SIEM Engineer

Job#: 3031010

Job Description:

Job Title: Senior Splunk Enterprise Security (ES) SIEM Engineer

Location: Alexandria, VA

Clearance: TS/SCI (must be eligible to obtain or maintain)

***If interested, please send a copy of your resume to Sara at

Position Overview

The Senior Splunk Enterprise Security professional serves as a subject matter expert for designing, implementing, tuning, and maintaining Splunk Enterprise and Enterprise Security to support enterprise-level security monitoring, threat detection, and incident response. This role works closely with security engineering, SOC operations, threat intelligence, and IT infrastructure teams to enhance visibility, strengthen detection capabilities, and ensure the overall effectiveness of SIEM operations.

Key Responsibilities

Architect, deploy, and administer Splunk Enterprise Security in a large-scale, distributed environment

Develop and optimize correlation searches, risk-based alerting (RBA) models, dashboards, data models, and notable events

Lead onboarding, parsing, normalization, and CIM mapping for diverse security and IT data sources

Conduct health checks, performance tuning, and capacity planning for Splunk indexers, search he Install, configure, and maintain Splunk Enterprise components: indexers, search head clusters, deployment servers, heavy forwarders, and universal forwarders

Administer and optimize clustered Splunk environments for performance, resiliency, and scalability

Configure and manage data onboarding, parsing, props/transforms, index creation, retention policies, and storage planning ads, and cluster environments

Enhance detection engineering by creating advanced detection logic for TTPs aligned to MITRE ATT&CK

Collaborate with SOC analysts to operationalize detections and automate workflows via SOAR (if applicable)

Monitor and improve data ingestion pipelines and troubleshoot indexing or search performance issues

Maintain documentation, playbooks, and engineering standards for Splunk ES environments

Mentor junior analysts/engineers and provide SME guidance during incidents and threat hunting activities

Ensure compliance with enterprise security policies, regulatory frameworks, and audit requirements

Manage distributed configurations using deployment server, cluster master, or deployment tools

Implement best practices for system security, hardening, and compliance requirements

Collaborate with ES and SOC teams to ensure data readiness and platform reliability for security operations

Automate routine administrative tasks using scripts (Python, Bash, PowerShell)

Maintain documentation for architecture, configuration standards, data onboarding, and operational procedures

Provide mentorship and SME-level technical guidance to Splunk users and junior administrators

Required Qualifications

Bachelor's degree in Cybersecurity, Computer Science, IT, or related field (or equivalent experience)

5-10+ years of hands-on experience with Splunk Enterprise and Splunk ES

Strong expertise in SPL query design, dashboards, macros, and data model acceleration

Proven experience with CIM mapping, data ingestion onboarding, and parsing using props/transforms

Understanding of SIEM operations, SOC workflows, and threat detection methodologies

Knowledge of security tools (EDR, FW, IDS/IPS, cloud logs, vulnerability scanners, IAM logs, etc.)

Familiarity with Linux/Unix systems, networking protocols, and cybersecurity fundamentals

Ability to guide incident response activities and provide SME-level support

Strong knowledge of Splunk architecture, clustering, indexing, and search optimization

Experience with configuration files (props.conf, transforms.conf, inputs.conf, outputs.conf)

Proficiency in Linux/Unix administration and system troubleshooting

Hands-on experience with data ingestion, parsing, and log pipeline troubleshooting

Familiarity with networking concepts (TCP/UDP, syslog, load balancing, SSL certificates)

Experience with role-based access controls and authentication integrations

Ability to lead Splunk upgrades, migrations, and architectural improvements

Preferred Qualifications

Splunk certifications (Architect, Consultant, ES Analyst, Core Certified Power User, etc.)

Experience with Splunk SOAR (Phantom) for automation

Expertise with MITRE ATT&CK-aligned detection development

Scripting/automation experience (Python, Bash, PowerShell)

Experience in cloud security logging (AWS, Azure, Google Cloud Platform)

Background supporting federal government or regulated industries

Soft Skills

Strong analytical and problem-solving abilities

Excellent communication and documentation skills

Ability to lead and mentor teammates

Comfortable working in a dynamic SOC or security engineering environment

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at or .

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.