Principal ML Architect – Security AI & Advanced Model Systems

Proofpoint

Sunnyvale, CA

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JOB DETAILS

SALARY

$254,000–$349,250 Per Year

SKILLS

Analysis Skills, Artificial Intelligence (AI), Artificial Intelligence (AI) Agents, Automation, Best Practices, Best Sales Team, Cloud Computing, Compensation and Benefits, Computer Programming, Computer Security, Continuous Improvement, Data Management, Data Sets, Deep Learning, Ecosystems, Enterprise Protection, Experiment Design, High Throughput, ISO (International Organization for Standardization), Information/Data Security (InfoSec), Internet Security, Loss Prevention, Machine Learning, Machine Tool, Memory Hardware, Metrics, Microsoft Outlook, Network Connectivity, Noise Modeling, Open Source, Operational Strategy, Performance Management, Performance Modeling, Privacy Controls, Python Programming/Scripting Language, Realtime Operating System, Regulatory Compliance, Risk, Security Architecture, Security Information and Event Management (SIEM), Security Infrastructure, Software as a Service (SaaS), Systems Engineering, Telemetry, Use Cases

LOCATION

Sunnyvale, CA

POSTED

Today

About Us:

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:

Bold in how we dream and innovate

Responsive to feedback, challenges and opportunities

Accountable for results and best in class outcomes

Visionary in future focused problem-solving

Exceptional in execution and impact

Role Overview

We are seeking a Principal ML Architect to lead the design and development of next-generation AI systems for cybersecurity , leveraging state-of-the-art LLMs/SLMs and advanced machine learning techniques .

This role requires deep expertise in model architecture, training, fine-tuning, and distillation , combined with a strong understanding of security domains such as threat detection, anomaly detection, data protection, and AI safety .

You will drive the development of intelligent, security-focused AI systems and agents capable of operating at scale across high-volume, adversarial, and sensitive environments , while ensuring robustness, explainability, and compliance .

Key Responsibilities

AI Architecture for Security Systems

+ Design and lead architecture for AI-driven security platforms , including:

+ Threat detection and behavioral analytics

+ Data loss prevention (DLP) and insider risk detection

+ AI usage monitoring and policy enforcement (GenAI security)

+ Build systems that process high-volume, high-velocity security telemetry in real time

Model Development & Innovation

+ Lead development of state-of-the-art SLMs/LLMs tailored for security use cases:

+ Log analysis, alert triage, threat intelligence, policy reasoning

+ Drive experimentation with modern architectures (Transformers, MoE, retrieval-augmented systems, hybrid models)

+ Balance trade-offs between model accuracy, latency, interpretability, and cost

Training, Fine-Tuning & Distillation

+ Architect pipelines for:

+ Domain adaptation and instruction tuning on security-specific datasets

+ Model distillation and compression for efficient deployment in enterprise environments

+ Design and execute experiments for:

+ Alignment (RLHF/RLAIF) in security-sensitive contexts

+ Red-teaming and adversarial robustness of models

AI Agents for Security Workflows

+ Design and oversee AI agents that:

+ Automate security operations (SOC workflows, triage, investigation)

+ Integrate with enterprise tools (SIEM, EDR, SaaS platforms)

+ Define architectures for tool use, reasoning, memory, and policy-aware decision making

Experimentation & Evaluation

+ Establish rigorous evaluation frameworks for:

+ Detection accuracy, false positives/negatives

+ Model robustness under adversarial conditions

+ Safety, hallucination, and misuse risks

+ Lead deep experimentation cycles to continuously improve model performance and reliability

Productionization & Scale

+ Guide deployment of models into enterprise-scale, real-time environments

+ Optimize inference systems for low latency, high throughput, and cost efficiency

+ Collaborate with platform teams on ML infrastructure, data pipelines, and observability

Security, Governance & Responsible AI

+ Ensure models and systems meet enterprise security standards (SOC2, ISO, GDPR, etc.)

+ Establish best practices for:

+ Secure model development and deployment

+ Data privacy and protection in training pipelines

+ Responsible AI and model safety in adversarial environments

Required Qualifications

Experience

+ 10+ years in ML/AI systems, with significant focus on deep learning and production ML

+ Proven experience in:

+ Building or scaling LLMs/SLMs or advanced ML systems

+ Applying ML/AI in security, fraud, risk, or adversarial domains

+ Track record of delivering production-grade AI systems at scale

Technical Expertise

+ Deep understanding of:

+ Transformer architectures and modern LLM techniques

+ Retrieval-augmented generation (RAG) and hybrid AI systems

+ Model training dynamics, scaling laws, and optimization

+ Hands-on experience with:

+ Training, fine-tuning, and distilling models

+ Efficient inference (quantization, pruning, batching)

+ Distributed training frameworks (PyTorch, DeepSpeed, FSDP, etc.)

Security Domain Knowledge

+ Strong understanding of one or more:

+ Security telemetry (logs, network traffic, endpoint data)

+ Threat detection and anomaly detection systems

+ Identity, access, and data protection systems

+ Familiarity with security tooling ecosystems (SIEM, EDR, CASB, etc.)

Systems & Engineering

+ Experience designing high-throughput, low-latency ML systems

+ Strong programming skills in Python , with production experience

+ Understanding of data pipelines, feature engineering, and MLOps practices

Preferred Qualifications

+ Experience building AI systems for SaaS security or GenAI security platforms

+ Familiarity with multi-agent systems for security automation

+ Experience with synthetic data generation for security use cases

+ Contributions to AI/ML research, open-source, or security tooling

+ Background in AI safety, adversarial ML, or model interpretability

Success Metrics

+ Development of high-precision, low-noise security AI models

+ Successful deployment of AI agents automating security workflows

+ Measurable improvements in detection accuracy and operational efficiency

+ Robustness of models against adversarial and real-world attack scenarios

+ Strong adherence to enterprise security, privacy, and compliance standards

Why This Role Matters

This role is central to building intelligent, AI-native security systems that can operate at enterprise scale and under adversarial conditions . The Principal ML Architect will define the technical foundation for secure, reliable, and high-performance AI systems , enabling the organization to lead in next-generation cybersecurity powered by AI .

Why Proofpoint?

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.

We encourage applications from individuals of all backgrounds, experiences, and perspectives. If you need accommodation during the application or interview process, please reach out to accessibility@proofpoint.com .

How to Apply

Interested? Submit your application along with any supporting information- we can’t wait to hear from you!

Consistent with Proofpoint values and applicable law, we provide the following information to promote pay transparency and equity. Our compensation reflects the cost of labor across several U.S. geographic markets, and we pay differently based on those defined markets as set out below. Pay within these ranges varies and depends on job-related knowledge, skills, and experience. The actual offer will be based on the individual candidate. The range provided may represent a candidate range and may not reflect the full range for an individual tenured employee. This role may be eligible for variable compensation and/or equity. We offer a competitive benefits package, including flexible time off, a comprehensive well-being program with two paid Wellbeing Days and two paid Volunteer Days per year, plus a three-week Work from Anywhere option.

Base Pay Ranges:

SF Bay Area, New York City Metro Area:

Base Pay Range: 254,000.00 - 349,250.00 USD

California (excludes SF Bay Area), Colorado, Connecticut, Illinois, Washington DC Metro, Maryland, Massachusetts, New Jersey, Texas, Washington, Virginia, and Alaska:

Base Pay Range: 208,800.00 - 287,100.00 USD

All other cities and states excluding those listed above:

Base Pay Range: 187,000.00 - 257,180.00 USD

Proofpoint has been honored with six Best Places to Work Awards in 2024 by workplace culture leader Comparably, including Best Company Career Growth, Best Company Outlook, Best Global Culture, Best Engineering Teams, Best Sales Teams, and Best HR Teams.

We are the leader in human-centric cybersecurity. Half a million customers, including 87 of the Fortune 100, rely on Proofpoint to protect their organizations. We’re driven by a mission to stay ahead of bad actors and safeguard the digital world. Join us in our pursuit to defend data and protect people.

Our BRAVE Values:

At Proofpoint, we are BRAVE in everything we do, and our values aren’t just words—they shape how we work, collaborate, and grow.

We seek people who are bold enough to challenge the status quo, responsive in the face of ever-evolving threats, and accountable for delivering real impact.

We value those with a visionary mindset who anticipate what’s next and push cybersecurity forward, and we celebrate exceptional execution that ensures we continue to defend data and protect people.

Proofpoint is an equal opportunity employer, we hire without consideration to race, religion, creed, color, national origin, age, gender, sexual orientation, marital status, veteran status or disability.

Find your network, your allies, and your biggest fans. We know that work is simply better when you’re surrounded by people who inspire you—who share ideas, cheer you on, and genuinely want to see you succeed. That’s why we offer social circles, sponsored networks, and connection points across teams and time zones—to help you find your people, build your community, and thrive together.

This isn’t just a job—it’s a mission to protect people and defend data in a world that never slows down. We’re building the future of human-centric cybersecurity, and that future belongs to all of us. We take ownership, move fast, and hold ourselves accountable—because that’s what it takes to stay ahead. And we do it together, winning as one.

Be empowered to reach your full potential through meaningful challenges and personalized support—designed around you and your goals. Whether you're growing as a leader or leveling up from great to exceptional as an individual contributor, we’re here to help you get there.
Proofpoint is an equal opportunity employer, we hire without consideration to race, religion, creed, color, national origin, age, gender, sexual orientation, marital status, veteran status or disability.

About the Company

Proofpoint

Proofpoint, Inc. (NASDAQ:PFPT) is a leading cybersecurity company that protects organizations’ greatest assets and biggest risks: their people. With an integrated suite of cloud-based solutions, Proofpoint helps customers around the world stop targeted threats, safeguard their data, and make their users more resilient against cyber attacks. Leading organizations of all sizes, including more than half of the Fortune 100, rely on Proofpoint to mitigate their most critical security and compliance risks across email, the cloud, social media, and the web. No one protects people, the data they create, and the digital channels they use more effectively than Proofpoint.

If you’re looking for a customer-focused, driven-to-win organization with leading-edge products, you’ll find many exciting reasons to join our team. We believe in hiring smart, motivated, problem-solvers to cultivate a culture of collaboration and appreciation. We are an international company with locations in North America, EMEA and APAC, with each location contributing to our culture.

COMPANY SIZE

2,500 to 4,999 employees

INDUSTRY

Computer/IT Services

EMPLOYEE BENEFITS

Performance Bonus, 401K, Employee Referral Program, Employee Events

FOUNDED

2002

WEBSITE

https://www.proofpoint.com

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