# Senior Identity Security Engineer (Arlington, VA or San Diego, CA) at CoStar Group

- Company: CoStar Group
- Company website: https://www.costargroup.com
- Type: Startups
- Level: Senior
- Location: US-VA Arlington
- Work setup: On-site
- Pay: $133K to $203K base salary per year (USD)
- Posted: 2026-10-22
- Apply by: 2026-12-06
- Apply: https://costar.wd1.myworkdayjobs.com/en-US/CoStarCareers/job/US-VA-Arlington/Senior-Identity-Security-Engineer--Arlington--VA-or-San-Diego--CA-_R39662?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/costar-group-senior-identity-security-engineer-arlington-va-or-san-diego-ca/

## About the role

In this role, you'll harden controls to empower 8000 employees to seamlessly and securely connect to company resources through a zero trust, FIDO2 compliant framework. You will assess, identify and mitigate risks across a large technical infrastructure and corporate environment. This position will work with Security, Systems, DevOps, Network, and Development teams to drive and shape the way our employees and engineers access our systems. Found on 1752vc Careers, the job board for startup and VC roles.

## What they're looking for

- Design, implement, and continuously improve identity security controls across various platforms
- Harden Tier 0 identity infrastructure, including domain controllers, AD CS, Entra Connect, and privileged roles, in line with Microsoft’s Enterprise Access Model
- Develop and maintain conditional access policies that enforce appropriate authentication strength, device compliance, etc including for privileged roles, sensitive applications, and workload identities
- Analyze logs to scope and guide rollouts of new security initiatives
- Support an org-wide, multi-platform phish-resistant authentication rollout
- Engineer controls around AI and workload identities (service principals, managed identities, OAuth app registrations)


Source: 1752vc Careers, https://www.1752.vc/careers/jobs/costar-group-senior-identity-security-engineer-arlington-va-or-san-diego-ca/