and technical documentation across Wikimedia engineering teams. Requires technical leadership, hands-on experience with languages such as Go/Python/PHP, and experience managing distributed, multicultural teams.

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.

The Wikimedia Foundation seeks an experienced Lead Learning Experience Designer to design, prototype, and evaluate digital learning experiences (courses, multimedia, embedded guidance, AI-enabled support) for a global volunteer audience. The role partners with product teams, researchers, subject matter experts, and communities to identify learner needs, apply learning science and user-centered design, use LMS tools (WikiLearn) and authoring/multimedia tools, and measure learning effectiveness. This is a remote, senior role focused on accessibility, inclusion, and scalable learning solutions.

The Wikimedia Foundation Legal Fellowship (Spring) is an 18-week, remote fixed-term placement for current law students or recent law graduates. Fellows work on supervised projects including legal research, drafting licensing agreements, policy development, and compliance topics across internet law, copyright, freedom of expression, intellectual property, privacy and data security. Candidates with coursework or experience in these areas, experience with wikis or large online communities, strong research and writing skills, and interest in free culture/open source issues are preferred. The listing includes an anticipated hourly pay range for US applicants; hiring is presently limited to specific US states and a set of named countries.

The role leads product security strategy and priorities for a security-focused engineering team, partners with cross-functional teams (design, data science, community managers), communicates with volunteers and communities, and stays current on online security and privacy practices including AI-based security analysis. Requires at least 7 years building products with 2+ years in a security-focused role.

Lead executive communications for the Wikimedia Foundation CEO and other senior leaders: provide strategic counsel, develop speeches, talking points, briefing documents and social content; build thought leadership platforms; coordinate with media relations and internal communications; prepare executives for media and public speaking; manage crisis communications; and work remotely with hours aligned to Eastern Time. Requires 10+ years communications experience, including supporting C-level executives.

The Wikimedia Foundation seeks a Head of Marketing to build and lead a new product marketing function and unify it with integrated and brand marketing. Responsibilities include team leadership, go-to-market strategy, multichannel campaign planning (paid, owned, earned), martech and CRM oversight, and measurement of audience growth and retention. This is a remote, senior role open to candidates across UTC+2 to UTC-4 and specifies 12+ years of marketing experience (including at least 5 years in B2C product marketing).

The Wikimedia Foundation seeks a Lead Product Partnerships Manager for a 12-month contract (full-time, remote) to identify and secure product and technology partnerships, design attribution pilots, manage partnership artifacts (LOIs/MOUs, CRM, pitch decks), and represent the organization at industry events. The role requires strong existing connections in the tech/media ecosystem, technical fluency for product integrations, and experience managing multi-stakeholder partnership programs.