A: Did you sign the contract with that company that intended to hire you?

B: No, I didn’t. When I went for the interview it looked like a fly-by-night company, so I turned them down.

Note: “Fly-by-night” as an adjective conveys the idea of being untrustworthy, irresponsible, or dishonest. As a noun, it refers to a person who seeks to evade responsibilities, particularly by absconding under the cover of night to avoid settling debts, or to a dubious business lacking an established reputation.