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CoStar Group
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September 27, 2025
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Web App Pen Tester (San Diego or Irvine)

San Diego, CA
Full-time
Onsite
$114K/yr - $204K/yr
Entry, Mid Level
CoStar Group is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. In this role, you will secure software and applications that power the worldwide real estate market, collaborating with teams to drive secure application development and deployment.
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Responsibilities

  • Conduct penetration tests on web applications and underlying infrastructure for vulnerabilities using both manual and automated techniques
  • Demonstrate risk of detected issues to both technical and non-technical audiences
  • Work with the software and product teams to help ensure applications are designed and implemented securely during the SDLC
  • Consume a variety of application security tools (DAST, SAST, SCA, Credential Scanning, IAC scanning) to secure web applications during development and production run-time
  • Utilize sustainable methods to automate finding feedback to generate developer work items and trigger re-scan when associated work items are closed
  • Recommend code changes to eliminate vulnerabilities
  • Automate security testing at various stages within the CI/CD pipeline

Qualification

Required

  • Bachelor’s Degree required from an accredited, not for profit university or college (preferably in Computer Science/Cybersecurity)
  • A track record of commitment to prior employers
  • Minimum 1 to 3 years total experience in a technical role with at least 1 year of professional experience penetration testing
  • Experience with web application penetration testing, identifying and exploiting attack chains to evaluate the severity of vulnerabilities within a web application
  • Experience writing comprehensive reports that clearly demonstrate the risk of vulnerabilities to developers and technical leadership
  • Experience with defense-in-depth strategies to help mitigate existing risk within applications
  • Experience with common programming language: C# (preferred), Java, C/C++, Python, or Go
  • Scripting/programming skills - Python, PowerShell, GoLang, Perl, JavaScript, .NET, API Integration
  • Security tooling automation in CI/CD pipelines and IDE interfaces including Static Application Security Testing (SAST) and Static Application Analysis (SCA) solutions such as Veracode, CheckMarx, AppScan, X-Ray, Synopsys, or Snyk
  • Dynamic application security testing (DAST) through Metasploit, Burp Suite, OWASP ZAP, Acunetix, etc.
  • Industry relevant professional certifications such as: Offensive Security Web Assessor (OSWA) / Expert (OSWE), Offensive Security Certified Professional (OSCP) / Experienced (OSEP), Hack the Box Bug Bounty Hunter (CBBH) / Web Exploitation Expert (CWEE), Hack the Box Penetration Testing Specialist (CPTS) / AD Pentesting Expert (CAPE), INE Security Web Application Penetration Tester eXtreme (eWPTX)
  • Those certifications can be substituted with considerable experience in CTFs, impressive CVEs, or impressive bug bounty reports.

Preferred

  • In-depth understanding of various assessment tools
  • Knowledge of infrastructure operations across databases, network, and system administration
  • Ability to communicate with different levels of leadership conveying risk and driving urgency for risk remediation
  • Experience coordinating with application teams to drive security by design principles
  • Ability to mentor and train team members to prioritize security efforts effectively
  • A self-starter who can advance the application security program and follow-through ideas to completion
  • Passionate about cyber security keeping up with latest trends in the threat landscape
  • Hands-on experience implementing security tools into CI/CD pipelines
  • Experience testing modern applications in cloud-native tech stacks
  • Experience with mobile application penetration testing

Benefits

  • 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 Diversity, Equity, & Inclusion Employee Resource Groups
  • Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks
CoStar Group (NASDAQ: CSGP) is the provider of commercial real estate information, analytics and marketing services.
Glassdoor
2.9
Founded in 1987
Arlington, Virginia, USA
5001-10000 employees
http://www.costargroup.com/
CoStar Group (NASDAQ: CSGP) is the provider of commercial real estate information, analytics and marketing services.
Glassdoor
2.9
Founded in 1987
Arlington, Virginia, USA
5001-10000 employees
http://www.costargroup.com/
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