Yeah my "niche" right now is consulting for companies that are high revenue but built out their platforms during lean times where they were focused on growth over stability, reliability, or security. "Legacy code" I guess though it's a little more varied than that might imply.
Basically the only two technologies I touch these days are rails and php. I'm not filtering out other tech stacks, these two are just absolutely dominant for this type of company.
The place I'm thinking off that I know uses PHP for everything is a bricks and mortar retailer/manufacturer, I think last time I looked their revenue was ~£500m a year.
Their software was however awful in the worst ways :).
Basically the only two technologies I touch these days are rails and php. I'm not filtering out other tech stacks, these two are just absolutely dominant for this type of company.