Infrastructure Architecture
On-premises and hybrid infrastructure design spanning Active Directory, Exchange Server, Windows Server, virtualisation, PKI, and segmentation.
Key Outcomes
- Clarify the target-state platform
- Remove gaps in resilience and control
- Document the stack for delivery and handover
Deliverables
- Infrastructure assessment + gap analysis
- Active Directory design
- Exchange Server deployment
- Windows Server roles (ADDS, DNS, PKI)
- VMware / Hyper-V design
- Network segmentation + firewall rules
- HLD/LLD + runbooks
Executive Context
Hybrid infrastructure decisions shape the reliability, security, and cost profile of every Microsoft workload sitting above them. Estates that evolve through project-by-project change often end up with unclear management boundaries, inconsistent identity dependencies, and platform components that no longer reflect current business risk.
This service matters when leadership needs the infrastructure estate to support modernization without losing control of resilience, supportability, or governance. It focuses on target-state design rather than isolated technical fixes.
Architecture Overview
The architecture review covers the interaction between on-premises infrastructure, Azure landing zones, network boundaries, identity services, management tooling, backup, and operational governance. The objective is to define a platform direction that supports Microsoft 365, business applications, and future migration choices without hidden dependency traps.
Recommendations are grounded in business criticality, operational maturity, and the level of cloud adoption that the client can realistically absorb. That keeps the output useful as an executive and delivery document, not just a technical wish list.
Key Design Decisions
- Which workloads should remain on-premises, move to Azure, or be redesigned based on supportability, latency, compliance, and commercial priorities.
- How management, monitoring, identity, and backup services will be segmented so the platform does not depend on brittle cross-service assumptions.
- Which resilience patterns are appropriate for critical services, including recovery expectations, failover strategy, and operational testing cadence.
- How governance standards will be applied across platform ownership, change control, naming, and documentation so the estate remains operable over time.
Common Risks / Pitfalls
- Moving workloads to Azure without redesigning identity, network, or operational dependencies, which recreates legacy issues in a new location.
- Allowing platform standards to vary by project or supplier, leaving the estate inconsistent and difficult to support during incidents.
- Underestimating recovery design by focusing on backups alone instead of recoverability, service dependencies, and operational testing.
- Treating architecture documentation as a final deliverable rather than as a decision record that should actively guide future change.
Engagement Approach
Current State Assessment
Review platform topology, operational ownership, hosting patterns, business-critical services, and existing documentation quality.
Identify where the estate contains hidden dependencies, unsupported assumptions, or modernization blockers.
Target-State Design
Define the desired platform architecture, control boundaries, transition priorities, and decision points that matter most to business and technical stakeholders.
Translate the target state into design principles and implementation sequencing rather than leaving it as a conceptual diagram only.
Roadmap And Handover
Produce architecture outputs that can support CAB, investment discussions, and downstream implementation teams.
Hand over a prioritized roadmap so the client can modernize in phases while preserving service stability.
Outcomes / Business Value
- A clearer hybrid infrastructure direction that aligns business priorities, operational realities, and Azure adoption goals.
- Reduced architectural debt through better-defined platform boundaries, standards, and ownership models.
- Decision-ready documentation that helps internal teams and suppliers implement change with fewer surprises.
Strong infrastructure architecture is less about diagrams and more about making future change safer. This engagement gives the client a target-state platform design that can support real delivery decisions.
Exchange 2019 Migration & Hybrid with Exchange Online
- Exchange 2019 deployed and fully operational
- Hybrid configuration with Exchange Online live
- Forest and domain functional level upgraded to 2019
An organisation that still depends on on-premises infrastructure and needs a documented, resilient target-state design before a cloud migration or a major hardware refresh cycle.
Review current state and define sprint scope
Controlled implementation with daily async updates
Architecture docs, runbook, and rollback pack
Frequently Asked Questions
What does an infrastructure architecture engagement deliver?
A documented target-state design covering Active Directory topology, Exchange Server deployment, network segmentation, PKI design, and virtualisation platform — including a phased implementation roadmap.
Does this cover cloud migration planning?
Yes. The output includes a phased roadmap that sequences the on-premises foundation work before cloud workload migration, so cloud adoption is built on a stable base.
How long does an infrastructure architecture engagement take?
Two to four weeks for the discovery and design phase. Implementation support is scoped separately based on target-state complexity.
Do you work remotely?
Yes — discovery, design, and documentation are all delivered remotely via Microsoft Teams.
What technologies are covered?
Active Directory, Exchange Server, Windows Server 2019/2022, PKI and Certificate Services, and virtualisation platforms including VMware vSphere and Microsoft Hyper-V.