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Consulting Solution Architect, Key Account - United Kingdom

Calix

Calix

IT
London, UK
Posted on Dec 18, 2025
Lead advanced solution architecture activities with Calix key customers in the United Kingdom and elsewhere.

Job Description
We are looking for dynamic, curious, motivated, and self-starting Sales Engineer/Solution Architect to join our team in the UK. This position is responsible for technical engagement with the customer architects at CTO level. You will be responsible for understanding a customer’s existing environment, designing target architectures, and hands-on implementation of designs.

The candidate must be independent, proactive and comfortable working in small teams with similarly elite personnel. In this role, you will build strong trusted relationships, interact with, and influence senior technical staff and CTOs within Calix’s network operator customers. You will have the ability to influence their technology choices and network architecture. The ideal candidate has a strong technical background, experience from a similar position with a proven track record of selling advanced network solutions to network operators at the highest level.

Experience Requirements

  • At least 10 years of network related experience in ISP/Telco environments

  • In-depth knowledge of OSI layer 3 networks and protocols, including broadcast, multicast, anycast concepts, routing, etc.

  • In-depth knowledge with various routing protocols (BGP, OSPF, ISIS, MPLS)

  • In-depth knowledge of OSI layer 2 and practical experience, including various flavors of STP, ARP, QOS, etc.

  • In-depth knowledge of TCP/IP networking, load balancing, firewalls, HTTP, SSL, DNS, DHCP

  • Strong ability to troubleshoot complex issues related to hardware, L3/L2 deployment, application behaviors and TCP stack

  • Solid understanding of network security methodologies, including but not limited to: ACLs,
    Stateful firewalls, VPNs (tunneling, IPsec, PPTP, etc.)

  • Strong knowledge of network management and orchestration platforms

  • Strong knowledge of operational and support (BSS/OSS) systems and understanding interactions with APIs (REST/JSON) including design, integration, and troubleshooting considerations

  • Experience with VLAN Stretching technologies (EVPN, VXLAN)

  • Ability to provide assessment / audit of existing network, infrastructure & services

  • Ability to quickly analyze situations, identify problems, and provide solutions

  • Ability to work independently with minimal oversight and high autonomy

  • Provide leadership and guide customers on technical and operational issues within areas of expertise

  • Strong customer focus, ownership, urgency and drive

  • Strong written and verbal communication skills

Preferred additional Skills/Experience

  • Specialty Certifications are preferred

  • Experience with cloud and SaaS technologies and solutions

  • Experience with SDN

  • Experience with Cisco, Juniper and Nokia routing platforms.

  • Skilled in using Visio and other network documentation