Contract Remote Security Engineer Jobs in Virginia

Senior Network/Security Engineer

Job Number: 793

This is a remote position.

Ad Hoc is a technology company that empowers organizations to deliver scalable, impactful digital services. Using modern, agile methods, our team creates products that meet people’s needs and transform their experience of government.

Work on things that matter

Our collaborations have shaped some of the defining moments in public-sector service delivery. We’ve helped build products that connect Veterans to tailored services, help millions access affordable health care, and support important programs like Head Start. As we work with agencies to deliver critical services, we’re also changing how the government approaches technology.

Built for a remote life

Our culture, communications, and tools are built for remote work, enabling us to bring together top talent nationwide. At Ad Hoc, remote life empowers our teams to design work environments that fit their lives and that foster flexibility and collaboration to achieve positive outcomes for our customers.

Committed to high expectations and a welcoming culture

Ad Hoc values acceptance, accountability, and humility. We aren’t heroes. We learn from our mistakes and improve the process for the next time. We build small, inclusive teams to collaborate closely with our partners to solve the right problems and deliver software that works.

The Federal Civilian business unit supports many customers spanning the federal, commercial, and nonprofit space. Our customers include NASA, the General Services Administration, Office of Personnel Management, the Library of Congress, Health & Human Services, and the FDIC. We partner with these agencies to build new capabilities, deliver products, establish data as a strategic asset for informed decision-making, modernize legacy systems, and build the digital service infrastructure necessary to scale their mission impact.

Primary Responsibilities:

Experience with Palo Alto, panorama OS (PAN-OS), Firewalls, SIEM, Security Configuration Management (SCM), migration, security and compliance, RBAC and access models, Data Loss Prevention (DLP), Strata Cloud Manager

Operate and engineer enterprise web proxy, deliver reliable policy changes, and diagnose issues down to packet level

• Configuring Network ACLs, firewalls, and security groups to enforce policy and isolate sensitive workloads.
• Design secure network infrastructure enforcing Zero Trust principles for the DXP.
• Ensure 100% compliance with IRS/NIST boundary protection standards.
• Proxy Engineering
  • Forward/reverse proxy modes; explicit vs transparent; PAC/WPAD design and distribution.
  • SSL/TLS inspection: cert chains, pinning impacts, ALPN, HTTP/2 behavior, auth flows (Kerberos/NTLM, SAML/OIDC).
  • Safe bypass strategies (domain/SNI/IP/risk-based) without degrading coverage.
• Layer 3 & Internet Fundamentals
  • Routing & addressing (CIDR, MTU/fragmentation/PMTUD, NAT44/66, VRFs), basic BGP/OSPF, DNS recursion/forwarding and failure modes.
• Ports & Protocols
  • TCP/UDP behavior, ephemeral ranges, TLS handshake/SNI, and middlebox interactions (no QUIC/HTTP-3 requirement).
• PCRE
  • Writes and reviews complex PCRE (lookarounds, backreferences, atomic groups) with an eye for performance (avoid catastrophic backtracking).
• Troubleshooting: Packets + Analytics
  • tcpdump/Wireshark proficiency (TLS/HTTP analysis, TCP dynamics).
  • Log correlation at scale (e.g., Splunk/ELK) to isolate issues off-box (client, network, IdP, upstream).
  • Can distinguish origin responses vs proxy-generated errors and document root cause.
• Communication & Prioritization
  • Clear stakeholder comms; triage correctly under load—doesn’t treat every noisy issue as P1.

Goals:

• Normalize firewall / Panorama versions
• Get Panorama 12.x integrated with Strata Cloud Manager as the “real” central manager
• Upgrade the DLP plug-in so it works cleanly in SCM

Preferred Qualifications:

• Current or previous Federal Government Clearance

To learn more about working at Ad Hoc, please visit:https://adhocteam.us/join

Benefits:

• Company-subsidized health, dental, and vision insurance
• Flexible PTO
• 401K with employer match
• Paid parental leave after one year of service
• Employee Assistance Program

Ad Hoc LLC is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, national origin, ancestry, sex, sexual orientation, gender identity or expression, religion, age, pregnancy, disability, work-related injury, covered veteran status, political ideology, marital status, or any other factor that the law protects from employment discrimination.

We value the unique skills gained through military service and encourage veterans and transitioning service members to apply.

In support of various state and city equal pay transparency laws, Ad Hoc job descriptions feature the starting range we reasonably expect to pay to candidates who would join our team with little to no need for training on the responsibilities we've outlined above. Actual compensation is influenced by a wide range of factors including but not limited to skill set, level of experience, and responsibility. The range of starting pay for this role is $153,000-187,000. Our recruiters will be happy to answer any questions you may have, and we look forward to learning more about your salary requirements.

job reference:

https://adhoc.team/