[Remote] Senior Machine Learning Engineer - AdTech

Note: The job is a remote job and is open to candidates in USA. Harnham is a consumer technology company with hundreds of millions of users, seeking a Senior Machine Learning Engineer to join their Ad Tech team. The role focuses on improving production machine learning systems that influence revenue and user engagement, with responsibilities including model improvement, data analysis, and collaboration with product and engineering teams.ResponsibilitiesOwn and improve production machine learning modelsAnalyze large-scale datasets containing millions of rowsImprove prediction, ranking, recommendation, and optimization systemsDesign and evaluate new features that improve model performanceRun experiments and measure business impactRetrain and evolve models as user behavior changesTranslate insights from data into production code improvementsPartner closely with Product and Engineering teams to drive revenue outcomesSkills5+ years of Machine Learning Engineering, Applied ML, or Data Science experienceStrong Python engineering skills with daily hands-on developmentStrong SQL skills including complex multi-table joins and large-scale analysisExperience working with datasets containing millions of rowsExperience building, deploying, and improving production ML modelsStrong feature engineering experienceProven ability to improve ML systems and drive measurable business impactStrong ownership and ability to operate independentlyAd Tech optimizationAd ranking or bidding systemsRecommendation enginesPersonalization systemsSearch and ranking algorithmsMarketplace optimizationUser value optimizationAWS, Snowflake, or online feature storesBenefitsAnnual bonus opportunityUnlimited PTOMedical, dental, and vision coverage401(k)Company OverviewHarnham has actively chosen to focus on Data and Analytics. It was founded in 2006, and is headquartered in New York, New York, USA, with a workforce of 201-500 employees. Its website is https://www.harnham.com/us.