Senior System Engineer (Cybersecurity/RMF)

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DARNELL JACKSON

************@*****.*** 321-***-**** St. Cloud, FL 34773 Online Profile

Results-driven Senior System Engineer with a strong focus on cybersecurity frameworks and risk management. Skilled in conducting vulnerability assessments and collaborating with cross-functional teams to enhance system security and compliance. Committed to improving organizational security posture through effective implementation of security controls.

Lockheed Martin Orlando, FL

Senior System Engineer

04/2022 - Current

Provide Tier III / SDE-level system engineering support for enterprise and mission-critical environments supporting classified and unclassified programs.

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Administer and maintain Active Directory (multi-domain forest environment), including OU design, delegation, trusts, and replication troubleshooting.

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Design, implement, and manage Group Policy Objects (GPOs) to enforce STIG-compliant security baselines across Windows Server and workstation environments.

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Conduct security analysis and vulnerability assessments in accordance with NIST 800-53, RMF, and DoD STIG requirements.

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Applied and validated DISA STIG compliance across Windows and Linux systems to maintain DoD security baselines and improve system security posture.

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Supported Risk Management Framework (RMF) activities by assisting with security control implementation, compliance documentation, vulnerability remediation, and audit readiness in accordance with NIST 800-53 and DoD requirements.

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Collaborated with cross-functional engineering teams using Agile methodologies to implement secure infrastructure changes and maintain project deliverables.

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L3 Harris Orlando, FL

NOC / SOC Engineer

12/2019 - 08/2022

Utilized Splunk and enterprise monitoring tools to investigate security events, analyze system logs, identify anomalies, and escalate potential cybersecurity incidents.

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Assisted with incident response activities by collecting logs, performing initial triage, documenting findings, and coordinating with senior cybersecurity analysts during investigations.

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Supported system hardening initiatives by applying and validating security configurations using STIGs and CIS Benchmarks across Windows and virtualized environments.

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Assisted with vulnerability management activities by reviewing security scan results from tools such as Nessus and supporting remediation efforts in accordance with DoD security requirements.

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Contributed to RMF compliance activities by assisting with security documentation, vulnerability tracking, POA&M updates, and

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Summary

Experience

implementing security controls aligned with NIST 800-53 and DoD guidance.

Monitored and maintained VMware vSphere/ESXi virtual environments, performing routine administration, system health monitoring, and virtual machine lifecycle support.

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Worked with Linux and Windows servers to perform system administration, log analysis, patch validation, and security troubleshooting.

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Assisted with Active Directory administration, account management, group policy implementation, and access control in accordance with least- privilege principles.

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Supported secure system deployment by validating security baselines, performing configuration reviews, and assisting with vulnerability remediation prior to production releases.

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Collaborated with cross-functional engineering and cybersecurity teams using Agile workflows and tools such as JIRA and Confluence to document issues, track remediation efforts, and support project deliverables.

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Leveraged AI-powered tools, including OpenAI-based solutions, to improve documentation quality, automate routine technical tasks, summarize security findings, and accelerate research during troubleshooting efforts.

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Participated in evaluating AI-generated technical outputs to ensure accuracy, compliance, and alignment with cybersecurity best practices before operational use.

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INOC LLC Wisconsin Rapids, WI

Systems Analyst

01/2018 - 12/2019

Utilized Python, PowerShell, and Bash scripting for automating log parsing, alert enrichment, and basic security data analysis in a SOC environment

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Applied network design principles with focus on security architecture, risk mitigation, and operational requirements to support secure system deployments

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Leveraged cloud security knowledge (AWS, IAM, security groups, logging) aligned with industry frameworks (e.g., CSA, CCSP concepts) to monitor and secure cloud environments

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Performed incident response and recovery within an Information Security Operations Center (ISOC), handling triage, containment, and remediation of security events

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Analyzed malware using static (hashing, strings, signatures) and dynamic

(sandboxing, behavior analysis) techniques to identify IOCs and threat patterns

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Correlated indicators of compromise (IOCs) with threat intelligence feeds to enhance detection and improve incident investigation accuracy

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Supported detection and monitoring efforts using SIEM and EDR tools to identify anomalous activity across network and endpoint environments

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Collaborated with cross-functional teams to document incidents, improve response playbooks, and strengthen overall security posture

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Food First (Contract) Remote Orlando, FL

Software Engineer

01/2018 - 11/2018

Developed UI components for POS interfaces to enhance usability, responsiveness, and transaction workflows in high-volume environments

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Integrated RESTful APIs for payment gateways, inventory systems, and third-party restaurant platforms to facilitate seamless transaction processing

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Developed and maintained POS features (order entry, payment processing, receipt generation) using languages such as Java, C#, or JavaScript in a

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client-server architecture

Optimized SQL queries for menu management, order tracking, and reporting within relational databases (MySQL, PostgreSQL) to improve data retrieval efficiency

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Maintained version control using Git and participated in code reviews to ensure code quality, consistency, and adherence to development standards

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Southern Utah University Cedar City, UT

Master of Science in Cyber Security

Expected in 07/2027

American InterContinental University Schaumburg, IL Bachelor of Science

08/2025

• Comptia Server +

• Comptia Security +

• Comptia Network +

• Microsoft Azure

• Comptia Cysa+

Education/Training

Certifications & Licenses

Contact this candidate