Cybersecurity Engineer – Elastic SIEM SME

About the role

Maximus is seeking a Cybersecurity Engineer – Elastic SIEM SME. This role is on-site in San Antonio, TX and requires an active TS/SCI security clearance.

Responsibilities

• Serve as the Elastic SIEM subject matter expert, exercising independent technical judgment and advising the team and customer.
• Provide expert technical direction for the architecture, operation, and sustainment of the Elastic SIEM platform (Elasticsearch, Kibana, Logstash, Beats/Elastic Agent) across NIPRNet, SIPRNet, and JWICS environments.
• Monitor SIEM health, perform capacity planning, and lead resolution of the most complex platform outages and degradations in accordance with defined SLAs.
• Guide the design and review of detection rules, alerts, dashboards, and visualizations in Elastic to support DCO mission requirements.
• Ingest, normalize, and validate log data from diverse sources including endpoint, network, cloud, and application telemetry.
• Collaborate with cyber operators and analysts to support threat detection, alert triage, and cyber incident investigation workflows.
• Identify opportunities to improve SIEM coverage, data quality, and detection fidelity; lead implementation of improvements in coordination with the Government PMO.
• Support Cyber Security Service Provider (CSSP) activities including continuous monitoring and security event analysis.
• Create and maintain technical documentation including runbooks, standard operating procedures (SOPs), and knowledge base articles.
• Advise the customer and mentor senior and journeyman engineers; establish technical standards and review complex SIEM designs.
• Participate in Agile/SAFe Program Increment (PI) planning and sprint execution in support of platform delivery.
• Adhere to Air Force cybersecurity standards and all applicable DoD, IC, and USAF policy and directives across all enclaves.

Requirements

• Active Top Secret / SCI (TS/SCI) security clearance.
• Bachelor's degree in Cybersecurity, Computer Science, Information Technology, or related field.
• 10+ years of hands-on cybersecurity engineering experience.
• Advanced proficiency level: demonstrated expertise in Elastic SIEM architecture, technical standards, complex troubleshooting, and advising technical teams and customers.
• Demonstrated hands-on experience with Elastic Stack (Elasticsearch, Kibana, Logstash, Beats/Elastic Agent) in an operational SIEM environment.
• Experience supporting threat detection, alert triage, and/or cyber incident investigation.
• Familiarity with DCO concepts, CSSP operations, and defensive cyber frameworks.
• Experience working across multiple network security domains (NIPR, SIPR, or JWICS).
• Meet applicable DoD 8140 requirements for the assigned work role.
• DCWF 521, Cyber Defense Infrastructure Support Specialist, Advanced Proficiency.

Skills

• Experience with SI