Security Engineer; Splunk

Coalfire Systems

Coalfire is an EEO employer. We celebrate diversity and are committed to respecting one another, embracing individual differences, and creating an inclusive environment for all employees.

Security Engineer (Splunk)

Coalfire is on a mission to make the world a safer place by solving our clients' hardest cybersecurity challenges. We work at the cutting edge of technology to advise, assess, automate, and ultimately help companies navigate the ever‑changing cybersecurity landscape. We are headquartered in Chicago, Illinois with offices across the U.S. and U.K., and we support clients around the world. But that's not who we are – that's just what we do.

We are thought leaders, consultants, and cybersecurity experts, but above all else, we are a team of passionate problem‑solvers who are hungry to learn, grow, and make a difference.

• Maintain SIEM solutions (Splunk, Sentinel, ELK, Log Rhythm, Sumo Logic) in cloud environments (AWS, Azure, GCP) to support FedRAMP continuous monitoring requirements
• Maintain and support SIEM platforms (Splunk, Sentinel, ELK, Log Rhythm, Sumo Logic) in AWS, Azure, and GCP environments to support continuous monitoring and compliance requirements
• Manage and maintain log collection infrastructure including forwarders, collectors, and ingestion pipelines across hybrid environments
• Support SIEM performance tuning, storage management, retention settings, and licensing optimization under established operational guidelines
• Implement and maintain log retention and audit configurations aligned with FedRAMP and other compliance framework requirements
• Develop, tune, and maintain detection rules, correlation searches, and alerting logic to identify security events
• Create and maintain custom parsers and field extractions for complex or proprietary log sources
• Reduce false positives through ongoing rule tuning, baseline analysis, and detection improvement efforts
• Participate in peer reviews of detection rules and SIEM configuration changes
• Monitor SIEM alerts and investigate security events to support incident response and threat hunting activities
• Contribute to development and maintenance of detection and response playbooks and operational procedures
• Support troubleshooting of SIEM ingestion, parsing, and performance issues
• Work with infrastructure and application teams to onboard new log sources and improve security visibility
• Collect and organize SIEM control evidence and artifacts for audits and 3
  
  PAO assessment activities
• Ensure SIEM configurations support required controls such as audit review, log integrity, and time synchronization
• Create and maintain SIEM architecture, detection, and operational documentation and runbooks
• Provide technical support during client reviews and operational meetings as assigned
• Share knowledge and provide guidance to junior team members
• Contribute to process improvement and automation initiatives within SIEM and detection workflows

• 3+ years of hands‑on systems engineering and architecture experience—including requirements definition, architecture development, use‑case/story creation, and systems integration/testing.
• 3+ years of cloud experience in architecture, design, implementation, operations, and automation (AWS, Azure, or GCP).
• Proven expertise with SIEM platforms (e.g., Splunk, Sentinel, ELK, Log Rhythm, Sumo Logic) and enterprise antivirus (AV) solutions (e.g., Trend Micro, Crowd Strike, Microsoft Defender).
• Understanding of AWS, Azure, or GCP platform capabilities (ideally as a Cloud Architect, Cloud Dev Ops Engineer, or Cloud Security Engineer).
• Experience working in Agile environments with technical teams of three or more individuals.
• Excellent communication, organizational, and problem‑solving skills, with the ability to convey complex technical information clearly.
• Strong documentation skills for creating technical diagrams, written descriptions, and other supporting materials.
• Demonstrated ability to work both independently and as a member of a team, maintaining a professional attitude and demeanor.
• Critical thinking skills to balance robust security requirements against mission objectives.
• Proven track…