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Principal Data Scientist (Remote - US) at Jobgether. This position is posted by Jobgether on behalf of Applecart. We are currently looking for a Principal Data Scientist in United States.. This is an exciting opportunity for an experienced data scientist to shape the future of audience measurement and targeting in digital advertising. You will lead the design and implementation of machine learning and statistical models that drive campaign performance and strategic decision-making. Working within a high-impact team, your insights will directly influence how top brands and organizations reach the decision makers who matter most. This hybrid role offers a balance of in-office collaboration and remote flexibility, ideal for a seasoned expert ready to lead innovative solutions at scale.. . Accountabilities:. . Design and implement advanced audience measurement metrics leveraging ML algorithms, surveys, and experimental data.. . Lead the development of predictive models for audience targeting and campaign optimization across digital and social platforms.. . Collaborate closely with engineering to deploy scalable solutions within production systems.. . Ensure data quality and model robustness through comprehensive testing and validation.. . Communicate complex analytical findings clearly to stakeholders across technical and non-technical teams.. . Drive survey-based research methodologies to inform measurement strategy.. . . 7+ years of experience in data science, with a strong focus on digital advertising and predictive modeling.. . Proven track record of building reach metrics and deploying models for campaign planning and evaluation.. . Deep knowledge of machine learning, statistics, and data science methodologies.. . Proficiency in Python (or R) and SQL.. . Degree in a quantitative field; an advanced degree is a plus.. . Excellent communication and collaboration skills with a pragmatic, solution-oriented mindset.. . Bonus: Experience with Spark, survey research, Snowflake, Databricks, AWS or GCP.. . Company Location: United States.