Staff ML Engineer, AI Security & Guardrails

Society for AI Security; United States; On-site; USD 210,000 - 290,000; Full time

Benefits offered by this job

Comprehensive Healthcare Benefits and 

Income Replacement Programs

401k with Employer Match

Global Benefit programs that fit your 

Family Planning Support

Mental Health & Coaching Benefits

Job summary

Reddit is seeking a founding Staff Machine Learning Engineer to lead the development, training, and optimization of AI security models. You will own model architecture, training data, and experimentation, while providing technical leadership across teams and shaping the long-term ML strategy.

You will build scalable ML systems to detect prompt injection, jailbreaks, data exposure, and unsafe AI behavior, contributing to robust security across Reddit products and platforms.

Qualifications

• 8+ years of experience developing machine learning models with hands-on model training and production impact.
• Strong Python programming and deep learning frameworks experience (TensorFlow, PyTorch, Transformers).
• Experience with scalable data pipelines and distributed training (Ray Train, PyTorch Distributed).

Responsibilities

• Select, adapt, fine-tune, evaluate, and deploy pretrained models and lightweight classifiers for Reddit-specific security problems.
• Build reproducible training/evaluation pipelines on Reddit’s ML platform and improve inference performance.

Skills

Python programming

Software engineering

Deep learning frameworks

TensorFlow

PyTorch

Hugging Face Transformers

Tools

Ray Train

PyTorch Distributed

Job description

Reddit is seeking a founding Staff Machine Learning Engineer to lead the development, training, and optimization of AI security models. You will own model architecture, training data, and experimentation, while providing technical leadership across teams and shaping the long-term ML strategy.

You will build scalable ML systems to detect prompt injection, jailbreaks, data exposure, and unsafe AI behavior, contributing to robust security across Reddit products and platforms.