Caren Thomas
Founding Engineer at Letta
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolCaren Thomas is a founding engineer and seasoned software leader with 11 years of experience building scalable backend systems and privacy-conscious infrastructure. Based in San Francisco, she led major messaging and privacy initiatives at Meta—shipping Meta AI on Instagram, integrating E2EE, and scaling broadcast chats to a million users—while driving company-wide regulatory readiness through the Privacy Aware Infrastructure program. Her hands-on strengths span backend architecture, cross-product infra unification for cross-app messaging, and launching high-impact features that moved millions of daily users. An active open-source contributor, she refactored core stats and telemetry in Facebook’s widely used FBOSS codebase to simplify locking and make components more open-source friendly. Now at Letta, she pairs startup founding grit with deep product and systems experience to deliver pragmatic, auditable solutions.
11 years of coding experience
10 years of employment as a software developer
Bachelor's degree Computer Science, Bachelor's degree Computer Science at University of California, Berkeley
Github Skills (11)
locking10
locks10
c-language10
refactoring10
cprogramming-language10
networking10
system-design9
data-structure9
data-structures9
multithreading8
performance-optimization8
Programming languages (5)
Github contributions (5)
facebook/fboss
Jun 2016 - Aug 2016
Facebook Open Switching System
Software for controlling network switches.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits in 1 month
Contributions summary:Caren's primary focus was on refactoring and improving the internal stats tracking and reporting mechanisms within the Facebook Open Switching System. Their work involved replacing legacy classes like `LockAndStatItem` and `LockAndHistogram` with newer, more streamlined counterparts (`LockableStat` and `LockableHistogram`) using `folly/Synchronized` for locking. This refactoring effort extended to the `ExportedStatMap` and `ExportedHistogramMap` classes, aiming to simplify dependencies and facilitate potential open-sourcing. Additionally, the user renamed methods to improve clarity and made updates to integrate these changes across the project.
facebookcontrollingswitchingsystem-softwareswitches
letta-ai/letta-python
Dec 2024 - Mar 2025
A Python SDK for accessing the Letta API
Contributions:2 reviews, 16 PRs, 37 pushes in 3 months
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