Speaker Corey Johnson is expected to promote an ex-lobbyist to become the Council’s powerful chief of staff.

Deputy Chief of Staff Jason Goldman, once a top lobbyist with the city’s most profitable firm, is poised to replace his boss Ramon Martinez, several Council members told the Post.

The chief of staff advises lawmakers, keeps Council members in line and whips votes. Martinez was the Council’s highest paid employee, making $235,512 last year, and is headed for a gig at Chase bank.

Before Johnson first hired Goldman this winter, he had no experience in city government. Goldman was a VP at Kasirer, which made $11.48 million last year, and worked for the United Federation of Teachers. His Kasirer clients included real estate interests like Brookfield Properties and Forest City Ratner, plus the Hotel Association of New York.

The Council has no policies stopping Goldman from working on issues impacting his former clients. But he would have to recuse himself from discussing Charter Communications, where his wife Camille Joseph is currently a lobbyist.

“Goldman working for the Council can meet today with the very clients who employed him yesterday,” said Alex Camarda, a senior policy adviser for good government group Reinvent Albany.