Senior Network Engineer (IPv6 Design and Migration)

Quadtec Solutions, Inc.; Herndon (VA); On-site; USD 120,000 - 180,000; Full time

Job summary

Quadtec Solutions, Inc. is seeking a Senior Network Engineer with deep IPv6 expertise to lead IPv6 assessment, design, and testing across the corporate network.

You will drive dual-stack implementations, multicast routing, and Cisco-based design efforts to ensure a secure transition to next-generation IP networking. The role requires hands-on experience with IPv6 addressing and migration strategies, and a strong background in OSPFv2/v3 and BGP for IPv6.

Qualifications

• 7+ years of progressive network engineering experience in enterprise or service provider environments.
• Hands-on IPv6 addressing, routing, and migration strategies.
• Experience with IPv4/IPv6 dual-stack networks.
• Cisco routing and switching platforms; CCNP or higher certification preferred.
• Proficiency in routing protocols OSPFv2/v3 and BGP with IPv6.
• Ability to produce design documents, test plans, and assessment reports.
• Familiarity with security policies in dual-stack networks (ACLs).
• Understanding of federal or regulatory IPv6 mandates (OMB M-21-07).

Responsibilities

• Assess existing network for IPv6 readiness across routers, switches, firewalls, and hosts.
• Develop a prioritized IPv6 integration roadmap from IPv4 gaps.
• Audit hardware/software compatibility for IPv6, including IOS/IOS-XE.
• Document current topology and present findings to stakeholders.
• Architect IPv4/IPv6 dual-stack solutions with forward compatibility.
• Design scalable IPv6 addressing plans and multicast routing.
• Create HLD/LLD with topology diagrams and routing policies.
• Collaborate with security, systems, and apps teams for IPv6 compatibility.
• Develop and execute IPv6 test plans (dual-stack, tunneling, NAT64/DNS64).
• Perform PoC testing before production deployment.
• Validate multicast functionality and QoS in IPv6 contexts.
• Troubleshoot dual-stack issues and perform root-cause analysis.
• Develop migration procedures with change management and rollback.
• Serve as SME for IPv6 and multicast; mentor junior engineers.
• Participate in CAB reviews and advise on network changes.

Skills

IPv6 expertise

Dual-stack design

Multicast routing

OSPFv2/v3 & BGP IPv6

Cisco platforms

Network automation (Python/Ansible)

ACLs security policies

Mentoring/SME

Education

Bachelor's degree in CS/IT/Network Engineering

Tools

Python

Ansible

Cisco IOS/IOS-XE

Job description

US Citizenship required to obtain government clearance.

Position Overview

We are seeking a highly skilled Senior Network Engineer with deep expertise in IPv6 technologies to join our team. This role is critical to driving our projects IPv6 Assessment, Design, and Testing initiatives across the network. The ideal candidate will bring hands-on experience with dual-stack environments, multicast routing, and Cisco platforms, ensuring a seamless and secure transition to next-generation IP networking.

Key Responsibilities

• Conduct comprehensive assessments of the existing network infrastructure to evaluate IPv6 readiness across routers, switches, firewalls, and end-host systems.
• Identify gaps in current IPv4 configurations and develop a prioritized roadmap for IPv6 integration.
• Perform audits of hardware and software compatibility for IPv6 support, including IOS/IOS-XE feature validation.
• Document current-state network topology and provide detailed findings and recommendations to stakeholders.
• Architect IPv4/IPv6 dual-stack solutions that ensure backward compatibility while enabling full IPv6 functionality.
• Design scalable IPv6 addressing plans
• Develop multicast routing designs for IPv6 environments.
• Create high-level and low-level design documents (HLD/LLD), including topology diagrams, IP allocation schemes, and routing policy specifications.
• Collaborate with security, systems, and application teams to ensure end-to-end IPv6 compatibility.
• Develop and execute comprehensive test plans for IPv6 deployment scenarios, including dual-stack, tunneling (6in4, GRE, ISATAP), and translation (NAT64/DNS64) mechanisms.
• Perform lab-based proof-of-concept (PoC) testing prior to production deployment.
• Validate multicast functionality, routing protocol behavior and QoS policies in an IPv6 context.
• Troubleshoot complex network issues across dual-stack environments and provide root-cause analysis.
• Develop production migration procedures, including change management documentation and rollback procedures.
• Serve as a subject matter expert (SME) for IPv6 and multicast technologies within the project.
• Mentor junior engineers and provide knowledge transfer on IPv6 best practices.
• Participate in change advisory board (CAB) reviews and provide technical input on network changes.

Experience

7+ years of progressive network engineering experience in enterprise or service provider environments

IPv6

Demonstrated hands-on experience with IPv6 addressing, routing, and migration strategies

Dual Stack

Proven experience designing and operating IPv4/IPv6 dual-stack networks

Strong knowledge of multicast routing protocols (PIM-SM, IGMP, MLD) in both IPv4 and IPv6

Certification

Cisco CCNP (Enterprise or Service Provider) and/or equivalent industry experience

Routing Protocols

Proficiency with OSPFv2/v3, BGP (including IPv6 address families)

Platforms

Hands-on experience with Cisco routing and switching platforms

Documentation

Ability to produce clear, professional network design documents, test plans, and assessment reports

Preferred Qualifications

• Cisco CCIE (Enterprise Infrastructure or Service Provider) certification
• Experience with network automation tools (Python or Ansible) for IPv6 deployment at scale
• Familiarity with SNMP, NetFlow, and monitoring tools in IPv6 environments
• Experience with security policies in dual-stack networks (ACLs)
• Prior experience leading or participating in large-scale IPv6 migration projects
• Understanding of federal or regulatory compliance frameworks related to IPv6 mandates (e.g., OMB M-21-07)

Education

Bachelor's degree in Computer Science, Information Technology, Network Engineering, or a related field - or equivalent combination of education and experience.

Due to the sensitivity of the work, on-site attendance is mandatory five days a week.

Quadtec is an equal opportunity employer.