Sr. Security Engineer
CoStar Group4 months ago
Arlington, VA, USASenior
Base Salary
$115k - $203k/yr
Responsibilities
- Secure enterprise network changes across on-premises and cloud environments and audit network designs and configurations.
- Evaluate firewall change requests and design, enforce, and audit policies for NGFWs, load balancers, routers, switches, and wireless infrastructure.
- Manage and tune Secure Service Edge and SaaS security tooling to detect risky behavior, misconfigurations, and data-exfiltration paths.
- Review SaaS security architectures, define security standards, support incident investigations, and develop reusable review documentation.
- Assess security risks in AI platforms, copilots, agent-based systems, and AI-assisted workflows, including access controls, prompt and data leakage, and tool or plugin abuse.
- Monitor AI-related telemetry and logs, support threat modeling and risk assessments, and translate emerging AI security threats into enterprise safeguards.
Requirements
- Bachelor’s degree from an accredited, not-for-profit, in-person university or college.
- At least 5 years of experience in information security or security engineering.
- One or more industry-recognized certifications such as CISSP, SANS/GIAC, or CCNA.
- Strong experience securing AWS networking, including NACLs, Security Groups, ALB/NLB, Transit Gateway, and Network Firewall.
- Hands-on experience with NGFWs, WAFs, load balancers, and enterprise network segmentation.
- Strong scripting or automation skills in Python, PowerShell, or similar technologies.
- Deep understanding of subnetting, routing, and network isolation principles.
- Experience with SaaS security platforms, CASB, or SSE tooling.
- Familiarity with identity-driven security models such as SSO, OAuth, API tokens, and service principals is preferred.
- Working knowledge of Azure DevOps, Terraform, or infrastructure-as-code workflows is preferred.
- Experience in large, complex enterprise environments, strong technical documentation skills, and effective communication across technical and non-technical teams are preferred.
- Exposure to AI systems, model-assisted tooling, or developer copilots in an enterprise context is preferred.
- A track record of commitment to prior employers is required.
Benefits
- Comprehensive medical, vision, dental, prescription drug, life, legal, and supplementary insurance coverage.
- Virtual and in-person mental health counseling for individuals and families.
- Commuter and parking benefits.
- 401(k) retirement plan with matching contributions.
- Employee stock purchase plan and paid time off.
- Tuition reimbursement, internal training, and professional and academic growth opportunities.
- On-site fitness center or reimbursed fitness center membership where available, plus yoga, Pelotons, personal training, and group exercise classes.
- Diversity, Equity, & Inclusion Employee Resource Groups and complimentary snacks and beverages.
- Position located in Arlington or Richmond, Virginia, with in-office work Monday through Thursday and work from home on Friday.
About CoStar Group
CoStar Group builds subscription databases, analytics, and online marketplaces for commercial and residential real estate professionals, investors, and advertisers. Its portfolio includes CoStar (research and data), LoopNet (commercial listings), and Apartments.com (rental listings), generating revenue from subscriptions, listings, and advertising. The company is publicly traded on NASDAQ (CSGP) and is headquartered in Arlington, Virginia, with inclusion in the S&P 500 index.