I'd say any app that will do any kind of (more than simple) data manipulation. If you plan to support more and more data formats, things will get exponentially worse.
One domain where I'd go with Lisp/Clojure/Scheme any day are banking/financial switches - software used to communicate between banks, card providers, POS devices, even ATMs. These programs usually has to support tons of weird binary protocols (among other things), designed in 70-ties and 80-ties. To make matter worse, bigger banks adds own "juice" to those protocols, making hybrid monstrosities. And usually, you can't find documentation about those protocols, unless you are deeply in banking business.
i would think elixir and erlang suit that better. they both have beautiful binary pattern matching built in, and are perfect to wrap up disparate pieces that talk to each other. they also share some commonality with common lisp that a lisper should like.
One domain where I'd go with Lisp/Clojure/Scheme any day are banking/financial switches - software used to communicate between banks, card providers, POS devices, even ATMs. These programs usually has to support tons of weird binary protocols (among other things), designed in 70-ties and 80-ties. To make matter worse, bigger banks adds own "juice" to those protocols, making hybrid monstrosities. And usually, you can't find documentation about those protocols, unless you are deeply in banking business.