Putnami
Legacy system operability

Can your team safely change the system nobody fully understands?

Long-lived systems contain valuable behavior and accumulated constraints. When that knowledge is implicit, every meaningful change becomes an archaeology project and every delay makes the next change harder.

Discuss one real change

A focused, evidence-led conversation. No platform migration required.

One change, made visible

Start with the unknowns around one avoided change.

putnami change scope customer-ledgerone change · revision-specific
Repository facts narrow the archaeology; unresolved human and operational knowledge stays visibly unresolved.
The problem in practice

The system still runs, but confidence in changing it has eroded.

Repository archaeology
Engineers reconstruct architecture and behavior from code paths, tickets, and people before editing.
Fragile confidence
Green checks coexist with fear because nobody knows which important behaviors they do not cover.
Implicit boundaries
Data contracts, integrations, and operational assumptions appear only when a change violates them.
Postponed change
Necessary work is delayed, narrowed, or routed around because understanding feels too expensive.
The question

What would a capable non-author need to know and prove before changing this system?

The goal is not to document everything or rewrite the system. It is to make one consequential change understandable enough to execute and recover safely.

One-change test

Choose one change the team has been avoiding.

Trace the knowledge, dependencies, constraints, and evidence required to move it from uncertainty to a bounded decision.

  • System facts that can be derived from the repository and those that cannot.
  • People and historical artifacts required to recover missing intent or constraints.
  • Evidence needed to distinguish a safe change from a hopeful one.
  • The smallest durable context that would make the next non-author faster.
Start a client conversation

Bring one representative change. Leave with a clearer decision.

Leave your work email. Fabien will reply directly to understand the system, select a useful change, and decide whether a bounded engagement makes sense.

No newsletter sequence. No release waitlist. One direct conversation.