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Modernization Strategy

Summary​

HR Suit uses a strangler-fig strategy to extract domain slices incrementally while the monolith remains active and available for routes not yet cut over.

Audience​

  • Solution architects
  • Developers and QA engineers
  • DevOps engineers
  • Product owners and implementation partners

Overview​

The gateway provides a stable entry boundary while configuration controls whether an eligible request is handled by the monolith or an extracted service. A domain slice can be built, backfilled where required, compared with existing behavior, validated, enabled, monitored, and rolled back independently.

Compatibility endpoints may preserve an existing client contract during migration. Shadow routes or comparison paths may support parity assessment without becoming the primary user path. Exact routing configuration is intentionally excluded from public documentation.

The diagram represents a repeatable migration loop, not a claim that every service has completed every stage.

Principles​

  • The monolith remains an active component; it is not described as deprecated.
  • Extraction follows bounded domain slices rather than a single platform-wide switch.
  • Configuration-controlled routing supports cutover and rollback.
  • Existing client-facing contracts can be preserved through compatibility handling.
  • Smoke testing and behavior-parity checks reduce migration risk.
  • Data ownership and event integration move with each slice according to its verified plan.
  • Readiness is assessed per capability and environment.

See Also​

Keywords​

  • Incremental migration
  • Feature-controlled routing
  • Compatibility route

Revision Information​

  • Last reviewed: 2026-07-14
  • Owner: architecture-team
  • Status: Draft