I'm interested in writing parsers, but my experience is only with small scale web editors for specific type of documents full of business rules e.g user write

I'm interested in writing parsers, but my experience is only with small scale web editors for specific type of documents full of business rules e.g user write documents with something like markdown and then editor renders document with things like auto numeration, displaying other referenced elements by syntax e.g '@element2' Does there exist job in writing parsers?