Architecture Documentation (HLD/LLD)

Produce clear High‑Level and Low‑Level Design documentation (HLD/LLD) - covering decisions, diagrams, security, and operating considerations so delivery is aligned and defensible.

When architecture is not documented, delivery teams make assumptions in isolation: solutions drift, security decisions are inconsistent, and stakeholders only discover gaps late in the project - when remediation is expensive. High‑Level Design (HLD) aligns stakeholders on the target architecture and the ‘why’ behind key decisions. Low‑Level Design (LLD) translates those decisions into implementable detail: configuration approach, integrations, dependencies, and operational controls. For Microsoft 365, Azure, and security platforms, strong design documentation is often the difference between a predictable deployment and a programme defined by rework and escalations.

LW IT Solutions delivers Architecture Documentation (HLD/LLD) as a structured service to create implementation-ready design packs. We capture requirements and constraints, document current and target states, define architecture patterns (identity, networking, data flows, and security controls as applicable), and record key design decisions and assumptions. You receive a clear HLD/LLD set that supports build, assurance, and handover - plus a roadmap for implementation and validation so delivery teams can execute with confidence.

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Service Overview

Highlights

Clear separation between high-level intent and low-level implementation detail
Architecture diagrams covering logical structure and key flows
Explicit documentation of assumptions, risks, and trade-offs
Security and identity considerations captured within the design scope
Documents structured for review, approval, and delivery handover

Business Benefits

Reduce delivery risk by aligning teams on architecture decisions before build begins
Limit rework and late-stage changes through clear documentation of constraints and assumptions
Make security, identity, and compliance decisions visible and reviewable
Improve handover to delivery, operations, and support teams
Provide defensible design artefacts for governance, assurance, and audit

Typical use cases

Programmes preparing for Microsoft 365 or Azure platform deployments
Projects requiring design artefacts for internal governance or external assurance
Organisations handing delivery to partners or internal build teams
Security or compliance-driven initiatives needing documented design decisions
Complex changes where support and operational impact must be understood upfront

Objectives & deliverables

What Success Looks Like

Align stakeholders on architecture decisions before implementation begins
Reduce rework by documenting assumptions, constraints, and non‑functional requirements
Strengthen security posture by making security and identity decisions explicit and reviewable
Improve supportability through documented operating considerations and dependencies
Provide an artefact suitable for governance, assurance, and partner delivery

What You Get

High‑Level Design (HLD) document: target architecture, principles, and key decisions
Low‑Level Design (LLD) document: implementable configuration and integration detail (within scope)
Architecture diagrams: logical views and key data/identity/network flows as applicable
Decision log/assumptions register suitable for governance and assurance
Implementation roadmap: sequencing guidance, dependencies, and validation approach

How It Works

Discovery - gather requirements, constraints, non-functional needs, and current state information
Architecture definition - document target architecture, patterns, and key design decisions
HLD production - create high-level diagrams and narrative covering structure and rationale
LLD production - define implementable configuration, integrations, dependencies, and controls
Review and validation - walk through designs with stakeholders and capture sign-off
Handover - deliver final documents with an implementation roadmap and decision log

Engagement Options

HLD Only - high-level architecture and decision documentation for early alignment
HLD and LLD - full design pack suitable for implementation and assurance
LLD Deep Dive - detailed low-level design for a defined platform or workload
Assurance Support - design review updates to address governance or audit feedback

Common Bundles

Customers who use this service often bundle with these services

Delivery Assurance & Technical Governance
Independent delivery assurance provides architecture reviews, quality gates, and readiness checks that reduce rework, risk, and late stage surprises.

Zero Trust Architecture & Hardening
Design and implement a Microsoft aligned Zero Trust programme covering identity, devices, least privilege access, segmentation, and continuous monitoring.

Microsoft Entra ID Architecture & Health Check
Assess Microsoft Entra ID architecture and tenant health to identify risk areas, configuration drift and prioritised identity improvements.

Azure Landing Zones (CAF-aligned)
Build a secure, scalable Azure foundation using CAF-aligned landing zones with clear governance, identity, networking, and management baselines.

Azure Network Architecture (Hub/Spoke, DNS, Private Link)
Azure network architecture services covering hub and spoke design, DNS, routing and Private Link to support secure, scalable connectivity.

Documentation Packs & Runbooks
Create professional documentation packs and runbooks that make deployments, migrations and daily operations supportable, auditable and consistent teams.