Job#: 3018585 Job Description: Senior Network Engineer - Juniper Mist Campus MigrationsRemote but must be willing to travelRole OverviewThe Senior Network Engineer is responsible for leading large-scale campus modernization programs, transforming complex legacy Cisco environments into simplified, scalable, cloud-managed architectures powered by Juniper Mist. This role requires deep expertise in routing, multicast, mixed-vendor interoperability, and end-to-end migration execution across multi-site enterprise networks. The engineer will design, plan, and deliver campus migrations leveraging Juniper EX/QFX fabrics, Mist Wired Assurance, and Marvis AI while ensuring service continuity, operational stability, and measurable improvements in visibility and performance.
Key ResponsibilitiesCampus Modernization & Migration Delivery- Lead multi-site migrations from legacy Cisco core/distribution/access designs (EIGRP, STP, HSRP/VRRP, Catalyst access) to Juniper EX/QFX collapsed-core architectures.
- Build and deploy Mist Wired Assurance frameworks, including templates, site profiles, port profiles, and standardized configuration patterns.
- Execute phased cutovers with parallel-run strategies, validation checkpoints, and well-defined rollback plans to minimize downtime and preserve business-critical services.
- Conduct discovery, dependency mapping, and redesign of routing, segmentation, VLAN/VRF structures, and IP addressing schemes.
Routing Architecture & Interoperability- Design and implement enterprise routing using BGP, OSPF, and EIGRP, including redistribution strategy, route tagging, summarization, and policy controls.
- Engineer stable Cisco ? Juniper mixed-vendor cores using eBGP/iBGP, OSPF adjacencies, deterministic redistribution, and policy-driven traffic engineering.
- Ensure routing stability during transition periods, preventing loops, leaks, and unexpected path changes.
Multicast Engineering- Architect and troubleshoot enterprise multicast across campus cores and distribution layers.
- Implement PIM-SM/SSM, IGMP v2/v3, snooping/querier functions, and RP strategies (static or Anycast-RP).
- Maintain multicast continuity for voice/video, conferencing, IPTV/digital signage, OT/industrial systems, and discovery-based applications during migrations.
Legacy Cisco Assessment & Translation to Junos- Analyze existing Cisco environments (STP domains, EtherChannel, HSRP/VRRP, ACL/QoS, multicast dependencies, WAN handoffs).
- Translate Cisco constructs into Junos equivalents (ACLs vs prefix-lists, route-maps vs policy-options, VRF-Lite, ECMP, MTU/QoS alignment).
- Ensure clean interop between legacy and modernized cores throughout the migration lifecycle.
Operationalization & Documentation- Produce HLDs, LLDs, as-built documentation, runbooks, and operational guides.
- Support post-cutover stabilization, knowledge transfer, and training for operations teams.
- Define and track KPIs/SLEs to measure migration success and ongoing network health.
Required Skills & ExperienceCore Technical Expertise- Cisco ? Juniper interoperability: mixed-vendor routing design, BGP/OSPF adjacency strategy, redistribution boundaries, route filtering, tagging/communities.
- Routing (expert level):
- BGP: iBGP/eBGP, policy control, communities, summarization, convergence tuning.
- OSPF: area design, ABR/ASBR roles, LSA control, authentication.
- EIGRP: migration patterns, stub design, filtering, summarization.
- Multicast: PIM-SM/SSM, IGMP v2/v3, snooping/querier, RP/Anycast-RP, boundary controls, end-to-end flow troubleshooting.
- Migration execution: parallel-run, phased cutovers, validation criteria, rollback plans, change control.
- Segmentation & addressing: VLAN/VRF mapping, IP renumbering, DHCP/DNS dependencies, voice/video/OT considerations.
- Mist platform delivery: Wired/Wireless Assurance onboarding, switch/AP turn-up, templates/variables, SLE-driven acceptance.
- Operational readiness: documentation, runbooks, training, stabilization plans, KPI/SLE tracking.
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click for more details.
Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.
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