Senior Network Architect

Transaction Network Services (TNS); Greater London; On-site; GBP 104,696 - 134,609; Full time

Benefits offered by this job

Medical benefits

Dental insurance

Life insurance

401(k) plan with company match

Job summary

A global managed service provider is seeking a Senior Network Architect to design, document, and deploy services within a complex IP/MPLS network. The role involves creating large-scale solutions, driving automation efforts, and providing third-level support. Ideal candidates will have deep experience in MPLS or SD-WAN environments, strong troubleshooting skills, and a collaborative spirit to work within a dynamic team. This position offers competitive compensation and a range of benefits.

Qualifications

• Extensive TCP/IP and routing knowledge (BGP, OSPF, etc.).
• Clear written and verbal communication skills.
• Self-motivated with minimal instruction.

Responsibilities

• Design, test and document new technologies and solutions.
• Collaborate with Pre-Sales Engineers to translate customer requirements.
• Evaluate platforms and solutions with vendors for product inclusion.

Skills

Architecture and provisioning of MPLS or SD-WAN environments

Hands-on design and configuration of Fortinet FortiGate devices

Network automation and orchestration using Terraform, Ansible

IPSec design, configuration, operation and troubleshooting

Designing cloud-based architectures in AWS, Azure, or GCP

Extensive TCP/IP and routing knowledge

Expert troubleshooting and debugging skills

Flexibility for on-call support as required

Tools

Terraform

Ansible

Fortinet devices

Cisco DNA Center

Job description

Join to apply for the Senior Network Architect role at Transaction Network Services (TNS).

Overview

As a senior member of the Network Architecture team, you design, document and deploy services within a global Managed Service Provider IP/MPLS network. You create large‑scale SD‑WAN, IPSec and MPLS VPN, IP multicast solutions, and integrate services into private‑ and public‑cloud environments. You also drive automation, orchestration and the transition to a NetDevOps model while owning projects from requirements gathering to delivery.

Responsibilities

• Design, test and document new technologies, features, and solutions for repeatability and support by the Implementations team and Network Operations Center.
• Collaborate with Pre‑Sales Engineers and Product Marketing to translate customer requirements into scalable, consistent, and supportable technical solutions.
• Evaluate platforms and solutions with existing and new vendors for inclusion in TNS’s product suite.
• Provide third‑level support to the Network Operations Center staff and Implementations teams.
• Develop and maintain detailed lab test plans, reports, procedures, and configuration documentation; provide training to operations and engineering teams.
• Interact with vendors to resolve problems, bugs, and troubleshoot configuration issues.

Essential Skills

• Architecture and provisioning of MPLS or SD‑WAN environments.
• Hands‑on design and configuration of Fortinet FortiGate devices within SD‑WAN topologies.
• Network automation and orchestration using tools such as Terraform, Ansible, JSON, Nautobot, Arista Cloudvision, Cisco DNA Center.
• IPSec (including DMVPN and RRI) design, configuration, operation and troubleshooting.
• Designing cloud‑based architectures in AWS, Azure, or GCP.
• IP Multicast design, configuration, operation and troubleshooting.
• Network design based on high‑level customer requirements.
• Extensive TCP/IP and routing knowledge (BGP, OSPF, ISIS, EIGRP, PIM, BFD).
• Customer Edge features such as NAT, VRRP/HSRP.
• Comprehensive documentation creation and maintenance.
• Expert troubleshooting and debugging skills.
• Vendor product evaluation (hardware, software, service provider).
• Broadband service deployments (xDSL, Cable).
• Planning and coordinating network maintenance and installation windows.
• Hardworking, focused, thorough, and punctual.
• Clear written and verbal presentation skills to peers and management.
• Support for Tier‑1 and Tier‑2 environments.
• Self‑motivated with minimal instruction; collaborative.
• Flexibility for on‑call support as required.

Desirable Skills

• Fortinet, Cisco, and/or Juniper certifications (NSE levels 4–7, CCIE/CCNP‑SP, JNCIE, JNCIP).
• AAA, Tacacs+, Radius, CA/PKI.
• Voice over IP, Dial Services, wireless services, F5 load‑balancing.
• Data center design (Cisco Nexus, Arista, Juniper).
• Server load‑balancing on F5, Netscaler, AWS ALB/SLB.
• GIT, Jenkins, and other DevOps tools, Agile practices.
• CloudFormation template creation and deployment.
• Automation with Python, Ansible, vendor‑specific tools.
• Firewall configuration (PIX/ASA, IOS, JunOS).
• AWS/GCP/Azure architecture automation.
• NSX‑V/NSX‑T networking automation.
• OpenStack networking automation.
• UNIX/Linux experience.

Compensation & Benefits

For this U.S. role, compensation is $140,000–$180,000 annually, with variable pay and bonuses. Benefits include medical, dental, life insurance, paid holidays, vacation, and a 401(k) plan with company match.

TNS is an equal opportunity employer. TNS evaluates qualified applicants without regard to race, color, religion, gender, national origin, age, sexual orientation, gender identity or expression, protected veteran status, disability/handicap status or any other legally protected characteristic.