Senior Data Scientist, Safety & Security

Wikimedia Foundation; United States; Remote; USD 110,000 - 173,000; Full time

Job summary

Wikimedia Foundation is seeking a Senior Data Scientist, Safety & Security, to guide Wikipedia’s anti-abuse and security strategy. This remote role partners with product managers, engineers, and researchers to drive data-informed decisions that strengthen our platform.

The role involves developing measurement strategies, evaluating experiments with Bayesian and Frequentist methods, and building AI-driven data pipelines to support product decisions at scale.

Qualifications

• Experience with experimental design and statistics or machine learning methods.

Responsibilities

• Partner with product managers, engineers and designers to guide product decisions.
• Develop measurement strategy and analyze experiments using Bayesian and Frequentist methods.
• Instrument features and ensure data quality for A/B testing.
• Build self-service dashboards tracking product health using BI tools.
• Deliver timely, data-driven insights to stakeholders.

Skills

Statistical methods

Experimental design

Machine learning

Python

SQL

AI coding assistants

Tools

Hive

Presto

Druid

Spark

DBT

Airflow

Superset

Job description

Senior Data Scientist, Safety & Security

Remote

Summary

Wikipedia is a trusted source of knowledge the world over, read by over a billion people a month in over 300 languages. It’s offered for free and operated independently by the non-profit Wikimedia Foundation (that’s us), powered mainly by small donations.

We are hiring a Senior Data Scientist to help guide Wikipedia’s anti-abuse and security strategy as a member of our Product Analytics team. In this role, you will inform our product development strategy by collaborating with product managers, engineers, and others to help our features and interventions make the impact they should.

As the Senior Data Scientist, Safety & Security, you will partner closely with the Product Safety and Integrity team , whose strategy is built around bringing cutting‑edge AI and machine learning techniques to bear on difficult problems in the field of safety and security. You will amplify the impact of the safety and security roadmap through creative data analysis, identifying the right metrics for the job, and developing data strategies that advance our product decisions.

This role is an opportunity to be at the center of a pivotal time for Wikipedia, as AI changes how people access knowledge and presents new risks and opportunities in online safety and security.

Examples of the kinds of projects you may work on include:

• Setting the strategy for how we measure the success of efforts to detect bots and inauthentic account activity ( sockpuppetry , in wiki terms).
• Providing analysis to inform the development of new heuristics and approaches to detect potentially abusive activity on the platform.
• Collaborating with research scientists and security engineers to develop and evaluate AI models to find malicious user‑authored code.

Please note that this role requires availability for critical meetings and synchronous collaboration between 13:00 and 19:00 UTC.

You are responsible for:

• Serving as a strategic partner for product managers, engineers, designers, and other colleagues in product development teams.
• Proactively making recommendations on product direction and data strategy, surfacing insights and interpreting results.
• Timely delivery of accurate quantitative data and insights to inform strategy, guide product decisions, and assess the impact of product development work – balancing the need to operate in a fast‑changing environment with appropriate rigor.
• Clearly communicating results and data‑backed recommendations to stakeholders across different functions, ensuring understanding and guiding decision‑making.
• Building and executing measurement strategy, evaluating experiments using Bayesian & Frequentist approaches, and performing quantitative research to inform product decisions.
• Developing queries & code to work with large‑scale internal and external data repositories, using cutting‑edge AI assistants, and tools such as Apache Iceberg, Hive, Druid, Presto, and Spark.
• Building automated, self‑service dashboards for product teams that track success and health metrics using tools such as DBT, Airflow, and Superset.
• Helping product team members instrument features, perform data quality assurance, and use tools for running A/B tests.
• Demonstrating good judgment in prioritizing workload and selecting analytical methods and techniques.

Skills and Experience:

• Experience with experimental design and statistics or machine learning methods.
• Experience using AI coding assistants for data analysis and other technical tasks.
• Fluency in R or Python, and common version control and command‑line‑based tools, for data analysis, statistical modeling, simulation, visualization, & reporting.
• Fluency in SQL and working with large scale data (we use tools like Hive, Presto, Druid, and Spark).
• Experience collaborating with product development teams in a fast‑paced environment to test, analyze, and evaluate user‑facing features for an online platform.

Qualities that are important to us:

• Ability to explain data and insights clearly to non‑specialist audiences and gain their understanding and confidence.
• Curiosity and critical thinking skills; a lifelong learner who sees situations through multiple lenses.
• Empathy towards and commitment to work with the Wikimedia volunteer communities. Discretion and competence in handling sensitive or confidential data.
• Self‑motivated with an ability to navigate through ambiguity and complexity. The Wikimedia ecosystem is complex, resources are limited, and our guiding principles are ambitious. We want you to work to find solutions embracing these factors.

Additionally, we’d love it if you have:

• Prior experience working in areas related to trust & safety, information security and privacy, or fraud and anti‑abuse.
• Exposure to, and interest in, ethical data management and privacy practices.
• Contributed to Wikimedia projects or have experience working in other open source projects.
• Experience with Superset, Growthbook, or other open‑source testing, data visualization, or reporting tools.

About the Wikimedia Foundation

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. We believe that everyone has the potential to contribute something to our shared knowledge, and that everyone should be able to access that knowledge freely. 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.

The Wikimedia Foundation is a charitable, not‑for‑profit organization that relies on donations. We receive donations from millions of individuals around the world, with an average donation of about $15. We also receive donations through institutional grants and gifts. The Wikimedia Foundation is a United States 501(c)(3) tax‑exempt organization with offices in San Francisco, California, USA.

As an equal opportunity employer, the Wikimedia Foundation values having a diverse workforce and continuously strives to maintain an inclusive and equitable workplace. We encourage people with a diverse range of backgrounds to apply. 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*. Salaries at the Wikimedia Foundation are set in a way that is competitive, equitable, and consistent with our values and culture. The anticipated annual pay range of this position for applicants based within the United States is US$ 109,563 to US$ 173,129 with multiple individualized factors, including cost of living in the location, being the determinants of the offered pay. For applicants located outside of the US, the pay range will be adjusted to the country of hire. We neither ask for nor take into consideration the salary history of applicants. The compensation for a successful applicant will be based on their skills, experience and location.

*Please note that we are currently able to hire in the following:

US States: Arizona, California, Colorado, Connecticut, District of Columbia*, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico*, Rhode Island, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming (*US Territory or Federal District)

For US‑based applicants: this position is part of the Communication Workers of America bargaining unit.

Countries: Brazil, Canada, Colombia, Germany, Ghana, India, Indonesia, Italy, Kenya*, Mexico, Morocco, Netherlands, Poland, Singapore*, South Africa, Spain, Switzerland and the United Kingdom. Our non‑US employees are hired through a local third party Employer of Record (EOR) and must have current work authorization in their location. (*citizens/permanent residents only)

All applicants can reach out to their recruiter to understand more about the specific pay range for their location during the interview process.

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] or [phone].