[10 / 11 / 2025] Senior Security Engineer - Infrastructure Security

Security team at Poshmark is responsible for securing our application platform, cloud infrastructure, and IT systems to protect Poshmark and its 60 million Community members. As a AWS and Infrastructure Security Engineer, you will collaborate with other security team members and other stakeholders to design and harden infrastructure, network and access implementing security best practices.

Responsibilities :

• Design, implement and maintain secure AWS architecture aligned with industry standards, security best practices and CIS benchmarks.
• Harden corporate IT and SaaS applications (Okta, CrowdStrike, Jamf, etc.) through security best practices and layered defense.
• Develop and maintain cloud and infrastructure security reference architectures, and policies.
• Continuously assess and manage vulnerabilities across cloud, infrastructure, and endpoint systems.
• Conduct regular security gap analyses, security reviews, risk assessments, and drive remediation with system owners.
• Integrate infrastructure security into CI / CD pipelines and change management processes.
• Architect and enforce cloud and enterprise IAM controls with Okta and AWS IAM, focusing on least privilege, SSO, and federation.
• Strengthen endpoint and server protection through configuration management and continuous monitoring.
• Partner with Engineering, DevOps, SRE, IT, and Compliance teams to ensure security requirements are embedded throughout the infrastructure lifecycle.
• Help with incident response activities across AWS and corporate environments including detection, investigation, containment, eradication, and recovery.
• Mentor junior engineers and contribute to a culture of proactive, engineering-driven security.

Requirements :