Former JPMorgan banker and Wall Street high-flyer Chirayu Rana has hired an attorney who has repped Epstein accusers and other major sexual harassment cases in his legal battle with the nation’s largest bank over claims Rana was forced to be a “sex slave.”

Daniel Kaiser, partner at top NYC law firm Kaiser, Saurborn & Mair, is representing the 35-year-old money man — dubbed “John Doe” in court filings — who last week filed a bombshell lawsuit against JPMorgan executive director Lorna Hajdini replete with “fabricated” claims that she drugged and sexually assaulted him.

The financial giant has vehemently denied the allegations, with a JPMorgan spokesperson telling The Post that the suit is entirely fabricated, and that an internal investigation turned up no evidence of his salacious claims, noting Rana “refused to participate and declined to provide facts” to support his assertions.

Rana’s initial filing, which claims emotional distress and alleged reputational harm, was yanked from the court docket within hours, listed as “returned for correction,” but refiled days later with a handful of new lurid claims.

“A motion was filed today to seek an order to permit my client to proceed by John Doe. Those papers attach corroborating evidence of his claims. And there is much more,” Kaiser told The Post in an email at the time of the refiling.

According to sources familiar with the case, JPMorgan offered Rana $1 million to drop his claims. Rana refused and demanded a payout “north of $20 million.”

Kaiser did not respond to requests for comment.

He has represented multiple women with legal claims against Epstein, the notorious sex trafficker who hanged himself in a Manhattan jail cell in 2019, including Jennifer Araoz, 38, a New York woman who said he groomed her for sex since the age of 14.

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Follow the latest on the bizarre JPMorgan banker ‘sex slave’ allegations:

• Ex-JPMorgan banker Chirayu Rana made eye-popping, 8-figure settlement demand before filing ‘fabricated’ ‘sex slave’ suit: sources
• Chirayu Rana was referred for mental treatment by DA’s office after probe into ‘sex slave’ claims found nothing: source
• Ex-JPMorgan banker files wild new claims against exec — including lurid threesome invitation — days after going viral with ‘fabricated’ sex slave allegations
• Chirayu Rana pretended his dad was dead to get bereavement leave — but he’s alive and spoke to The Post this weekend

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Days after Epstein’s suicide, Kaiser appeared on MSNBC to talk about Araoz’s state of mind and the status of her suit against Epstein’s estate as well as his accomplice, Ghislaine Maxwell, who was convicted of procuring young girls for him.

“Jennifer is somewhat angry that Mr. Epstein is no longer alive to face justice. She was looking forward to having him account for himself in a court of law, both criminally and civilly, so there’s some frustration about that, that he’s no longer here so she can look at him and see him face the full weight of the justice system,” Kaiser said.

“But at the same time she’s committed to seeing this through to the end. She has a civil lawsuit that will still permit her to receive a measure of justice both from the estate of Jeffrey Epstein as well as the enablers around him, and there were a lot of enablers around him.”

Through a spokesperson, Kaiser declined to comment further on Rana’s case after previously asserting his client’s allegations are valid, and claiming The Post would be “embarrassed” by its reporting on the viral lawsuit once the full evidence comes to light.