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Staff Machine Learning Engineer, AI Security

Remote - United States

$230,000 - $322,000 a year

RemoteData and AISenior

Source checked 9 hours ago.

Posted 12 days ago.

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Reddit is a community of communities.
It's built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet.
Every day, Reddit users submit, vote, and comment on the topics they care most about.
With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet's largest sources of information.
For more information, visit www.redditinc.com .
The AI Security team within Reddit's Security Platform Engineering organization builds security into Reddit's products, engineering systems, AI platforms, and operational infrastructure so the secure path is the easiest path for both people and agents.
A core part of this work is developing practical, high-quality machine learning systems that detect and prevent risks such as prompt injection, jailbreaks, sensitive data exposure, and unsafe or unauthorized AI behavior.
Building on Reddit's centralized LLM Guardrails Platform, which provides a shared security and safety boundary across major products, we are expanding ML-powered protections as Reddit's AI systems and threat landscape evolve.
We are looking for a founding Staff Machine Learning Engineer to lead the development, training, and optimization of models for AI security at Reddit.
This is a strategic and hands-on individual contributor role, combining deep ownership of model architecture, training data, and experimentation with technical leadership across teams.
You will help Reddit deliver stronger AI protections while preserving a high-quality product experience.

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