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Sr. Network Security Engineer
Masterapp LabsMechanicsville, VA🇺🇸United StatesPosted 3 Aug 2026
Quick Overview
Work Type
On Site
Level
Mid Senior
Job Description
Title: Sr. Network Security Engineer
Location: Mechanicsville, VA (Onsite)
Position Type: Contract
Interview Mode: In-person
Key Responsibilities:
- Ensures network security architecture aligns with operational security standards prior to and after deployment.
- Lead investigation and containment of network security incidents.
- Review firewall rule requests and ensure compliance with security standards.
- Design and maintain secure hybrid network architecture across on-premises and Azure environments.
- Monitor security events using SIEM technologies and coordinate incident response activities.
- Perform network security assessments and recommend remediation strategies.
- Develop and maintain network security standards, diagrams, and operational documentation.
- Support penetration testing and remediation efforts.
- Participate in on-call support during critical security incidents.
- Responsible for conducting proactive threat hunting and anomaly detection.
- Validates WAF and firewall placement and integration exposure/connectivity. Also leads implementation, review, and management of agency WAF(s).
- Identifies and diagnoses system problems and threats by using system logs, line monitors, SIEM, diagnostic software, and test equipment.
- Identifies, prioritizes, and remediates network security vulnerabilities.
- Must have the ability to provide documentation, network architecture topology diagrams, IP schemes, firewall rules, and access controls when required.
- Must have the ability to work independently on assigned projects.
Required/Desired Skills
|
Skill
|
Required /Desired
|
Amount
|
Actual Years of Experience
|
|
Enterprise Networking
|
Required
|
8
|
|
|
Enterprise Security
|
Required
|
5
|
|
|
Azure Networking
|
Required
|
3
|
|
|
WAF/NGFW
|
Required
|
3
|
|
|
Supporting environments with 300+ Network Devices
|
Desired
|
3
|
|
|
Candidate must have experience in the following areas: Incident response, Security investigations, Log analysis, Threat intelligence, Security monitor
|
Required
|
|
|
|
Candidate must have experience with the SIEM products (e.g. Splunk, Microsoft Sentinel)
|
Required
|
|
|
|
Candidate must have experience in vulnerability management and remediation tracking as well as vulnerability scanning tools (e.g. Nessus, Tenable, Def
|
Required
|
|
|
|
Candidate must have experience in the following areas: Active Directory, MFA, Conditional Access, Certificates
|
Required
|
|
|
|
Candidate must have experience with; SEC530, CIS Benchmarks, NIST CSF, NIST 800-53, Zero Trust principles
|
Required
|
|
|
|
Candidate must have experience with the following: Cisco ISE, NAC, 802.1X, RADIUS, TACACS
|
Required
|
|
|
|
Candidate must have experience with the following products: Palo Alto, F5 Distributed Cloud, Azure WAF, Cisco VPN, Global Protect, F5 BIG-IP
|
Required
|
|
|
|
Candidate must have experience working in highly regulated environments and leading technical troubleshooting during outages
|
Required
|
|
|
|
Candidate must have ability to communicate technical issues to technical and executive audiences and an ability to mentor junior engineers.
|
Required
|
|
|
|
Candidate should have achieved or ability to achieve the following certifications: Azure Security Engineer (AZ-500), Azure Network Engineer (AZ-700),
|
Required
|
|
|
Skills
MFA
Splunk
Active Directory
Azure
Penetration Testing
WAF
Zero Trust
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