Open To Work
Derrick Sakyi
Stafford,VA
Summary
OT Cybersecurity Specialist with a strong background in ICS/OT, automation systems, and technical troubleshooting experience across complex environments. I am skilled at performing system assessments, identifying vulnerabilities, and implementing solutions that strengthen security and maintain operational uptime.
Overview
12
12
years of professional experience
1
1
Certification
Work History
Cybersecurity OT Specialist
Chinook Systems
02.2025 - Current
- Perform detailed technical analysis of Industrial Control Systems (ICS) and integrate cybersecurity solutions to enhance operational resilience.
- Conduct inventories, site surveys, and risk assessments for critical infrastructure environments including HVAC, BAS, CCTV, access control, SCADA, and PLC-based OT networks.
- Identify operational vulnerabilities and implement modifications, upgrades, or mitigations aligned to NIST CSF, NIST SP 800-82, and ISA/IEC 62443 guidance.
- Perform ICS/OT system hardening, patch validation, secure configuration baselining, and vulnerability remediation across Windows servers, HMIs, historians, and field devices.
- Monitor security events and system performance, providing corrective action recommendations to reduce cyber-physical risk.
- Support improved segmentation between IT and OT environments using VLANs, firewalls, and VPN technologies.
- Assist with implementing cybersecurity controls and documentation to support RMF, NERC CIP, and federal cybersecurity requirements.
HVAC Controls Technician
Johnson Controls Federal Systems
01.2023 - 02.2025
- Perform preventive maintenance, repair, install, commissioning, point-to-point checkouts, troubleshoot and/or replace HVAC controls systems & equipment, building control systems, and occasionally fire/security systems; most work will involve Johnson Controls Metasys building automation system and controls
- Diagnose and repair electronic control system malfunctions primarily using electronic or digital control systems
- Test and write modifications to systems software
- Assist with field changes and discrepancies for engineering corrections and drawings
- Provide training and associated manuals and documentation to customers on electronic control systems operations
- Help mechanical staff troubleshoot issues
- Ensure work performed complies with company, state, local and federal regulations, industry standards and guidelines, and customer requirements
- Properly complete all required company, customer, and service documentation
- Compile project documentation, such as certificate of completion, customer training forms, training certificates and punch lists
- Conduct self-study (reading, research and practice) to improve and maintain technical proficiency in company's product lines; completes certifications as required
- Use electronic test equipment to troubleshoot problems during installation
- Read and properly interpret blueprints, diagrams, submittals, specifications, software/systems programs, schematics and operational product manuals
- Adhere to Johnson Controls and customer safety standards, provide safety awareness leadership and instruction to technicians and subcontractors on Johnson Controls work site.
Technical Support Specialist
Prince William County Schools
04.2021 - 10.2022
- Work collaboratively with all stakeholders
- Serve as support between office of Information Technology Services (ITS) and end users at assigned location and redirect all issues that cannot be resolved at site to appropriate ITS group for assistance
- Install pre-package software or drivers required for access to hardware
- Provide training, tools, and support in new and emerging technologies
- Utilized Network Protocols such as BGP, TCP/IP, HTTPS, LDAPs
- Ensure workstations at assigned locations meet current Workstation Checklist standards
- Perform onsite analysis, diagnosis, and resolution of all levels of technology for end user, recommend and implement corrective solutions
- Managed security operations for 600+ computers in network, related systems and maintenance protocols.
HVAC Technician
Prince William County Schools
12.2015 - 04.2021
- Perform skilled work in operating, maintaining, and repairing electrical systems, circuits, and other mechanical maintenance work in County buildings, facilities, and equipment
- Demonstrated ability to use Building Automation Systems (BAS); control equipment remotely, programming control boards, and pulling/testing networking wires.
- Installed Honeywell, Siemens, Johnson Controls, and Niagara hardware, completed software updates and assessed security patches for optimized computer use.
- Maintains and repairs building utility systems, such as electrical wiring and controls, heating, ventilation, air-conditioning, and steam generating systems
- Prepares variety of reports and maintains records to support data
- Operates special electrical test equipment and analyzes devices in safe and responsive method to determine potential systems or equipment failures
- Maintained and repaired industrial chillers/boilers weighing up to 10 tons
Filter Technician
Prince William County Public Schools
06.2013 - 12.2015
- Kept operations in compliance with company, safety and legal requirements.
- Communicated processing instructions to other workers.
- Took samples every 60 days to compare quality with specifications.
- Completed frequent inspections to identify and resolve problems affecting performance.
Education
High School Diploma - undefined
Gar-Field High School
Woodbridge, VA06.2008
Skills
- Microsoft Office 365
- Industrial Network Architecture
- SCCM
- Network Protocol TCP/IP
- Server
- Installation And Configuration
- Network Operations
- Hardware and Software Monitoring
- SCADA/DCS/PLC/HMI
- Commissioning / Re-commission
- Diagnose and Repair
Certification
- CompTIA Network+
- CompTIA Security+
- Niagara N4 Certification
- IEC 62443 (in progress)
Work Preference
Work Type
Full TimeLocation Preference
HybridOn-SiteRemoteTimeline
Cybersecurity OT Specialist
Chinook Systems
02.2025 - Current
HVAC Controls Technician
Johnson Controls Federal Systems
01.2023 - 02.2025
Technical Support Specialist
Prince William County Schools
04.2021 - 10.2022
HVAC Technician
Prince William County Schools
12.2015 - 04.2021
Filter Technician
Prince William County Public Schools
06.2013 - 12.2015
High School Diploma - undefined
Gar-Field High School