Staff ML Engineer — AI Security, Model Dev (Remote)

Remote; San Francisco (CA); Remote; USD 220,000 - 320,000; Full time

Benefits offered by this job

Comprehensive Healthcare Benefits and

401k with Employer Match

Global Benefit programs that fit your

Family Planning Support

Gender‑Affirming Care

Mental Health & Coaching Benefits

Flexible Vacation & Paid VolunteerTime

Generous Paid Parental Leave

Job summary

Reddit's AI Security team within Security Platform Engineering is seeking a founding Staff Machine Learning Engineer to lead development, training, and optimization of models for AI security across Reddit products and infrastructure. This role blends deep ownership of model architecture with hands-on experimentation and technical leadership.

You will shape a multi-quarter roadmap, build robust training pipelines, improve robustness, and drive responsible ML practices while delivering a safe,

Qualifications

• 8+ years of hands-on ML model development with production impact.
• Strong Python programming and DL framework experience.
• Experience with scalable data pipelines and distributed training.
• Ability to mentor engineers and lead technical discussions.
• Excellent written and verbal communication about model behavior and risk.

Responsibilities

• Select, adapt, fine-tune, evaluate, and deploy pretrained models for Reddit security.
• Build reproducible training/evaluation pipelines on Reddit's ML platform.
• Set technical vision and modeling roadmap with cross-functional teams.
• Conduct model evaluations to improve accuracy and robustness.
• Own training-data quality and production model lifecycle.
• Establish best practices for responsible ML development.
• Stay current with NLP/LLMs and translate advances into improvements.
• Mentor engineers and lead technical reviews.

Skills

Python programming

Software engineering

Deep learning frameworks

TensorFlow

PyTorch

Hugging Face Transformers

Model training and evaluation

Adversarial robustness

Leadership / mentorship

Tools

Ray Train

PyTorch Distributed

ML pipelines

Job description

Reddit's AI Security team within Security Platform Engineering is seeking a founding Staff Machine Learning Engineer to lead development, training, and optimization of models for AI security across Reddit products and infrastructure. This role blends deep ownership of model architecture with hands-on experimentation and technical leadership.

You will shape a multi-quarter roadmap, build robust training pipelines, improve robustness, and drive responsible ML practices while delivering a safe,