Randall Chains, Developer in Millsboro, United States
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Randall Chains

Verified Expert  in Engineering

SecOps Developer

Millsboro, United States
Toptal Member Since
January 30, 2023

Randall is a cybersecurity professional with nearly a decade of security operations experience with federal and state governments. He has worked for several commercial clients with great success. Randall previously worked in a network operations capacity for multiple international telecoms.



Preferred Environment


The most amazing...

...client network and security issues I've resolved provided great value value to the companies involved.

Work Experience

Security Operations Engineer

2012 - 2021
  • Led operational security activities. Planned and organized the daily workload. Delegated work and provided led to accomplish missions on time. Experienced DoD cybersecurity, NIST, and a risk management framework in network information security.
  • Set up firewall rules, configuration changes, network, and VPN creation. Maintained an SoC environment. Led incident monitoring. Investigated and responded utilizing SIEM tools and open-source intelligence (OSINT) for daily reports and updates.
  • Managed SoC ops to provide timely analysis, identification, remediation, escalation, and produce reports of security incidents. Conducted vulnerability scanning and reports, incident response, triage, escalation, and recommendations.
  • Conducted risk assessments and remedial plans. Designed SSL/VPN solutions for the Marine Corps enterprise network to fit into information assurance suites. Provided network and security operations support for garrison and field operations.
  • Provided a change management request and management for software and application, and hardware upgrades. Enhanced network element performance and resource utilization. Ensured daily activities were aligned with company policies and objectives.
  • Performed regular security and risk assessments, analysis of network and systems-related security events, and risk mitigation. Maintained complex security systems according to industry best practices to safeguard data, networks, and systems.
  • Managed incident response utilizing Splunk, ArcSight, Sguill, Kibana, Fidelis Network Command Post, and open-source intelligence (OSINT). Researched and analyzed incidents. Identified significant factors and gathered pertinent data.
  • Set up MSSP operations, firewalls, VPN, TCP/IP, and network troubleshooting. Protected, prevented, and detected threats, risks, vulnerability assessments, and management.
  • Worked with DoD and the Federal government's information security environment. Orchestrated SoC and international telecom network operation centers (NOC) environments. Provided confidentiality, integrity, availability, and best industry practices.
  • Directed tasks and schedules. Ensured timely and proper application of network and security maintenance on assets and infrastructure according to established guidelines and vendor instructions.
Technologies: Network Security, Security Policies & Procedures, Policies & Procedures Compliance, Security, IT Security, Policy Development, IT Management, SIEM, SecOps

Firewall Upgrades

Worked in a managed security service provider's (MSSP) capacity, SoC firewall upgrade project, a firewall firmware upgrade of over 500 firewalls, and rebuilding end-of-life firewalls. These upgrades and rebuilds are continuously ongoing projects as clients come and go.
2016 - 2018

Master's Degree in Cybersecurity Technology

University of Maryland Global Campus - College Park, Maryland










Industry Expertise

Cybersecurity, Network Security






CISSP, Security Policies & Procedures, Policies & Procedures Compliance, Security, IT Security, Policy Development, IT Management, SecOps, Critical Infrastructure, Networking, Incident Response, Incident Management, Firewalls, Risk Analysis, Managed Security Service Providers (MSSP), Cisco, ASA, Business Continuity & Disaster Recovery (BCDR), IT Service Management (ITSM), Certified Ethical Hacker (CEH), SIEM

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