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Principal Machine Learning Infrastructure Engineer, Ads & Discovery
Principal ML Infrastructure Engineer at Roblox builds and scales the machine learning systems that power ads and discovery for hundreds of millions of users, using large-scale training, inference, and feature pipelines.
Principal Machine Learning Engineer, Alt Defense
Technical lead for Roblox's Alt Defense pod, architecting large-scale ML systems (graph neural networks, clustering) that detect banned bad actors returning with alternate accounts across billions of accounts, in near real time. Onsite in San Mateo, working with Python-scale ML, big data, and low-latency serving.
Principal Machine Learning Platform Engineer, Foundation AI
Principal engineer who owns Roblox's internal ML platform as a product — building serving layers, model registries, pipeline orchestrators, and training/inference control planes exposed via APIs, SDKs, CLIs, and UIs. Blends backend engineering, developer experience, and large-scale GPU infrastructure work.
Senior Principal Engineer, Data & Machine Learning
Senior principal-level individual contributor serving as chief architect for PlayStation's Data & Intelligence organization, setting multi-year architecture and standards for data products, ML systems, real-time activation, and generative AI while staying hands-on. Requires deep distributed systems, cloud, data/ML platform and governance expertise at massive consumer scale.
Principal Machine Learning Engineer
Zscaler (NASDAQ: ZS) accelerates digital transformation so customers can be more agile, efficient, resilient, and secure. The Zscaler Zero Trust Exchange platform protects thousands of customers from cyberattacks and…
Principal Machine Learning Engineer (EO/IR Image Analysis)
Principal ML Engineer at Rocket Lab's Optical Systems division in Long Beach, CA, building deep learning neural networks and ML pipelines for EO/IR image processing in support of U.S. Space Development Agency defense programs. Daily work spans model design, training, validation, and deployment using Python and frameworks like PyTorch, TensorFlow, and Keras.
Principal Machine Learning Engineer (EO/IR Image Analysis)
Rocket Lab's Optical Systems division in Tucson, AZ is hiring a Principal ML Engineer to build deep learning neural networks for EO/IR satellite image processing, supporting the U.S. Space Development Agency's PWSA Tranche 3. Day to day: design, train, and deploy computer vision models (detection, segmentation, tracking) and maintain ML pipelines using Python and frameworks like PyTorch/TensorFlow
Principal Machine Learning Engineer
Principal Machine Learning Engineer at Axon designs and deploys AI models for edge devices, focusing on counter-UAS technology with privacy-preserving, real-time systems.
Principal Research Scientist - Machine Learning
Lead IMC’s long-term ML research agenda, translating cutting-edge academic advances into practical trading applications and mentoring researchers.
AI Principal Machine Learning Engineer
A principal-level machine learning engineer role in the US, technically leading the design and delivery of AI-powered networking platforms — spanning RAG, AI agents, LLM fine-tuning, anomaly detection and real-time inference — using Python, FastAPI, Docker/Kubernetes, NVIDIA Triton/TensorRT and cloud infrastructure, while mentoring engineers and steering architecture.
Principal Machine Learning Engineer
Principal ML engineer on Atlassian's DevAI team, building AI features for developer products via LLM integration and prompt engineering. Day to day: designing LLM-based algorithms, data preprocessing/feature engineering, running experiments, and implementing and monitoring ML pipelines.
Principal, Machine Learning Engineer
Lead machine learning initiatives to improve Coupang’s e-commerce search and recommendation systems using advanced algorithms, ML/DL, and large language models.
Principal Machine Learning Engineer, Causal Decisioning
Principal-level technical leader for DoorDash's Causal ML pod in New Verticals (grocery, convenience, retail): sets multi-year causal ML strategy, defines a company-level causal value metric, and builds production causal decisioning systems (treatment effect estimation, counterfactual policy evaluation, surrogate metrics) connecting experiments, observational data, and ML for promotions, ranking,
Principal Machine Learning Engineer, Ads & Promos Delivery
Lead AI-driven ranking and relevance systems for DoorDash’s ads marketplace, designing and deploying ML/LLM models to personalize ad delivery in real time across global markets.
Principal Engineer, AI/ML Security
Leads DigitalOcean's AI/ML security: owns the AI security strategy and multi-year roadmap, builds in-house ML guardrails and security tooling, runs AI red-teaming and threat modeling across the ML lifecycle, and owns AI risk & governance. Core stack: Python, Go, adversarial ML, LLM/RAG security, MITRE ATLAS and NIST AI RMF.
Principal Machine Learning Engineer
A senior individual-contributor role at ZoomInfo (no direct reports) that sets the technical strategy for the intelligence layer its AI agents reason over — the data graph, entity resolution, and buying-intent signals — staying hands-on with classical ML, statistics, and LLM systems built in production Python and SQL.