Senior Juniper Network Architect in London, Greater London

Sr. Juniper Network Architect

Our global communications client is looking for a hands-on Senior Architect/Engineer for a highly technical, customer-facing role providing post‑sales, on‑site technical support for Juniper Networks products/solutions. This role partners closely with our client's Network Engineering, Architecture, and Operations teams to ensure high availability, scalability, and operational excellence across large‑scale service provider networks.

The role requires you to have a deep technical expertise in the Juniper products deployed (and planned for deployment) within our client's network and delivers reactive and proactive operational support, design guidance, and best‑practice recommendations.

Essential Skills

• Senior Juniper architect spanning campus, data center, routing and security; able to own customer design and consulting.
• Experience in supporting major network transformations, upgrades, or expansions.
• 10+ years large-IP network design, implementation and operation.
• Large‑scale hands‑on experience with: MX, QFX, EX, ACX and PTX platforms
• BGP/OSPF, IS-IS, RSVP-TE/LDP; EVPN/MPLS, VPWS/VPLS and L2/L3VPN.
• Juniper EVPN/VXLAN campus and DC fabrics.
• Strong experience with JUNOS CLI.
• SRX high-end/midrange/branch security; firewall policy, IPS, IPsec and high availability; Mist.
• Expert-level Technical Certifications: JNCIS, JNCIP, JNCIE, CCNP, and CCIE a strong
• Automation experience
• JNCIE highly preferred

The right candidate should also have a strong understanding of service provider networking technologies, including:

• TCP/IP & MPLS fundamentals
• Routing protocols: OSPF, IS‑IS, BGP
• MPLS‑TE, RSVP, LDP
• IPv4/IPv6
• BGP routing policy & peering
• VPN technologies: L3VPN, VPLS, MVPN
• Ethernet switching, 802.1Q
• QoS / Class of Service
• Hands‑on Scripting Python & Juniper PyEZ.

Role Responsibilities:

• Provide day‑to‑day post‑sales operational support for production and pre‑production network environments
• Troubleshoot complex hardware, software, and network issues across large‑scale IP/MPLS infrastructures
• Open, manage, and drive Juniper JTAC cases to resolution, including root cause analysis and corrective actions
• Support during critical incidents, outages, and escalation scenarios
• Conduct network information‑gathering workshops to understand current network architecture, operational workflows, and future design
• Provide guidance on network design evolution, capacity growth, and technology adoption aligned with the roadmap.
• Assist with major network upgrades, maintenance windows, migrations, and change events
• Lead technology and operations workshops to review ongoing issues and JTAC case status and explain root causes, mitigations, and long‑term solutions
• Train engineering, implementation, and operations teams on configuration, monitoring and day‑to‑day operation of Juniper platforms
• Assess network health and stability across Juniper environments.
• Create and review customer SOPs and MOPs to identify procedural gaps that could result in network or service outages
• Develop and maintain automation scripts to reduce operational toil, improve consistency and accuracy, & accelerate troubleshooting
• Write & support Python‑based automation tools for configuration

This is an excellent senior technical role that offers a great opportunity to work for a global communications client. The role can be worked hybrid based out of London & falls outside of IR35.

I have interview slots ready to be filled so if you have the required depth and seniority with Juniper Networking then don't delay and apply ASAP.

Randstad Technologies is acting as an Employment Business in relation to this vacancy.