Sr. Software Engineer - AI Agents

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.

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

Proofpoint is a leading cybersecurity company protecting organizations’ 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 organizations 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.
We are singularly devoted to helping our customers protect their greatest assets and biggest security risk: their people. That’s why we’re a leader in next-generation cybersecurity.
Protection Starts with People. Proofpoint.

Proofpoint is hiring a Senior Software Engineer on Satori
, our enterprise AI agent platform driving the future of autonomous security operations. Satori delivers security outcomes by orchestrating capabilities across the entire Proofpoint product portfolio and external partners.

In this role, you will develop core AI agent capabilities with an eye toward scale — including reasoning workflows, memory systems, alignment mechanisms, and guardrails — using Python-based, cloud-native architectures and third-party agent platforms.

The environment is fast-paced, rapidly scaling, and highly collaborative across multiple engineering and product teams. This is an application engineer role on a product that has platform aspects. The opportunity for transformational impact is significant.

• Design and build Python-based backend services that power Satori’s core AI agent platform.
• Integrate LLMs, vector search, and agent frameworks into scalable, cloud-native services.
• Implement agent behaviors such as memory, context handling, reasoning workflows, alignment, guardrails, and multi-agent collaboration.
• Deliver reliable, high-quality features that support rapid iteration and platform scaling.
• Collaborate closely with product, applied AI, platform, and engineering teams across the organization.
• Participate in architecture and design discussions, code reviews, and drive operational readiness through documentation and automation.
• Mentor earlier-career software engineers with a team-first mentality.

• 5+ years of experience developing production-grade software.
• Strong Python experience and proven ability to build distributed, production-grade backend platforms or services.
• Hands-on experience developing AI agents using common tech stacks (e.g. A2A), including memory, reasoning, workflow orchestration, tool use, and/or guardrail mechanisms.
• Familiarity with Docker, cloud environments, and CI/CD pipelines.
• Ability to thrive in a fast-paced, rapidly scaling environment.
• Excellent cross-team collaborator with strong communication skills.

• Experience integrating LLMs, RAG, or vector search into production systems.
• Experience with agent safety, evaluation, or alignment techniques.
• Background in enterprise SaaS or large-scale distributed systems.
• Proficiency with an AI-assisted development tools like Windsurf, Cursor, Claude Code, etc.
• Exposure to cybersecurity products or domains.
• Strategic mindset…