[Remote] Senior Machine Learning Engineer - Ad Tech

Note: The job is a remote job and is open to candidates in USA. Harnham is partnering with a large-scale consumer platform to find a Senior Machine Learning Engineer who will take ownership of critical optimization systems that directly influence user experience and revenue. This high-impact role focuses on improving production machine learning models that drive optimization, prediction, and ranking systems, allowing for measurable business outcomes.ResponsibilitiesProduction machine learning models that drive optimization, prediction, and ranking systemsOngoing model performance analysis and identification of improvement opportunitiesFeature engineering, model tuning, and architecture refinementExperimentation frameworks and measurement of business impactTranslation of data insights into production-ready model improvementsContinuous model retraining and adaptation to evolving user behaviorSkills5+ years of experience in Machine Learning Engineering, Applied ML, or Data ScienceStrong Python skills with regular hands-on developmentAdvanced SQL, including complex joins across large datasetsExperience working with high-volume data (millions of rows across multiple datasets)Proven ability to build, deploy, and improve production ML modelsStrong understanding of feature engineering and model performance optimizationExperience writing production-quality code (testing, reviews, documentation)Ability to operate independently and own technical decisionsDemonstrated track record of delivering measurable business impactExperience with recommendation systems, ranking, personalization, or optimization modelsExposure to advertising systems, bidding, or user value modelingFamiliarity with modern data platforms and feature storesExperience working in high-scale consumer or marketplace environmentsCompany 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.Company H1B SponsorshipHarnham has a track record of offering H1B sponsorships, with 1 in 2024. Please note that this does not guarantee sponsorship for this specific role.