Senior Machine Learning Engineer, Ads Foundational Representations
Core
Building semantic, contextual, and behavioral representations (embeddings) for Reddit's core entities (ads, posts, users) to power the Ads Delivery funnel, targeting, and business insights.
Role type
Senior IC machine learning engineer (ads representations)
Builds
Production embedding models, data processing/inference pipelines, and LLM/VLM-based representations for ad relevance and targeting.
Domain
Internet / Advertising / Machine Learning
Deliverable
production ML models
Required skills
Full lifecycle ML model design, training, evaluation, and deployment; NLP and computer vision model building; complex feature/embedding development for downstream models; mainstream deep learning frameworks (PyTorch or TensorFlow)
Preferred skills
Ads domain knowledge; Search/Recommender systems experience; Tech leadership and mentoring; Hands-on LLM/VLM fine-tuning and usage
Technologies
Python, PyTorch, Airflow, BigQuery, Ray, Kubernetes, Kafka, GCP
Responsibilities
Develop and iterate embedding models for advertising use cases; Work with LLMs/VLMs to extract representations and fine-tune models; Build data processing and inference pipelines; Conduct end-to-end experimentation and evaluation of features; Ensure reliability, scalability, and performance of ML systems; Participate in modeling and coding reviews; Collaborate with cross-functional teams on requirements and solutions
Seniority
Senior, hands-on IC
