Network Migration Engineer (Cloud, Hybrid Connectivity & Legacy Modernisation)

About Us :

Location: Remote (UK-based) On-site work required only during key migration or cutover activities

Type: Contract or Permanent

Clearance: (Add if required)

Travel: Occasional UK travel for migration weekends, physical DC work or high-risk cutover events

Role Summary :

We are seeking experienced Network Migration Engineers to design, build and execute the network transformations required for large-scale legacy-to-cloud migrations.

You will support migrations from traditional data centre environments into AWS and Stromasys emulation platforms (CHARON), ensuring robust and secure hybrid connectivity throughout the process.

This role is remote-first but requires hands-on support during cutovers, weekend migrations and controlled outage windows.

Key Responsibilities :

Network Design & Migration Execution

• Design and implement AWS network landing zones, including VPC layouts, subnetting, routing, segmentation and network security controls.
• Build hybrid connectivity between on-premises data centres and AWS, covering:
• Site-to-Site VPN
• AWS Direct Connect
• SD-WAN integrations
• Routing and redistribution between environments
• Support live production transitions, including route changes, failover, NAT adjustments, and traffic migration.

Cutover & Change Delivery

• Participate in migration weekends, overnight cutovers and high-risk change windows.
• Execute network changes in accordance with formal runbooks and change-control processes.
• Own and maintain runbooks covering:
• Prerequisite checks
• Implementation steps
• Rollback plans
• Validation/testing procedures
• Troubleshoot real-time issues across routing, firewalling, connectivity and cloud network layers.

Collaboration Across Teams

• Work closely with cloud engineers, architects, security analysts and platform teams to define end-to-end migration patterns.
• Interface with application teams to support dependencies, firewall rules, DNS changes and service routing outcomes.

Stromasys Emulation Networking

• Understand or learn the networking behaviour of Stromasys CHARON emulated systems (SPARC/Power).
• Assist in mapping legacy network topologies into their emulated/cloud equivalents.
• Ensure traffic flow, latency, firewall rules and segmentation meet legacy application requirements.

Experience Required :

Core Network Engineering

• Strong hands-on networking experience with enterprise vendors such as:
• Cisco (IOS/XE/NX-OS)
• Juniper (Junos)
• Palo Alto Networks
• F5 / Citrix ADC (desirable)
• Deep understanding of routing (BGP, OSPF, static), switching, segmentation, VLANs, VRFs and ACLs.

Cloud & Hybrid Networking

• Proven experience designing and implementing AWS networking, including:
• VPCs, subnets, route tables
• Transit Gateway
• IGWs, NGWs, VPC endpoints
• Security groups and NACLs
• Strong experience delivering hybrid connectivity (VPN, Direct Connect, routing integration).

Migration & Cutover Delivery

• Experience performing network changes as part of large-scale cloud migrations.
• Comfortable working during weekend cutovers, outage windows and high-pressure transitions.
• Proven ability to follow and create detailed network migration runbooks.

Desirable :

• Understanding of Stromasys CHARON network requirements and patterns.
• Experience supporting legacy operating system migrations (AIX, Solaris, HP-UX etc.).
• Familiarity with multi-cloud or cross-cloud routing.

Soft Skills & Delivery Attributes :

• Strong communication across cross-functional engineering, operations and architecture teams.
• Ability to operate calmly and accurately during high-risk change events.
• Excellent documentation skills.
• Analytical and methodical problem solver with strong attention to detail.

Salary Banding

£450–£550 per day / £65,000–£80,000 perm FTC

Interview Question Bank

• Explain how you design hybrid networking for AWS migrations.
• What is your approach to planning network cutovers?
• Describe how you've handled routing or segmentation challenges.