Senior Cloud Platform Security Engineer

Job Description

Overview

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information analytics and the S&P 500 Index and the NASDAQ 100 CoStar Group is on a mission to digitize the worlds 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 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 continue that effort today and are always working to improve and how we deliver for our customers our employees and equipping the brightest minds with the best resources available we provide an invaluable edge in realestate.

CoStar builds and operates web applications related to real applications include and 75 other of our product security is our product platform security environment which consists of commercial and custom developed security controls that run within the IDE the CI/CD system across cloud and Kubernetes platforms and our product product platform security engineering group builds and operates centralized controls using infrastructure as code scripting and API integrations to scale security across all web applications in a consistent manner.

This position is located in Arlington VA or Richmond VA and offers a schedule of Monday through Thursday in office and Friday work from home.

Responsibilities

Features (responsibilities and goals) of our product platform security suite:(AKA - what you will be building and evolving along a rockstar team that learns from and pushes each other to do great things!)

• Cloud Security and Guardrails: Enforce security posture across AWS GCP and Azure through preventative controls (SCPs organization policies IAM guardrails) and detective controls (Wiz native cloud security services). Build detection patterns and escalation paths in partnership with incident response. Drive validation methodology and operational rigor across acquisitions and new environments.
• Kubernetes Platform Security: Lead workload protection strategy across EKS clusters including runtime monitoring admission control network policy and secrets management. Drive sensor coverage validation incident response readiness and security guardrails that scale across the portfolio.
• AI and Agentic System Security: Partner with product engineering on securing AI-powered features MCP server implementations and agentic workflows across the portfolio. Lead threat modeling for new AI surfaces build guardrails and detection patterns for prompt injection and unauthorized tool use and shape security standards as the company expands AI capabilities into customer-facing products.
• Security Automation: Integrate automated scanning tools into CI/CD pipelines implement IaC solutions and drive automated remediation processes.
• Mentorship & Collaboration: Work closely with product dev teams to provide feedback on secure coding practices proactively guide them on risk remediation.

Basic Qualifications

• Bachelors Degree required from an accredited not for profit in person universityorcollege(preferablyinComputer Science Cybersecurity or a related field).
• A track record of commitment to prior employers.
• 6 years of hands-on security engineering experience with depth in at least one and meaningful exposure to others among the following domains:
  • Securing cloud-native environments (AWS preferred).
  • Kubernetes platform hardening or monitoring.
  • CI/CD pipelines containerized application deployments and IAC and software supply chain security.
• Demonstrated track record of taking security initiatives from scoping through production rollout and operational ownership.
• Demonstrated ability to author scripts or IAC from scratch in either Python PowerShell Ansible CloudFormation Terraform or similar language.
• Securing AI-powered applications including threat modeling for LLM-based features MCP server implementations or agentic systems.
• Experience working in a software development environment with a mature CI/CD.
• Passion for solving complex challenges innovating and engaging in your work.

Preferred Qualifications and Skills

• A self-starter who can advance the platform security program and follow-through ideas to completion.
• Experience with tools and services like AWS GuardDuty Security Hub EKS OPA/Gatekeeper Falco Wiz Datadog Prisma Cloud Orca Upwind Snyk or similar.
• Familiarity with software supply chain security including SBOM generation dependency vulnerability management build provenance and artifact signing.
• Knowledge of infrastructure operations across databases network and system administration.
• Effective use of AI tools as a force multiplier for engineering work with judgment about when AI accelerates work versus when it creates rework.
• Ability to communicate with different levels of leadership conveying risk and driving urgency for risk remediation.
• Familiarity with zero trust principles and cloud-native access controls (e.g. IAM roles service meshes).
• Ability to mentor and train team members to prioritize security efforts effectively.
• Hands-on experience implementing security tools into CI/CD pipelines.
• Experience testing serverless cloud deployments.

Whats in it for You

When you join CoStar Group youll 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) with yoga studio Pelotons personal training group exercise classes
• Access to CoStar Groups Employee Resource Groups
• Complimentary gourmet coffee tea hot chocolate fresh fruit and other healthy snacks

We welcome all qualified candidates who are currently eligible to work full-time in the United States to 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