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I had a manager who had a job posting for a COBALT programmer. He couldn't find a single one

Did you mean COBOL or did he misspell it and that's why he couldn't find one?

From the context, I'd surmise it's the latter.

Yup, I had one who was looking for someone with "Mongoose DB" experience.

Mongoose is the name of the NodeJS ORM for Mongo.

Yup, but trust me, he didn't know that.