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

CoStar Group, Inc.; Arlington (VA); On-site; USD 133,000 - 203,000; Full time

Benefits offered by this job

Healthcare coverage

401(k) matching

Stock purchase plan

Paid time off

Tuition reimbursement

Job summary

CoStar Group is seeking a Senior Identity Security Engineer in Arlington, VA or San Diego, CA to fortify identity security controls across platforms. You will develop conditional access, review logs, and support an org-wide phish-resistant authentication rollout, collaborating with Security, DevOps, and Development teams.

The role emphasizes AI-assisted tooling and workload identities, with a focus on PKI, FIDO2, and device compliance, under a zero-trust framework.

Qualifications

• Bachelor’s Degree required from an accredited university.
• 4+ years of hands-on security engineering experience.
• Experience administrating IDPs (Okta, PingID, Entra ID, Active Directory).
• Knowledge of SAML, OAuth, OIDC, Kerberos and PKI/FIDO2.

Responsibilities

• Design, implement, and improve identity security controls across platforms.
• Develop conditional access policies enforcing strong authentication.
• Analyze logs to guide rollouts of security initiatives.
• Document projects, standards, and runbooks; communicate with stakeholders.

Skills

Analytical problem solving

Data-driven decision making

Python scripting

Reading SIEM logs

Identity security hygiene

Education

Bachelor’s Degree

Tools

Okta

PingID

Microsoft Entra ID

Active Directory

Job description

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

Job Description

Overview

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.

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 Adversary in the Middle 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

• 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

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.

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

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 37 years, giving us the perspective to create truly unique and valuable products and services. We've continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry and for our customers. 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.

CoStar Group is committed to creating a diverse environment and is proud to be an equal opportunity workplace and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. CoStar Group is also committed to compliance with all fair employment practices regarding citizenship and immigration status. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access www.costargroup.com/careers as a result of your disability. You can request reasonable accommodations by sending an email to [e-mail].