You are paying to get back to zero.

That is what a "full rewrite" is.
You burn $300K. You freeze the roadmap.
Just to rebuild exactly what you already have today.

Your lead dev promises it will take 4 months. It takes 12.
Why? Because he is bored.
Greenfield code is fun. Reading 5-year-old spaghetti code is painful.
So he sells you the rewrite.

"We can't scale with this," he says.
Yes, you can. You just don't want to.

The fix is a quarantine.

Isolate the rot.
Draw a hard line in the sand.
Anything new gets built in a separate, modular monolith.
Anything old stays in the legacy one.

The execution:

1. Set up a reverse proxy to route traffic to the old or new app.
2. Implement a hard policy: zero new features in the legacy codebase.
3. Bugs: Fix them in legacy (critical only).
4. New features: Build ONLY in the new modular monolith.

Enhancements? Rewrite that specific slice. Route traffic there.

Do not build an API between them:

1. Connect the new app to the old DB. Direct access.
2. Create new tables for new features.
3. Treat legacy tables as read-only.

Yes. You create a hybrid monster.
Yes. The architecture diagram looks like a fucking mess.

But you ship. You survive. You pay the debt when it matters.

Ugly revenue beats beautiful nothingness.