[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.

Responsibilities

• Production machine learning models that drive optimization, prediction, and ranking systems
• Ongoing model performance analysis and identification of improvement opportunities
• Feature engineering, model tuning, and architecture refinement
• Experimentation frameworks and measurement of business impact
• Translation of data insights into production-ready model improvements
• Continuous model retraining and adaptation to evolving user behavior

Skills

• 5+ years of experience in Machine Learning Engineering, Applied ML, or Data Science
• Strong Python skills with regular hands-on development
• Advanced SQL, including complex joins across large datasets
• Experience working with high-volume data (millions of rows across multiple datasets)
• Proven ability to build, deploy, and improve production ML models
• Strong understanding of feature engineering and model performance optimization
• Experience writing production-quality code (testing, reviews, documentation)
• Ability to operate independently and own technical decisions
• Demonstrated track record of delivering measurable business impact
• Experience with recommendation systems, ranking, personalization, or optimization models
• Exposure to advertising systems, bidding, or user value modeling
• Familiarity with modern data platforms and feature stores
• Experience working in high-scale consumer or marketplace environments

Company Overview

Company H1B Sponsorship