Senior Machine Learning Engineer (AdTech)

Description: Join Sigma Software as a Senior Machine Learning Engineer to build advanced predictive systems for the programmatic advertising ecosystem. Work on production-grade machine learning models, real-time optimization pipelines, and scalable infrastructure for a live ad exchange platform. Fully remote position with flexible collaboration across distributed teams. Requirements: 6+ years of experience in Data Science and ML Engineering, with at least 2 years in each area. Strong production experience with machine learning systems that deliver measurable business impact. Expertise in gradient-boosted trees (XGBoost, LightGBM, CatBoost) and advanced knowledge in areas like delayed labels and off-policy evaluation. Proficient in Python and SQL, with hands-on experience in ML orchestration and CI/CD pipelines. Experience with Kubernetes and Docker in production environments. Upper-Intermediate or higher English level. Benefits: Opportunity to work on complex ML challenges with measurable business impact. Contribute to a modern, high-load AdTech platform with a dedicated team.