87: Everything is Power: Battery Life Engineering for AI Glasses

What changes for you as a developer when the device moves from your pocket to your face? The battery shrinks by an order of magnitude, the thermal budget is whatever won't make your nose uncomfortable, and your mental model of "one process, one device" goes out the window.

Rey and Dmitrii talk us through their custom power monitors, how they've extended Perfetto to give a coherent trace across a multi-device system, why robotic arms make surprisingly good QA engineers, and what it takes to catch the kind of regression that quietly costs you thirty minutes of call time. All of this and more is discussed in this episode.

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Links

Migrating Data Ingestion Systems at Meta Scale: https://engineering.fb.com/2026/05/12/data-infrastructure/migrating-data-ingestion-systems-at-meta-scale/

Timestamps

Intro 0:05

Introduction and Setup 1:51

Battery Life Optimization in AI Glasses 1:57

Challenges in Testing and CI Architecture 5:37

Detecting and Managing Power Regression 8:27

Developer Tools and Best Practices 13:04