Security Engineer

What You’ll Do

• Lead Security for Our Platform. Take charge of application, cloud, network, and AI agent security. This includes performing secure design reviews, overseeing threat modeling, and building new security primitives into our product and platform.
• Collaborate with Cross-Functional Teams. Partner closely with engineering, product, and GRC to embed security throughout the software development lifecycle. Communicate risks, prioritize fixes, and ensure security requirements enable innovation.
• Implement Automation & Tooling. Streamline security processes by integrating tooling into CI/CD pipelines and leveraging AI-based or next-gen solutions to automate scans, compliance checks, and infrastructure reviews.
• Continuously Improve Security Posture. Conduct regular audits of our cloud environment, review IAM configurations, and stay on top of emerging AI security risks. Recommend strategic security initiatives and lead efforts to establish best practices as the company scales.
• Enable Enterprise Customer Needs. Present and explain our security posture to enterprise clients, helping them understand how we secure their data. Address concerns around healthcare, financial, or other regulated data with clear, actionable insights.

• Broad Security Expertise. Strong foundation in web application security, cloud security (AWS, Azure, or GCP), and networking principles.
• Coding and Dev Ops Skills. Hands‑on experience with programming production software, scripting, and Dev Ops tools for automation. Familiarity with secure coding practices, threat modeling, vulnerability scanning, and incident response processes.
• Adaptability and Resilience. Comfort working in a fast‑paced startup environment, ability to adapt to changing priorities and handle ambiguity with grace.
• Communication and Collaboration. Strong written and verbal communication skills with the ability to clearly explain risk trade‑offs and convey complex technical topics to both technical and non‑technical audiences.
• Curiosity & Customer‑First Mindset. Passion for deeply understanding customer needs and finding the right solutions from first principles.

• Experience securing AI systems, with understanding of LLM and Agentic AI risks.
• Prior success in securing cloud infrastructure with robust policies and automated enforcement, and familiarity with Infrastructure as Code (Terraform, Cloud Formation).
• History of building or integrating custom security tools, especially those leveraging AI/ML for detection or monitoring.
• Familiarity with continuous compliance platforms and building control monitoring.
• Experience designing strong foundations with secure‑by‑design and privacy‑by‑design practices such as data handling, anonymization, and de‑identification.

• Flexible (unlimited) paid time off
• Medical, dental, and vision benefits for you and your family
• Life insurance and disability benefits
• Retirement plan dependent on country of employment
• Parental leave
• Fertility and family building benefits through Carrot
• Lunch, as well as delicious snacks and coffee to keep you energized
• Discretionary benefit stipend giving people the ability to spend where it matters most
• Free alphorn lessons

These benefits are further detailed in Sierra’s policies, may vary by region, and are subject to change at any time, consistent with the terms of any applicable compensation or benefits plans. Eligible full‑time employees can participate in Sierra’s equity plans subject to the terms of the applicable plans and policies.

We’re working to bring the transformative power of AI to every organization in the world. To do so, it is important to us that the diversity of our employees represents the diversity of our customers. We believe that our work and culture are better when we encourage, support, and respect different skills and experiences represented within our team. We encourage you to apply even if your experience doesn’t precisely match the job description.

We strive to evaluate all applicants consistently without regard to race, color, religion, gender, national origin, age, disability, veteran status, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class.