Sr. Staff Data Scientist

About the role

Reddit seeks a Senior Staff Data Scientist to guide the scientific direction for ad measurement and signal systems. This position is crucial for demonstrating advertiser value, enhancing signal accuracy, developing privacy-conscious measurement tools, and linking ad exposure to tangible business results.

Key facts

What you'll do

• Shape the long-term data science strategy for ad measurement, signal quality, identity, attribution, and privacy.
• Develop rigorous frameworks to validate lift, attribution, identity accuracy, modeled conversions, and privacy-safe measurement.
• Advance large-scale experimentation and causal inference methodologies for various lift studies.
• Quantify the impact of signal quality, identity resolution, and privacy changes on key advertiser metrics.
• Lead the development of privacy-first measurement approaches to position Reddit as a leader in trusted advertising.
• Establish reusable methodologies, dashboards, and best practices for the Ads Data Science team.
• Collaborate with senior leaders across Product, Engineering, Sales, and Legal to influence roadmap decisions.
• Mentor other data scientists and elevate technical standards within the organization.

Requirements

• An advanced degree in a quantitative field such as Statistics, Economics, Mathematics, Computer Science, Operations Research, Physics, or equivalent professional experience.
• A minimum of 10 years of industry experience in data science, applied science, statistics, or a related quantitative discipline.
• Extensive expertise in ad measurement, experimentation, causal inference, attribution, or ad optimization.
• A proven history of leading complex, cross-functional initiatives with demonstrable business impact.
• Strong command of statistical modeling, experimental design, causal inference, and measurement principles.
• Experience defining metrics, evaluation frameworks, and decision systems for sophisticated products.
• Demonstrated ability to balance strategic long-term vision with hands-on execution of technical challenges.
• Advanced proficiency in SQL and either Python or R.
• Skill in influencing senior leaders through clear technical judgment and effective communication.
• Experience mentoring senior individual contributors and improving technical standards across a data science team.
• Demonstrated ability to AI tools to enhance personal productivity and prototype complex methodologies.

Nice to have

• Experience with ad identity, conversion modeling, signal loss recovery, or identity graph evaluation.
• Experience with lift measurement, incrementality testing, MMM, MTA, or third-party measurement partnerships.
• Experience working with privacy-constrained measurement, clean rooms, or consent-aware systems.
• Experience partnering with machine learning or ranking teams to link measurement quality to optimization outcomes.
• Familiarity with two-sided marketplaces, auction systems, or performance advertising.
• Experience building organizational frameworks, training programs, or methodology standards.

Skills & tools

• SQL
• Python or R
• Causal Inference
• Experimentation Design
• Statistical Modeling
• Ad Measurement
• Attribution

Practical notes

• Base salary range: $232,500 - $325,500 USD.
• Eligible for equity in the form of restricted stock units.
• May be eligible for commission depending on the specific role.
• Comprehensive benefits include healthcare, 401k with match, family planning support, mental health benefits, and flexible paid time off.
• Interviews may be recorded, transcribed, and summarized by AI; candidates will have the option to opt out.
• Personal information collected during interviews will be used for evaluation purposes and will not be sold or shared for marketing.
• Reddit is an equal opportunity employer and provides reasonable accommodations for individuals with disabilities.

About the company

Reddit is an American social media, forum, and news aggregation platform based in San Francisco. University of Virginia roommates Steve Huffman and Alexis Ohanian launched the site in June 2005, and Aaron Swartz joined them in November 2005. Condé Nast bought the business in October 2006. It later became an independent subsidiary of Advance Publications in 2011. Reddit debuted on the stock market under ticker symbol RDDT on March 21, 2024. The business held a market valuation of 10 billion US dollars in July 2024. Registered users post text, web links, images, and videos inside user-created boards called subreddits. Community members vote on submissions. Posts with high upvote counts rise to the top of subreddits and reach the front page. Site administration handles platform oversight, while unpaid volunteers moderate individual communities. As of December 2025, Reddit ranks among the most visited websites in the world. United States users generate 51.75 percent of traffic. Canada accounts for 7.01 percent, the United Kingdom for 6.97 percent, Australia for 3.97 percent, and Germany for 3 percent. Reddit is known for political activism alongside noticeable left-wing and anti-theist subcultures. Observers praise its system for enabling specialized interest groups. Critics point out that voting can foster online echo chambers and spread misinformation.