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Full-time
bachelor degree
Medical Insurance, Vision Insurance, Dental Insurance, Prescription Drug Coverage, Life Insurance, Legal Insurance
Posted 74d ago
~40 hrs/week
Responsibilities
Build and operate centralized security controls across cloud and Kubernetes platforms using infrastructure as code and API integrations. Lead security strategies for AI-powered features, workload protection, and automated remediation within CI/CD pipelines.
Requirements
Requires a Bachelor's degree and 6+ years of security engineering experience with expertise in cloud-native environments and Kubernetes. Must be proficient in scripting or IaC languages and have experience securing AI-powered applications.
Full job description
Senior Cloud Platform Security Engineer
<br>
Job Description
<br>
Overview
CoStar Group 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.
CoStar builds and operates web applications related to real estate. Web applications include Apartments.com, Homes.com, Lands.com, CoStar.com, and 75 other web applications. The backbone 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 edge. Our 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
Bachelor’s Degree required from an accredited, not for profit, in person, university or college (preferably in Computer 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:
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.
What’s in it for You
When you join CoStar Group, you’ll 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 Group’s 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 apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position.
#LI-KW1
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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
CoStar Group (NASDAQ: CSGP) is a global leader in commercial real estate information, analytics, online marketplaces, and 3D digital twin technology. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives.
CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible, STR, a global leader in hospitality data and benchmarking; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom.
CoStar Group’s websites attracted over 143 million average monthly unique visitors in the third quarter of 2025, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.
Offices: 1201 Wilson Blvd, Arlington, Virginia 22209, US · 181 Bay St, Suite 3420, Toronto, Ontario M5J, CA · 81, Rue Taitbout, Paris, Île-de-France 75009, FR · Calle de Serrano, 47, 13th Floor, Madrid, 28001, ES · 32 London Bridge, 26th Floor, The Shard, London, England SE1 9SG, GB
ResearchMarketingProduct DevelopmentAnalyticsCommercial Real EstateSalesReal Estateand TechnologyCommercial Real EstateAnalytics
CoStar Group (NASDAQ: CSGP) is a global leader in commercial real estate information, analytics, online marketplaces, and 3D digital twin technology. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives.
CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible, STR, a global leader in hospitality data and benchmarking; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom.
CoStar Group’s websites attracted over 143 million average monthly unique visitors in the third quarter of 2025, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.
Offices: 1201 Wilson Blvd, Arlington, Virginia 22209, US · 181 Bay St, Suite 3420, Toronto, Ontario M5J, CA · 81, Rue Taitbout, Paris, Île-de-France 75009, FR · Calle de Serrano, 47, 13th Floor, Madrid, 28001, ES · 32 London Bridge, 26th Floor, The Shard, London, England SE1 9SG, GB
ResearchMarketingProduct DevelopmentAnalyticsCommercial Real EstateSalesReal Estateand TechnologyCommercial Real EstateAnalytics