Senior Principal ML Engineer — Ads Optimization (Hybrid/Remote)

PubMatic; Minnesota; Hybrid; USD 260,000 - 330,000; Full time

Benefits offered by this job

Health insurance

Commuter benefits

Wellness programs

DTO leave

Job summary

PubMatic, a leading AI-powered ad tech company, is seeking a Senior Principal Machine Learning Engineer to build next-generation performance optimization for the Activate platform. You will apply ML, prediction, ranking, calibration, experimentation, and optimization techniques to improve campaign outcomes across CTR, CPA, ROAS, and other metrics.

The role emphasizes production ML systems, model monitoring, online/offline evaluation, and collaboration with engineers, product, analytics, and

Qualifications

• Experience building large-scale production ML/optimization systems.
• Strong ML fundamentals including ranking, calibration, experimentation, and evaluation.
• Experience with CTR/CVR prediction, bid optimization, value modeling, forecasting, calibration, or performance optimization.
• Ability to reason about model quality, business impact, and production tradeoffs.

Responsibilities

• Build and improve ML models for campaign optimization, prediction, ranking, bidding, forecasting, and calibration.
• Develop algorithms that balance spend delivery, cost efficiency, goals, and marketplace dynamics.
• Work on large-scale ML systems using signals from auctions, impressions, clicks, video events, conversions, and user data.
• Design and improve CTR, CVR, VCR, CPA, ROAS, app-install, and campaign-performance models.
• Develop bidding, pacing-aware optimization, ranking, exploration, and value-estimation approaches.
• Improve model calibration, online/offline evaluation, experimentation, observability, and production feedback loops.
• Collaborate with signal engineers to define features, labels, attribution windows, and training data.

Skills

10+ years prod ML/optimization

Python

Java

SQL

Spark

TensorFlow

PyTorch

XGBoost

Model evaluation

Distributed ML workflows

Education

BS/MS/PhD in CS/ML/Math/Engineering

Tools

TensorFlow

PyTorch

XGBoost

Spark

SQL

Python

Job description

PubMatic, a leading AI-powered ad tech company, is seeking a Senior Principal Machine Learning Engineer to build next-generation performance optimization for the Activate platform. You will apply ML, prediction, ranking, calibration, experimentation, and optimization techniques to improve campaign outcomes across CTR, CPA, ROAS, and other metrics.

The role emphasizes production ML systems, model monitoring, online/offline evaluation, and collaboration with engineers, product, analytics, and