Senior Data Scientist

Proofpoint is looking for a Senior Data Scientist to join our Machine Learning team. In this role, you’ll drive the evolution of our email threat detection engine, which protects some of the largest enterprises globally, from sophisticated email-based threats.

You will collaborate cross-functionally and lead major initiatives end-to-end ensuring that we apply state-of-the-art machine learning techniques to identify and solve the most impactful problems. You will also help promote machine learning best practices and encourage innovative approaches to problem-solving within the team., * Extract and derive actionable insights from massive volumes of unstructured email datasets using distributed computing tools (Spark, Iceberg, Athena) and AWS SageMaker

• Engineer features that capture communication behaviors and patterns across billions of email records, translating domain expertise into scalable feature pipelines
• Fine-tune LLMs for domain-specific tasks (email topic detection, NER) and train neural network models from scratch on massive volumes of email data to identify anomalous patterns and behaviors indicative of malicious threats
• Apply classical machine learning techniques (e.g., boosting, bagging) to train models that classify large volumes of imbalanced datasets with low-latency inference
• Deploy trained models to production using AWS SageMaker, directly impacting the effectiveness of our core threat detection products
• Partner with Product and Engineering teams to identify high-impact research areas and drive data-driven decision-making
• Mentor junior data scientists and drive adoption of ML best practices, fostering a culture of experimentation and continuous learning
• Evaluate emerging machine learning and AI advancements, and integrate promising techniques into our threat detection solutions

• Experience leading high-impact machine learning projects with demonstrated results in production environments
• Deep expertise in neural network architectures with proven experience applying them to real-world problems. Experience with graph neural networks or advanced fraud detection techniques is highly desirable
• Proficiency with one or more deep learning frameworks (PyTorch, TensorFlow, JAX). Experience with PyTorch Geometric or DGL is a plus
• Hands-on expertise with gradient boosting frameworks (XGBoost, CatBoost, LightGBM) for imbalanced classification tasks
• Experience monitoring and maintaining model performance in production, including detection and mitigation of model and data drift
• Experience leveraging LLMs and agentic workflows for research and problem-solving is a plus
• A collaborative mindset with genuine passion for high-impact work and a commitment to fostering innovative thinking within the team
• Strong listening skills; open to input from other team members and departments

At Proofpoint, we believe that an exceptional career experience includes a comprehensive compensation and benefits package. Here are just a few reasons you’ll love working with us

• Competitive compensation
• Comprehensive benefits
• Career success on your terms
• Flexible work environment
• Annual wellness and community outreach days
• Always on recognition for your contributions
• Global collaboration and networking opportunities

Our Culture

Our culture is rooted in values that inspire belonging, empower purpose and drive success-every day, for everyone.

Proofpoint is a global leader in human- and agent-centric cybersecurity. We protect how people, data, and AI agents connect across email, cloud, and collaboration tools. Over 80 of the Fortune 100, 10,000 large enterprises, and millions of smaller organizations trust Proofpoint to stop threats, prevent data loss, and build resilience across their people and AI workflows. Our mission is simple safeguard the digital world and empower people to work securely and confidently. Join us in our pursuit to defend data and protect people.

How We Work

At Proofpoint you’ll be part of a global team that breaks barriers to redefine cybersecurity guided by our BRAVE core values, Proofpoint is a leading cybersecurity company protecting organisations’ greatest assets and biggest risks vulnerabilities in people. With an integrated suite of cloud-based solutions, Proofpoint helps companies around the world stop targeted threats, safeguard their data, and make their users more resilient against cyber-attacks. Leading organisations of all sizes, including more than half of the Fortune 1000, rely on Proofpoint for people-centric security and compliance solutions mitigating their most critical risks across email, the cloud, social media, and the web.