# Lead Detection & Response Platform Engineer at CoStar Group

- Company: CoStar Group
- Company website: https://www.costargroup.com
- Type: Startups
- Level: Senior
- Location: US-VA Arlington
- Work setup: On-site
- Pay: $155K to $245K base salary per year (USD)
- Posted: 2026-10-19
- Apply by: 2026-12-03
- Apply: https://costar.wd1.myworkdayjobs.com/en-US/CoStarCareers/job/US-VA-Arlington/Lead-Detection---Response-Platform-Engineer_R40150?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/costar-group-lead-detection-and-response-platform-engineer/

## About the role

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. Found on 1752vc Careers, the job board for startup and VC roles.

## What they're looking for

- 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


Source: 1752vc Careers, https://www.1752.vc/careers/jobs/costar-group-lead-detection-and-response-platform-engineer/