Principal Machine Learning Engineer

The role

Lead the development and rollout of advanced machine learning models that solve business problems. Mentor junior data science team members and drive strategic AI and data science initiatives.

What you will do

• Architect, implement, and evaluate advanced machine learning models and technical solutions aligned with business objectives
• Guide and support data science team members through project direction, technical best practices, and professional development
• Partner with cross-functional teams to define project roadmaps
• Translate complex technical concepts into actionable insights for data-informed decisions
• Champion organization-wide strategic initiatives and identify opportunities for process optimization and innovation
• Monitor advances in machine learning and data science and turn research into practical applications

Required qualifications

• Foundational understanding of AI/ML technologies and experience leveraging or positioning AI-driven solutions
• 12+ years as a Machine Learning Engineer or Data Scientist, leading high-impact projects that solve real-world business problems at scale
• Deep expertise in Python (pandas, scikit-learn, PyTorch) and SQL
• Hands-on experience in feature engineering, model evaluation, and error analysis
• In-depth knowledge of Large Language Models (LLMs) and their practical applications
• Ability to rapidly learn, evaluate, and adopt emerging technologies
• Outstanding interpersonal and technical communication skills

Nice to have

• Deep expertise in fine-tuning LLMs, advanced prompt engineering, Graph Neural Networks, Knowledge Graphs, and unsupervised clustering and evaluation
• Strong command of operating systems and distributed architectures, with proficiency in (Py)Spark, major public cloud platforms (AWS, Azure, GCP), and ML automation tooling such as Kubeflow
• Track record of technical innovation supported by research publications or patents
• Solid foundational understanding of networking and network security concepts

Benefits

• Various health plans
• Time off plans for vacation and sick time
• Parental leave options
• Retirement options
• Education reimbursement
• In-office perks

Before you apply

• Applicants must adhere to applicable laws, regulations, and Zscaler security and privacy policies

About the company

Zscaler is a cloud security company whose Zero Trust Exchange platform protects customers from cyberattacks and data loss. The company describes itself as building an AI-native enterprise where human potential is amplified by machine intelligence.