Red Team - Security Researcher III

F5
Warsaw
Workplace: HybridFull timeFunction: Research & Scientific (R&D)Experience: 5-8 yearsSkills: ["Communication","Problem-solving","Leadership"]

Senior Security Researcher responsible for threat hunting and penetration testing of internet-facing traffic management and security platforms. Works with Office of the CISO, engineering, security and GRC teams to strengthen posture of large-scale systems. Will develop hypotheses based on MITRE ATT&CK, leverage EDR/XDR tools, analyze intrusions, and produce executive-friendly reports while mentoring junior analysts.

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F5
F5
3 months ago

Red Team - Security Researcher III

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Last checked: 7 days agoStatus: Live

Job Summary

Senior Security Researcher responsible for threat hunting and penetration testing of internet-facing traffic management and security platforms. Works with Office of the CISO, engineering, security and GRC teams to strengthen posture of large-scale systems. Will develop hypotheses based on MITRE ATT&CK, leverage EDR/XDR tools, analyze intrusions, and produce executive-friendly reports while mentoring junior analysts.
Location: Warsaw
Workplace: Hybrid
Employment Type: Full time
Job Function: Research & Scientific (R&D)
Seniority: Sr. Manager level

Key Responsibilities

  • •Conduct proactive, intelligence‑driven threat hunts across endpoint, network, SaaS, and cloud data to identify activity that evades traditional security controls
  • •Develop and test hunt hypotheses based on MITRE ATT&CK, adversary TTPs, and emerging/vulnerabilities
  • •Familiarity with CrowdStrike Falcon and/or Netskope telemetry to detect suspicious behaviors, lateral movement, and data exfiltration patterns
  • •Perform deep technical analysis of intrusions, malware, and tools; reconstruct attack chains and identify root cause and detection gaps
  • •Contribute to detection logic, advanced queries, and automation to operationalize hunt findings at scale

Key Requirements

  • •5–8+ years of hands-on cybersecurity experience (pentesting, IR, threat hunting, or threat intel) including ownership of complex investigations
  • •Strong proficiency with at least one EDR/XDR platform, preferably CrowdStrike Falcon and/or Netskope
  • •Deep understanding of Windows and Linux internals, networks, and attacker tradecraft (persistence, lateral movement, credential access, C2)
  • •Experience building and running hunts using SIEM/log platforms (e.g., Splunk, LogScale, Elastic, Sentinel) and writing complex queries for anomaly detection
  • •Solid working knowledge of MITRE ATT&CK and its use in structuring hunts and mapping detections
Experience:5-8 yearsCybersecurityThreat huntingIncident responsePentesting
Skills:CommunicationProblem-solvingLeadership
Certifications:GCTIGCIAGCFAGNFAGREMOSCPCRTO
Languages:English
Tech Stack:CrowdStrike FalconNetskopeMITRE ATT&CKSplunkPowerShellPythonKQLSQL

Company Brief

F5
Provides application delivery networking, load balancing, and security solutions for on-premises and cloud environments, helping organizations optimize, secure, and scale applications and APIs across multi-cloud infrastructures.
Industry: Networking Equipment
Company Size: Enterprise (1,001+ employees)
Revenue: USD 1B+
Growth: Public Company
Valuation: Public Company (Market Cap in USD)
Funding: IPO / Publicly Listed
Headquarters: Seattle, United States
Founded: 1996
Glassdoor
Glassdoor: 3.8
WebsiteLinkedIn