AWS Landing Zones, Architecture & Migration
We design AWS Well-Architected landing zones and migrate existing accounts and services into them without downtime - turning ad-hoc, sprawling AWS estates into a secure, governed foundation you can actually build on.
The Problem With Most AWS Estates
Very few AWS accounts are designed. Most grow: a new account here for a project, another for a client, permissions granted individually as people ask for them, logging and monitoring bolted on inconsistently per account if at all. It works, until it doesn't - and by the time anyone notices, nobody is fully confident what would happen if one account was compromised, or what the blast radius of a mistake actually is. The usual response is to leave it alone, since a proper re-architecture sounds like weeks of downtime and risk for something that "isn't broken." That's the part we specialise in changing.
What This Looks Like in Practice
A Real Landing Zone Migration
We recently designed and built an AWS Well-Architected landing zone for a client whose AWS estate had grown organically over several years into a sprawling set of accounts with inconsistent guardrails and no centralised visibility. We then migrated every one of their existing accounts and production services into the new landing zone - with zero downtime. No maintenance windows, no service interruption, nothing their customers noticed.
- Full multi-account estate migrated, not just new workloads
- Zero downtime across the entire migration
- Centralised logging, guardrails, and access control from day one
- Built and documented as code, not clicked together
How We Approach a Landing Zone Migration
Zero downtime isn't luck - it's the result of not moving anything until you understand exactly what depends on it.
Assess & Map
Audit the existing accounts, workloads, and the dependencies between them, so the migration order is based on what the estate actually needs, not assumptions.
Design the Landing Zone
AWS Organizations structure, service control policies, centralised logging and threat detection, federated identity, and network foundations - designed against the AWS Well-Architected Framework and built as code from the outset.
Plan the Migration Path
Sequence the migration by dependency and risk, define a rollback point for every stage, and validate each move in isolation before it ever touches production traffic.
Execute Without Downtime
Phased cutover using whatever technique suits the workload - parallel running, weighted routing, blue/green - so nothing goes dark mid-migration.
Validate & Hand Over
Confirm the new landing zone actually holds up under real traffic, then hand over documentation and runbooks - not just a working system nobody but us understands.
A governed, secure AWS estate, migrated without anyone noticing
What's Included
Multi-Account Structure
AWS Organizations, organisational units, and service control policies designed around how your teams actually work.
Centralised Visibility
Consolidated CloudTrail, GuardDuty, and logging, so you can see across the whole estate from one place instead of piecing it together per account.
Federated Access
IAM Identity Center and role-based access, so permissions are granted through a structure rather than accumulated one request at a time.
Infrastructure as Code
The landing zone itself is built in Terraform from day one, so it's reproducible, reviewable, and not dependent on anyone's memory of what was clicked where.
Credentials
Relevant wherever a landing zone's secrets management needs to be built properly rather than bolted on.
Vault Associate
Vault Operations Professional
Has Your AWS Estate Grown Faster Than Its Governance?
If migrating feels riskier than leaving things as they are, that's usually a sign the migration hasn't been planned properly yet. Let's talk about what a landing zone migration would actually look like for your estate.