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Senior Web App Pen Tester (San Diego or Irvine)
full-timeIrvine, San Diego$114k - $203k

Summary

Location

Irvine, San Diego

Salary

$114k - $203k

Type

full-time

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About this role

Senior Web App Pen Tester (San Diego or Irvine)

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Job Description

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Overview

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces.  Included in the S&P 500 Index and the NASDAQ 100, 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.   

In this role, you will secure software and applications that power the worldwide real estate market. Work with 1,000+ software, QA, and operations engineers to secure applications during design, development, and production. The candidate will utilize threat modeling, white box application security analysis, and grey box penetration testing. This position will collaborate with software development teams, DevOps, and security to drive and shape the way our employees and engineers build, deploy, and operate applications.

This position is located in San Diego, CA or Irvine, CA and is in office Monday through Thursday and work from home on Friday.

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

Basic Qualifications

  • 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 
  • 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 Qualifications and Skills

  • 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

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 Diversity, Equity, & Inclusion Employee Resource Groups
  • Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

This position offers a base salary range of 114,200 - 203,500 based on relevant skills and experience and includes a generous benefits plan.

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-AR

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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

Other facts

Tech stack
Penetration Testing,Threat Modeling,Application Security,CI/CD Automation,Scripting,Programming,Security Tools,Risk Assessment,Vulnerability Management,Web Applications,Cloud Technologies,Mobile Applications,Technical Communication,Mentoring,Cyber Security Trends,Infrastructure Operations

About CoStar

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.

Team size: 5,001-10,000 employees
LinkedIn: Visit
Industry: Real Estate

What you'll do

  • Conduct penetration tests on web applications and underlying infrastructure to identify vulnerabilities. Collaborate with software development teams to ensure secure application design and implementation.

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Frequently Asked Questions

What does CoStar pay for a Senior Web App Pen Tester (San Diego or Irvine)?

CoStar offers a competitive compensation package for the Senior Web App Pen Tester (San Diego or Irvine) role. The salary range is USD 114k - 204k per year. Apply through Clera to learn more about the full compensation details.

What does a Senior Web App Pen Tester (San Diego or Irvine) do at CoStar?

As a Senior Web App Pen Tester (San Diego or Irvine) at CoStar, you will: conduct penetration tests on web applications and underlying infrastructure to identify vulnerabilities. Collaborate with software development teams to ensure secure application design and implementation..

Why join CoStar as a Senior Web App Pen Tester (San Diego or Irvine)?

CoStar is a leading Real Estate company. The Senior Web App Pen Tester (San Diego or Irvine) role offers competitive compensation.

Is the Senior Web App Pen Tester (San Diego or Irvine) position at CoStar remote?

The Senior Web App Pen Tester (San Diego or Irvine) position at CoStar is based in Irvine, California, United States and San Diego, California, United States. Contact the company through Clera for specific work arrangement details.

How do I apply for the Senior Web App Pen Tester (San Diego or Irvine) position at CoStar?

You can apply for the Senior Web App Pen Tester (San Diego or Irvine) position at CoStar directly through Clera. Click the "Apply Now" button above to start your application. Clera's AI-powered platform will help match your profile with this opportunity and guide you through the application process. You can also learn more about CoStar on their website.