BILL (NYSE: BILL) provides financial automation software for small and midsize businesses (SMBs), streamlining payables, receivables, and expense management. Backed by Emergence Capital.
About the role
We are looking to hire a Sr. Staff AI Security Engineer to lead the secure deployment and operation of AI and ML systems across the company. This role moves beyond traditional perimeter security to address the unique vulnerabilities of Large Language Models (LLMs) and automated orchestration layers. Your mission: provide a secure foundation—gateways, orchestration layers, and tool ecosystems—that enables developers to innovate at pace while maintaining a robust security posture.
What they're looking for
- A proven track record of building and scaling security systems in high-growth environments
- High proficiency in Python or Go to build, automate, and scale security tooling
- Deep understanding of LLM-specific attack vectors: prompt injection and jailbreaking
- Deep understanding and applied experience with the OWASP LLM Top 10 framework
- Experience designing secure API gateways, orchestration layers, and scalable security infrastructure using infrastructure as code
- Experience standing up red-teaming or adversarial testing programs
More about this role
At BILL, we believe in empowering the businesses that drive our economy. By replacing outdated financial processes with innovative tools, we help businesses—from startups to established brands—make smarter decisions and gain control of their operations. And we don’t stop there: we’re creating the future of financial automation so businesses can spend more time on what matters.
Working here means you become part of a vision-driven team that’s ready to tackle challenges and build cutting-edge solutions. We value purpose, drive, and curiosity—and we thrive in a fast-paced, ever-changing environment. We're remote-first, with office spaces in San Jose, CA and Draper, UT — and opportunities to connect in person when it counts. BILLders collaborate to deliver real impact for businesses that need more time in their busy weeks.
BILL builds high performing teams and we seek to hire the best talent for every role. We're committed to building a workplace that fosters inclusion and diverse perspectives, valuing each person’s unique skills and experiences. We’d love to hear from you—you might be just what we’re looking for, whether in this role or another.
✨ Let’s give businesses more time for...
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