Job Description

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

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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 hardencontrolstoempower8000 employees toseamlessly and securely connect tocompany resourcesthrough a zero trust, FIDO2 compliant framework.You will assess, identify and mitigate risksacross 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 havea thorough understanding ofadversary in the middle attacks, social engineering attacks,andoffensive privilege escalation techniques, and have experienceimplementing 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.

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

Basic Qualifications

• 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)

Preferred Qualifications and Skills

• 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

What’s in it for You

When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed.

We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement.

Our benefits package includes (but is not limited to):

• 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

The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies.

Base Compensation: $133,000 – $203,000 Annually

We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position.

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CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing