Internal System RenewalInternal System Renewal

Renewing personalized, aging internal systems step by step, from reverse-engineering the business requirements.
Rebuild them into a form that endures the next 50 years, without destroying existing assets.

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PROBLEM

Problem

Internal systems
kept alive by "it still works."

Documentation is outdated. The person in charge has left. The business logic lives in one person's head. The renewal discussion has been stalled for years.

Specifications diverge from actual behavior — the impact of change is unreadable.
Business systems that only one person can touch.
SaaS migration is considered, but bespoke requirements cannot be ported to SaaS.
Dependence on the maintenance vendor is high, and cost is structurally rigid.

MIGRATE

What we do

Redesign the operations first,
then swap in the system.

While preserving existing behavior, we reorganize the business process itself. Renewal in the order of "business → information → system."

Reverse Engineering

Reconstruct the current system's behavior and business logic from code, data, and interviews.

Business Redesign

Take the opportunity of renewal to redesign the business process itself to its ideal form.

Phased Migration

With a phased migration plan, switch to the new platform without pausing the running business.

Enablement

Support the operating structure, documentation, and on-site adoption after renewal.

PROCESS

Process

"Disassemble → Redesign → Phased Migration"
— renewal in four steps.

Inventory & Disassembly

Disassemble the current system, business flows, and data. Visualize tacit knowledge — draw the whole picture of renewal.

Business Redesign

Redesign the business process to its ideal form. Clarify the deltas between old and new, and the migration decision points.

Phased Migration

Migrate feature by feature in order of priority — without pausing the old system, planning parallel operation deliberately.

Adoption Support

Training for on-site users, documentation, and knowledge transfer aimed at bringing the work in-house.

OUTCOME

Outcome

Escape from personalization,
and a foundation for the next 50 years.

Reduced operations effort, greater visibility of workflows, and knowledge captured as an asset.
From a foundation that "just runs" to a foundation that "propels the business."

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