Besides niche languages, there are also niche roles.
For example, Data Engineers and DevOps Engineers are both in low supply and high demand.
I've worked at two companies (Apple and Spotify) that I'm pretty sure I would never have been able to get into as a "common" engineer or data scientist with thousands of other applicants for the same role.
I've worked at two companies (Apple and Spotify) that I'm pretty sure I would never have been able to get into as a "common" engineer or data scientist with thousands of other applicants for the same role.