Sr. Security Engineer

CoStar Group is seeking a Senior Security Engineer to help evolve and safeguard the company's enterprise security posture. The ideal candidate has experience in Network, SaaS, and AI Security, and can communicate security concepts effectively to technical and non-technical audiences.

Requirements

• Bachelor’s Degree from an accredited, not-for-profit university or college
• 5+ years of experience in Information Security or Security Engineering
• One or more industry-recognized certifications (e.g., CISSP, SANS/GIAC, CCNA, equivalent)
• Strong experience securing AWS networking (NACLs, Security Groups, ALB/NLB, Transit Gateway, Network Firewall)
• Hands-on experience with NGFWs, WAFs, load balancers, and enterprise network segmentation
• Strong scripting or automation skills (Python, PowerShell, or similar)
• Deep understanding of subnetting, routing, and network isolation principles
• Experience with SaaS security platforms, CASB, or SSE tooling
• Familiarity with identity-driven security models (SSO, OAuth, API tokens, service principals)
• Working knowledge of Azure DevOps, Terraform, or infrastructure-as-code workflows
• Experience operating in large, complex enterprise environments
• Ability to produce high-quality technical documentation and security standards
• Strong communication and collaboration skills across technical and non-technical teams
• Exposure to AI systems, model-assisted tooling, or developer copilots in an enterprise context

Benefits

• Comprehensive healthcare coverage
• Life, legal, and supplementary insurance
• Virtual and in-person mental health counseling services
• 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
• Access to CoStar Group's Diversity, Equity, & Inclusion Employee Resource Groups
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks