Sr. Application Security Engineer

As a Sr. Application Security Engineer at vCluster Labs, you are the architect of trust in our diverse ecosystem. In this role, you will be responsible for the end-to-end security of our product, ensuring that vCluster remains the de facto standard for secure Kubernetes multi-tenancy. You will define the security standards that allow our customers to run high-privileged workloads without fear, building in-depth strategies that span our entire codebase and infrastructure.

• Core Product Security: Perform deep-dive security reviews of our core Go-based applications and Kubernetes controllers, as well as the frontend user interface. With a targeted focus on avoiding privilege escalation within our multi-tenant architecture.

• Threat Modeling: Lead the threat modeling process for new features, proactively identifying risks associated with shared GPU resources and multi-cloud environments.

• Automated Security: “Shift left” by continuing to integrate security checks into our CI and developer workflows. Optimizing these checks for speed, ensuring security never becomes a bottleneck for engineering velocity. Separately, you will manage automated and manual scanning of our entire product stack.

• Vulnerability Management: Own the lifecycle of security vulnerabilities from discovery to remediation. You will triage both external and internal reports, drive the resolution of critical issues across the engineering organization, and communicate effectively across stakeholders.

• Feature Development
  :
  Everyone at the organization contributes to both the ideas and development of new features. Many of which are directly related to security topics such as container breakouts and isolation, pushing the envelope of what’s possible in constrained environments.

• Developer training
  :
  Make complex topics easier to understand for all engineers, including new attack vectors and secure coding concepts.

• Experience: You have 5+ years in Application Security or Product Security, with a strong focus on containerized environments.

• Kubernetes Depth: You have a deep understanding of Kubernetes architecture, RBAC, and container runtime security. You understand the specific risks of multi-tenancy.

• Code Proficiency: You are comfortable reading and writing Go
  , which is the language of our core product. You can spot a vulnerability in a PR without relying solely on automated tools.

• Modern Tech Mindset: You thrive in fast-paced cutting-edge environments. You are excited to solve novel problems related to AI and multi-tenant infrastructure.

• Cognitive Flexibility: You view feedback as a learning mechanism, not a critique, and are willing to understand the unique needs and concerns of our customers.

• Certifications: CKS (Certified Kubernetes Security Specialist) or OSCP.

• AI/GPU Context: Experience securing AI workloads or GPU cloud infrastructure.

• Automation
  
  Skills:
  
  Experience writing custom security tooling or automation scripts in Python or Go.

• Documentation: A willingness to contribute to our public-facing security documentation and “Trust Center” to help our customers navigate compliance.

We are a venture-backed tech startup striving to be the leading force in enabling platform engineers. We raised +$30M from top-tier VCs such as Khosla Ventures (first investor in OpenAI, Git Lab, Stripe, Doordash) and are in a hyper-growth phase looking for motivated people to complement our team. Our headquarters are in San Francisco (Salesforce Tower), but our team is distributed around the globe and we have a remote-first work culture
.

We’re the company behind vCluster, an open-source technology for virtualizing Kubernetes ( +10k Git Hub stars). Open source is part of our DNA.

The adoption of our commercial product based on vCluster has grown extremely fast (multi-million dollar revenue) and our customer base includes some of the biggest companies in the world, including 6 Global Fortune 500 companies as well as some of the fastest-growing tech unicorns.

We offer the following benefits:

• Competitive Salary
  :
  We offer a…