ISAInsight Solution Architecture

Architecture decisions

How difficult choices were framed and made deliverable

These anonymised cases describe representative architecture contributions. They focus on the decision and its evidence—not unsupported claims of business impact or sole authorship.

HR · Identity · Legacy coexistence

Moving the HR source without breaking identity

Introducing a new workforce-data source when a legacy directory remained embedded in identity provisioning and downstream operations.

Decision in brief: Introduce the new workforce source without breaking identity correlation or downstream continuity.

Situation

A new HR platform was being introduced across related enterprises. An established corporate directory was not the HR system of record, but it remained a critical source in the identity chain and could not simply be removed.

Decision required

How should the new HR source feed employee changes while preserving stable identities, existing access and downstream compatibility?

Options and constraints

  • Direct replacement was constrained by the directory’s continuing operational role.
  • Changing established worker identifiers could create duplicate identity profiles.
  • Backdated starters and leavers required explicit exception handling.
  • Data timing, validation, reconciliation and support ownership had to be defined.

Architecture contribution

Architecture contribution included defining the future data path, stable correlation approach, field and ownership boundaries, validation rules, error handling and coexistence controls across HR, directory and identity services.

Architecture result

Established a governed design basis for introducing the new HR source while retaining the directory’s required role and making duplicate prevention, reconciliation and downstream continuity explicit.

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Workforce · Integration · Operations

Connecting HR, time, leave and workforce management

Coordinating workforce information moving in both directions across platforms with different business and operational rules.

Decision in brief: Define bidirectional workforce data movement that remains meaningful, secure and supportable.

Situation

Employee demographics, reported time, schedules, leave requests and leave balances needed to move between an HR platform and a workforce-management environment.

Decision required

What integration model could preserve the meaning and timing of workforce data while remaining secure, observable and supportable?

Options and constraints

  • Each data flow had a distinct source, direction, schedule and change behaviour.
  • Employee and contingent-worker populations required different treatment.
  • Time and leave rules included boundary and mapping conditions.
  • Credential storage, monitoring, incident routing and vendor responsibilities crossed organisational boundaries.

Architecture contribution

Architecture covered integration boundaries, field and classification mappings, timing and delta behaviour, security expectations, monitoring, exception handling, testing, deployment support and operational ownership.

Architecture result

Defined an end-to-end integration and operating model that connected business rules to implementable interfaces, monitoring and support responsibilities.

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Identity · Cutover · Assurance

Changing identity sources safely

Transitioning source priority where uncontrolled aggregation could rapidly propagate duplicate or incorrect identities.

Decision in brief: Change source priority through controlled correlation, verification and explicit go/no-go points.

Situation

An identity-governance environment needed to move toward a new workforce source while existing identity data and connected accounts remained active.

Decision required

How should source priority be changed without allowing duplicate identities, incorrect correlation or uncontrolled access consequences?

Options and constraints

  • A direct switch concentrated risk at the first production aggregation.
  • A phased transition required temporary dual-source correlation and careful sequencing.
  • Identity backups, connector configuration and data validation were prerequisites.
  • Timing and rollback consequences had to be visible at each go/no-go point.

Architecture contribution

Architecture contribution included structuring connector validation, dual-source correlation testing, primary-source transition, duplicate checks, phased controls and explicit production verification points.

Architecture result

Created a controlled cutover path in which source priority, identity correlation and the points of greatest propagation risk were explicit and reviewable.

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Additional representative contexts

Broader architecture work

Other experience includes enterprise integration and API platforms, architecture governance reset, cloud and hybrid architecture, data retention, enterprise technology roadmaps and program-level solution assurance. Additional decision cases will be published only when their evidence and confidentiality position have been reviewed.

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