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.

Got feedback? Send it to us on Threads (https://threads.net/@metatechpod), Instagram (https://instagram.com/metatechpod) and don't forget to follow our host Pascal (https://mastodon.social/@passy, https://threads.net/@passy_). Fancy working with us? Check out https://www.metacareers.com/.

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
Advanced Monitoring and Synchronization Techniques 16:53
Advanced Power Monitoring in Wearables 21:26
Real-World Examples of Performance Optimization 23:53
Battery Life Improvements Through Engineering 25:21
Engineering Culture and Performance Mindset 27:49
Continuous Testing and Profiling Strategies 29:36
Balancing Profiling Overhead and Accuracy 32:15
Simulating Real-World Scenarios in Testing 34:27
Best Practices for Efficient Wearable Code 37:21
Outro 40:26

Det här avsnittet är hämtat från ett öppet RSS-flöde och publiceras inte av Podme. Det kan innehålla reklam.

Avsnitt(94)

BONUS: Send Us Your Questions About Engineering at Meta

Pascal is going on Recharge for August so there will be no regular interview episode. However, we want to hear your questions for our mailbag episode. Send them to us on Instagram (https://www.instagr...

29 Juli 1min

86: A Hard Cell: Engineering Ultra-Narrow Batteries for AI Glasses

Your smart glasses run all day on a battery narrower than your pinky finger and building it required reinventing how batteries are made. In this episode, Pascal talks to Karthik and Myuran, the engine...

9 Juni 42min

85: Reel Friends: Building Social Discovery that Scales to Billions

You've probably spotted those little circles of your friends' faces popping up on Facebook Reels. They look simple enough, but building them was a proper engineering challenge. In this episode, Pascal...

8 Maj 38min

84: Trust But Canary: Configuration Safety at Scale

Have you ever wondered how Meta makes config rollouts safe at scale? In this episode, Pascal sits down with Ishwari and Joe to discuss Meta's approach for propagating changes across services in second...

2 Apr 37min

83: Patch Me If You Can: AI Codemods for Secure-by-Default Android Apps

At Meta, even seemingly simple engineering tasks—like updating an API—become monumental undertakings when you're dealing with millions of lines of code and thousands of engineers, especially if the ch...

27 Feb 47min

82: CSS at Scale with StyleX

It's not just Not Invented Here Syndrome. Some technologies like CSS simply don't scale if you're building some of the largest websites on the planet with thousands of engineers committing to the same...

8 Jan 44min

81: From Zero to Polish: Building Meta Ray-Ban Display

You've likely heard of Meta Ray-Ban Display by now — but what's it actually like to work on it? In this episode, Pascal talks to Kenan and Emanuel about the exciting features of Meta's First-Gen Displ...

12 Dec 202547min