Sr Principal Architect : Ads Platform

About the role

Microsoft Advertising makes billions of decisions every day across search, native, shopping, display, audience, and AI-powered advertising experiences. We are looking for a Principal Software Architect to define the technical direction for Ads Quality at global scale. Quality decisions can depend on ads, landing pages, advertisers, businesses, account history, behavioral patterns, and signals that may be incomplete, delayed, noisy, or changing.

What you'll do

• Define the long-term architecture for Ads Quality across signals, entity understanding, model execution, decisioning, feedback, and measurement
• Establish how quality systems should reason across ads, landing pages, advertisers, businesses, relationships, and behavior over time
• Design architectures that support heterogeneous AI systems including lightweight models, multimodal models, LLMs, agents, and deterministic systems
• Define how evidence, model outputs, confidence, calibration, thresholds, and decision policies come together in production
• Set technical direction across real-time, nearline, and offline systems, balancing quality, latency, freshness, cost, and reliability

What you need

• 15–27 yrs of experience
• Machine learning
• LLMs
• Any graduate