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

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 em ployees 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.

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