Hub-and-spoke across three regions

The company

TeleTracking builds software for hospitals — patient flow and capacity management. Healthcare software carries a constraint most platforms do not: the migration cannot be visible to the people using it.

The problem

They were carrying three constraints at once on Azure: ongoing cost, infrastructure management that consumed significant staff time, and a footprint that could not scale with the business.

They had been planning a move for more than three years without one happening.

What I did

The engagement ran as an AWS Migration Acceleration Program (MAP) Assess. I ran discovery workshops to map the Azure footprint against the actual business drivers, then produced a total cost of ownership analysis covering licensing, hardware and operational expense — the artefact that turns “we should move” into a decision someone can sign.

Then I designed the target: a hub-and-spoke network topology spanning three regions, two in the US and one in Europe.

• Transit Gateway as the hub, centralising ingress and egress rather than letting each spoke manage its own path out
• WAF and load balancers at the edge, in a dedicated edge VPC where the firewall subnets run AWS Network Firewall endpoints alongside the Transit Gateway attachments, with flow logs on
• AWS Directory Service and RDS for MSSQL with a replica in the workload VPC, because the target had to interoperate with what the customer already ran on Azure rather than replace it wholesale
• Multi-region from the start, because retrofitting region isolation into a running healthcare platform is considerably harder than designing for it

Result

The architectural assessment was completed within a month, against a client history of three-plus years of planning. The migration and optimisation delivered substantial savings — the engagement did not publish a figure, and I am not going to invent one.

Centralising ingress and egress is what made the rest tractable: it gave them one place to apply policy across three regions instead of three places to keep in sync.