C

CoStar Group

Commercial real estate data, analytics, marketplaces

Senior Cloud Platform Security Engineer

Full-TimeUpdated on 10/23/2026
$115k - $203k/yr+ 401(k) match + Employee stock purchase plan
Senior
Bachelor's
Irvine, CA, USA+2 moreMore locations: Richmond, VA, USA | Arlington County, Arlington, VA, USA
HybridIn office Monday–Thursday and work from home Friday at Arlington, Richmond, or Irvine.
CybersecuritySecurity Engineering & Architecture
No H1B Sponsorship

About the job

Requirements
  • A bachelor's degree from an accredited, not-for-profit, in-person university or college is required; a degree in Computer Science, Cybersecurity, or a related field is preferred.
  • A track record of commitment to prior employers is required.
  • At least 6 years of hands-on security engineering experience is required, with depth in at least one and meaningful exposure to others among securing cloud-native environments, Kubernetes platform hardening or monitoring, CI/CD pipelines, containerized application deployments, infrastructure as code, and software supply chain security.
  • Demonstrated experience taking security initiatives from scoping through production rollout and operational ownership is required.
  • Ability to author scripts or infrastructure as code from scratch in Python, PowerShell, Ansible, CloudFormation, Terraform, or a similar language is required.
  • Experience securing AI-powered applications, including threat modeling for LLM-based features, MCP server implementations, or agentic systems, is required.
  • Experience working in a software development environment with a mature CI/CD is required.
Responsibilities
  • Enforce cloud security posture across AWS, GCP, and Azure through preventative controls such as SCPs, organization policies, and IAM guardrails, and detective controls such as Wiz and 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.
  • 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.
  • 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 AI capabilities expand into customer-facing products.
  • Integrate automated scanning tools into CI/CD pipelines, implement infrastructure-as-code solutions, and drive automated remediation processes.
  • Work closely with product development teams to provide feedback on secure coding practices and proactively guide them on risk remediation.
Desired Qualifications
  • Experience with tools and services such as AWS GuardDuty, Security Hub, EKS, OPA/Gatekeeper, Falco, Wiz, Datadog, Prisma Cloud, Orca, Upwind, and Snyk, or similar tools and services.
  • 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 to accelerate engineering work, with judgment about when AI speeds up work versus when it creates rework.
  • Ability to communicate risk to different levels of leadership and drive urgency for risk remediation.
  • Familiarity with zero-trust principles and cloud-native access controls, such as IAM roles and 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.

About the company

CoStar Group provides information, analytics, and online marketplaces for the commercial real estate industry. Its core products are detailed property data, market analyses, and tools to compare and evaluate properties, delivered via subscription access. It also runs online marketplaces like Apartments.com and LoopNet that connect renters with apartments and buyers/tenants with commercial properties, earning revenue from subscriptions, advertising, and transaction fees. The company differentiates itself through a large, integrated data platform and a suite of marketplaces that cover both residential rentals and commercial properties, with a strong presence in the U.S. and expanding globally. Its goal is to help brokers, property owners, investors, and lenders make informed real estate decisions and efficiently connect buyers, renters, and property listings across markets.

Company Size

5,001-10,000

Company Stage

IPO

Headquarters

Washington DC, District of Columbia

Founded

1987

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Simplify's Take

What believers are saying

  • Q2 2026 revenue hit $925 million, with adjusted EBITDA rising to $184 million.
  • Homes.com posted first profitable quarter, with Q2 2026 adjusted EBITDA of $12 million.
  • CoStar projects 2026 revenue of $3.8 billion and repurchases $2.0 billion of stock.

What critics are saying

  • Four antitrust suits consolidate in Virginia, threatening injunctions, damages, and forced business changes.
  • CoStar’s July 2025 copyright fight with Zillow escalates, risking counterclaims and marketplace retaliation.
  • Homes.com still depends on heavy spending; activist pressure targets Andy Florance’s strategy through 2029.

What makes CoStar Group unique

  • Apartments.com, LoopNet, and CoStar create unmatched CRE and rental traffic density.
  • Zonda acquisition adds new-home data, builder software, NewHomeSource, and Livabl on August 21, 2026.
  • Global marketplaces across the U.S., U.K., Canada, and Australia widen data coverage and distribution.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Life Insurance
  • Disability Insurance
  • Mental Health Support
  • Commuter Benefits
  • 401(k) Retirement Plan
  • 401(k) Company Match
  • Employee Stock Purchase Plan
  • Paid Vacation
  • Tuition Reimbursement

Company News

MarketScreener
Oct 27th, 2026
CoStar to acquire aerial imagery firm Vexcel for $730M in cash

CoStar Group has agreed to acquire Vexcel Group, which runs one of the world's largest survey-grade aerial imagery programmes, for about $730 million in cash. The deal is expected to close in the first quarter of 2027, subject to regulatory approvals. Vexcel captures more than 60 million images a year across more than 45 countries and 320 major metros. Its revenue topped $140 million over the last twelve months, up more than 30%, with an adjusted EBITDA margin of about 20%. CoStar plans to use AI to pull hundreds of data fields from imagery of about half a billion properties. It will fund the deal from cash and its revolving credit facility. Vexcel will keep its brand and leadership team, including chief executive officer Erik Jorgensen.

CoStar Group
Sep 19th, 2026
CoStar Group Completes Acquisition of Zonda, Expanding into New Home Data, Analytics and Online Marketplaces | CoStar Group

ARLINGTON, Va. – August 21, 2026 — CoStar Group, Inc. (NASDAQ: CSGP), a leading provider of online real estate marketplaces, information, analytics, and 3D digital twin technology in the property markets, announced today that it has completed its acquisition of Zonda, a leading provider of new home construction data, homebuilder software and residential real estate marketplaces, for $800 million in cash.

HousingWire
Sep 14th, 2026
CoStar names Felix Kusch president of Homes.com.

CoStar names Felix Kusch president of Homes.com. Move follows 2nd quarter 2026 residential adjusted EBITDA of $12 million and Homes.com revenue up 66% to $28.5 million Article Summary. CoStar Group appointed Felix Kusch as president of Homes.com, reporting to CEO Andy Florance. The hire follows the company's first profitable quarter in residential, with Q2 2026 adjusted EBITDA of $12 million and Homes.com revenue up 66% to $28.5 million. AI Summary CoStar Group has named European real estate portal executive Felix Kusch president of Homes.com as the company pushes to make the site the top residential real estate platform in the U.S., the company announced on Monday. Kusch joins the Arlington, Virginia-based firm from Europe, where he most recently served as CEO of Immoweb, the top real estate portal in Belgium, and Immowelt, the second-largest portal in Germany. CoStar said he will oversee the Homes.com leadership team and report directly to CoStar Group founder and CEO Andy Florance. "Felix has run two of Europe's top real estate portals and beaten some of the toughest competitors in the industry to do it, that's exactly the experience we want leading Homes.com," Florance said in the announcement. "Our model and his are the same: you win by putting the property and agent first, not by selling agent's leads to multiple agents." Before running Immoweb and Immowelt, Kusch led M&A work at Axel Springer Digital focused on European real estate marketplaces and served on the boards of Meilleurs Agents and Lamudi. "I've watched what CoStar Group has built with Homes.com from across the Atlantic, and it's the same fight I've spent my career in: earning trust by promoting the property, not shopping the lead," Kusch said in the announcement. "I've done that in Belgium and in Germany. Now I get to do it in the biggest residential real estate market in the world." The appointment comes as CoStar's residential segment posted its first profitable quarter. In the second quarter of 2026, the residential business generated $12 million in adjusted EBITDA, a $41 million improvement from the first quarter, according to the company. Homes.com revenue rose 66% year over year to $28.5 million, helped by the launch of Homes.com Ai in February and its expansion across CoStar's broader marketplace portfolio.

Business Insider
Sep 4th, 2026
RBC Capital sticks to its Hold rating for CoStar Group (CSGP).

RBC Capital sticks to its Hold rating for CoStar Group (CSGP). Sep. 4, 2026, 07:45 PM In a report released yesterday, Ashish Sabadra from RBC Capital maintained a Hold rating on CoStar Group, with a price target of $34.00. According to TipRanks, Sabadra is a 3-star analyst with an average return of 2.1% and a 55.15% success rate. Sabadra covers the Financial sector, focusing on stocks such as S&P Global, Moody's, and TransUnion. In addition to RBC Capital, CoStar Group also received a Hold from William Blair's Stephen Sheldon in a report issued on August 27. However, on August 24, Wells Fargo assigned a Sell rating to CoStar Group (NASDAQ: CSGP). Based on CoStar Group's latest earnings release for the quarter ending June 30, the company reported a quarterly revenue of $925 million and a net profit of $55 million. In comparison, last year the company earned a revenue of $781.3 million and had a net profit of $6.2 million Based on the recent corporate insider activity of 51 insiders, corporate insider sentiment is negative on the stock. This means that over the past quarter there has been an increase of insiders selling their shares of CSGP in relation to earlier this year. Last month, John W. Hill, a Director at CSGP sold 3,500.00 shares for a total of $105,735.00. Read More on CSGP:

Virginia Business
Aug 26th, 2026
CoStar monopoly lawsuits consolidated in Virginia.

CoStar monopoly lawsuits consolidated in Virginia. Four consolidated suits to be heard in Eastern District of Virginia * Four antitrust lawsuits against CoStar consolidated in Virginia federal court * Two suits were filed in Virginia, one each in California, Washington, D.C. * Lawsuits allege CoStar violated Sections 1 and 2 of Sherman Act Four antitrust lawsuits filed against Arlington County-based real estate data and analytics company CoStar Group have been consolidated in federal court in Virginia. Per court records, the U.S. Judicial Panel on Multidistrict Litigation earlier this month combined three similar suits filed earlier this year in Virginia, California and Washington, D.C. A fourth suit filed later by a CoStar customer was added to the consolidated suits, which will be heard by Judge David J. Novak for the U.S. District Court for the Eastern District of Virginia. The suits all allege CoStar participated in monopolistic practices. The initial Virginia case, Shapiro Hospitalities dba Grand & Co. v. CoStar Group, et al., was filed in the Eastern District in April. The complaint, brought forth by Shapiro Hospitalities, claims CoStar violated federal antitrust law by maintaining monopoly power as the dominant provider of commercial real estate, or CRE, online listings and information. The complaint in Shapiro alleged CoStar coerced the three largest CRE brokerages into noncompete agreements, limiting the information that could be shared with CoStar competitors and excluding any rival platform from competing without access to the information. "This is a rare case about a company that has perpetrated an anticompetitive scheme so pernicious that its own customers openly lament how it has destroyed competition, leaving them no choice but to pay its supracompetitive prices," the complaint states. The filing specifically alleges violations of Sections 1 and 2 of the Sherman Act. "By restraining customers' ability to share their own CRE information with CoStar competitors, CoStar has created and maintained a dangerous probability that its attempt to monopolize will succeed," the complaint states. In the Aug. 14 decision by the U.S. Judicial Panel on Multidistrict Litigation, the panel wrote that CoStar opposed consolidation but asked that the actions be transferred to Virginia should consolidation occur. "We find that the Eastern District of Virginia is the most appropriate transferee district for this litigation," U.S. Judicial Panel on Multidistrict Litigation Acting Chair Matthew F. Kennelly wrote. "CoStar is headquartered in this district, and most parties support centralization there, in the first instance or in the alternative." Kennelly selected Novak to preside over the consolidated action, writing that he "is familiar with the contours of multidistrict and complex litigation, and we are confident he will steer this matter on an efficient and prudent course." The cases transferred to Virginia include Malm Inc. v. CoStar Group from the Central District of California and One Real Estate, dba The One Street Co. v. CoStar Group from the District of District of Columbia. The fourth case, Oster v. CoStar Group, was filed in the Eastern District of Virginia after consolidation proceedings began. In the new filing, plaintiff Brad Oster, a New Orleans resident who has paid for a "Premium Listing Plan" and CRE listing services from CoStar, alleged similar violations of the Sherman Act. "CoStar did not achieve this dominance through superior products or competitive pricing," the complaint states. "It achieved dominance by eliminating competitors through acquisition and litigation, and then by deploying a self-reinforcing anticompetitive scheme designed to prevent any new competitor from challenging its position." CoStar has 8,400 employees and 86 offices in 15 countries. In 2025, the company reported $3.2 billion in revenue, up 19% over 2024's $2.7 billion. Its websites attracted an average of 118 million unique monthly visitors during the second quarter of this year.