Reddit, Inc.

Machine Learning Engineer

• Develop advanced ML models and agentic workflows that help teams design, train, evaluate, and improve them
• Use Claude, Cursor, and comparable AI-assisted development systems to investigate model behavior, generate and test hypotheses, automate repetitive analysis, and improve code and experiments
• Build reliable loops for data and label analysis, feature and embedding development, architecture comparison, hyperparameter optimization, error analysis, and experiment readouts
• Design evaluation harnesses measuring model outcomes and agent/workflow quality, including correctness, reproducibility, regressions, cost, and latency
• Partner with product, data science, ML infrastructure, and engineering teams to connect modeling improvements to user and business outcomes
• Set technical direction across teams, mentor engineers, and raise the bar for modeling rigor and AI-assisted engineering

Senior Staff Machine Learning Engineer, Ads Ranking

AI Engineer

• Select, adapt, fine-tune, evaluate, and deploy pretrained models and lightweight classifiers for Reddit-specific security problems
• Build reproducible training and evaluation pipelines on Reddit’s ML platform
• Partner with platform engineers to improve inference performance, resource efficiency, and operational reliability
• Set the technical vision and multi-quarter modeling roadmap
• Gather requirements, define model architectures, and iterate on model development with cross-functional teams
• Conduct model evaluations and performance analysis to improve accuracy and adversarial robustness
• Define launch criteria balancing false positives, latency, throughput, reliability, and cost
• Own training-data quality and the production model lifecycle
• Use monitoring, incident findings, and red-team feedback to guide dataset improvements, retraining, and safe rollout or rollback
• Establish best practices for responsible ML development and deployment, including reproducible experiments, testing, model and data lineage, and privacy-aware data use
• Stay current with research in NLP, large language models, and relevant multimodal techniques
• Mentor engineers and lead technical discussions and reviews

Senior Staff Machine Learning Engineer, Ads Ranking

Staff Machine Learning Engineer, AI Security