Senior Identity Security Engineer (Arlington, VA or San Diego, CA)

CoStar Group•Arlington, VA

75d•Hybrid

About The Position

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. 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. The candidate must have hands-on experience implementing and operating modern IAM tools. Ideal candidates will have a thorough understanding of adversary in the middle attacks, social engineering attacks, and offensive privilege escalation techniques, and have experience implementing or operating controls to prevent such attacks. This position can be located in either Arlington, VA or San Diego, CA and is in office Monday through Thursday and work from home on Friday.

Requirements

Bachelor’s Degree required from an accredited, not for profit, in person, university or college.
A track record of commitment to prior employers
Thorough understanding of AitM attacks, Evilgnx and understanding on how to neutralize them through strong identity security hygiene
4+ years of hands-on security engineering experience, including implementation of new controls to address threats
Strong analytical and problem-solving skills with a data-driven approach to decision-making
Hands-on experience administrating industry-standard IDPs (Okta, PingID, Microsoft Entra ID, Active Directory)
Knowledge of authentication and authorization protocols such as SAML, OAuth, OIDC, Kerberos
Firm understanding of PKI, the FIDO2 framework, passkeys, Windows Hello for Business, and Platform SSO, Okta FastPass, Okta Device Trust
Solid understanding of role-based access control, least privilege, just-in-time access, and other identity security paradigms
Experience analyzing SIEM logs and creating related dashboards
Ability to read and author basic scripts in at least one common language (Python, PowerShell, Bash)

Nice To Haves

Hands-on experience with Microsoft Intune, Jamf, JumpCloud, or other MDM platforms
Experience with identity security testing tools such as Bloodhound, AzureHound, SharpHound, Responder, etc.
Record of automating operational tasks
Familiarity with CI/CD infrastructure
Experience configuring risk-based conditional access or authentication policies
Experience with workload identity governance
Strong written and verbal communications skills, with a demonstrated ability to communicate complex topics with both engineering peers and non-technical audiences
Experience with AI/ML-assisted security tooling, including building or deploying LLM-based agents

Responsibilities

Design, implement, and continuously improve identity security controls across various platforms
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)
Research, prototype, and operationalize AI-assisted tooling and agentic workflows to improve team efficiency, including automating repetitive analysis and building internal tools that surface identity risk
Document projects, standards, and runbooks
Communicate frequently and effectively with both technical and non-technical stakeholders
Participate in attack path management efforts via commercial and open-source tools
Stay current with the greater identity threat landscape as well as the identity defense offerings from major IDP vendors

Benefits

Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug
Life, legal, and supplementary insurance
Virtual and in person mental health counseling services for individuals and family
Commuter and parking benefits
401(K) retirement plan with matching contributions
Employee stock purchase plan
Paid time off
Tuition reimbursement
On-site fitness center and/or reimbursed fitness center membership costs (location dependent)
Access to CoStar Group’s Employee Resource Groups
Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks