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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Lead Detection & Response Platform Engineer - **Company:** Ten-X, LLC - **Location:** Richmond, VA, United States (Remote available) - **Experience:** Expert - **Salary:** $155,000.0 - $245,000.0 - **Contract:** Permanent contract - **Skills:** Active Directory, Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Microsoft Azure, Cyber Security, Query Languages, Intrusion Detection and Prevention, JSON, Python (Programming Language), Microsoft Security Essentials, Windows PowerShell, Kusto Query Language, Security Information and Event Management, Software Engineering, Microsoft Power Automate, Large Language Models, Mitre Att&ck, Git, Deployment Automation, Bicep, Restful APIs, Terraform, Software Version Control, Api Management - **Published:** October 20, 2026 - **Apply:** https://costar.wd1.myworkdayjobs.com/CoStarCareers/job/US-VA-Arlington/Lead-Detection---Response-Platform-Engineer_R40150 ## About the Role * Bachelor's Degree required from an accredited, not for profit, in person, university or college. * A track record of commitment to prior employers * One or more security certifications (e.g., GIAC GCIH, GCDA, CISSP, CISM, ECIH) * 8+ years in IT, including 5+ years in cybersecurity and at least 3 years in security operations, detection engineering or incident response * Has designed and run alert triage or incident response processes for an enterprise security operations team * Has built and maintained production security automation in a SOAR or workflow platform: playbooks, API integrations and enrichment * Proficient in Python or PowerShell, and in working with REST APIs and JSON * Proficient in at least one SIEM query language (e.g., KQL, SPL) * Has managed security content or configuration with Git and a change-control process * Has investigated across identity (Active Directory / Entra ID), endpoint, cloud and email telemetry Preferred Qualifications and Skills * Microsoft security stack: Sentinel, Defender XDR, Logic Apps, Entra ID * Detection-as-code or CI/CD pipelines for SIEM content; infrastructure as code (Terraform, Bicep/ARM) * Investigating in Azure and AWS, including cloud security posture tools * Has used LLMs in security workflows and can explain their limits and failure modes * Has defined security operations metrics and reported them to leadership * Working knowledge of NIST SP 800-61, MITRE ATT&CK and a SOC maturity model (e.g., SOC-CMM) * A record of mentoring staff or building internal training * Clear technical writing: runbooks, standards and post-incident reports ## Description 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 own and engineer the platform that CoStar Security uses to triage alerts and respond to incidents. That platform covers the SIEM, XDR, SOAR and case-management tools, and the integrations, automation and content that connect them. You will define how alerts are triaged, investigated and escalated, and then build those processes into the platform so they run the same way every time. You will also explain security concepts and decisions clearly to technical and non-technical audiences across the CoStar Enterprise. This is not a tool administration role, and it is not a software engineering role. You will set the standards for triage and incident response, measure how well the platform supports them, and improve both the process and the platform based on that data. You will mentor analysts and engineers so they can design and automate their own work. You will also coordinate incident response across the business. The successful candidate understands security operations well enough to define how the work should be done, and has the engineering skills to make the platform do it. This position can be located in Arlington or Richmond, VA and is in office Monday through Thursday and work from home on Friday. Responsibilities * Own the alert triage process: define how alerts are classified, enriched, prioritized, investigated, escalated and closed, and write these as standards that analysts can follow and that can be audited. * Build those processes into automation: SOAR playbooks, enrichment pipelines and case-management workflows that remove repetitive analyst work and make handling consistent. * Run the detection and response stack (SIEM, XDR, SOAR, case management) as a platform, keeping its configuration, content and integrations under version control with peer review, testing and automated deployment. * Measure triage and response performance (alert volume, true and false positive rates, time to triage and contain, and automation coverage) and use the data to decide what to tune, automate or retire. * Work with detection engineering and threat intelligence so every new detection ships with triage guidance, enrichment and response actions, and lessons from triage feed back into tuning. * Evaluate AI- and LLM-assisted triage, enrichment and case summaries, and adopt them only where they measurably cut analyst effort, with human review and defined guardrails. * Coordinate incident response across business units: lead significant incidents, coordinate technical, business and legal stakeholders, and follow post-incident corrective actions through to completion. * Maintain the Incident Response Plan and run quarterly tabletop exercises, turning the findings into updated playbooks and automation. * Mentor and develop analysts and engineers in process design, investigation methods and automation; review their playbooks, queries and code so the team can build its own automation rather than depend on one person. * Connect identity, endpoint, cloud, email and network telemetry and tools through APIs, and close the data-quality and coverage gaps that slow triage down. * Use MITRE ATT&CK to map detection and response coverage and set threat hunting priorities.