The most powerful person in Rep. Alexandria Ocasio-Cortez’s office is a tech millionaire with homes in the West Village and Maryland, who is behind a set of inter-related companies raising ethical eyebrows with good-government groups.

Saikat Chakrabarti, 33, is the hard-left freshman’s chief of staff — the brains behind initiatives like the Green New Deal and the founder of a trio of companies that catapulted Ocasio-Cortez into Congress.

But those companies raise red flags with government-watchdog groups who say Chakrabarti may have skirted campaign finance law.

Ocasio-Cortez’s campaign paid Justice Democrats, a Tennessee-based PAC founded by Chakrabarti, a total of $41,108.59 for “campaign services” and “strategic consulting” in 2017 and 2018, Federal Election Commission filings show.

But PACs are not vendors and cannot provide more than $5,000 a year worth of services for any single candidate, according to FEC regulations. If candidates go above this amount, they need to seek advice directly from the FEC.

“They believe their cause is so great that they don’t have to play by the rules,” said Tom Anderson, who heads up the Government Integrity Project at the National Legal and Policy Center in Virginia, a conservative watchdog group. “They believe that they are above campaign finance law.”

“It was payment for services,” Ocasio-Cortez spokesman Corbin Trent told The Post, insisting that both the campaign and the PAC followed FEC rules and that they sought advice from an elections lawyer.

Brand New Congress, another PAC that Chakrabarti founded to support lefty candidates, paid Ocasio-Cortez’s boyfriend $6,000 in 2017, filings show. The payment to Riley Roberts was made at the same time that Ocasio-Cortez’s campaign paid Brand New Congress LLC $18,880 for “strategic consulting.”

Chakrabarti justified the payment last month, saying it was for online fund-raising services, but a conservative watchdog group disagrees.

“The timing and amounts of these transactions, the use of two affiliated entities as intermediaries, the vague and amorphous nature of the services Riley ostensibly provided, the magnitude of these transactions compared to both the limited funds the campaign had raised at the time . . . and the romantic relationship . . . collectively establish reason to believe these transactions may have violated campaign finance law,” reads an FEC complaint filed last week by the Coolidge Reagan Foundation.

An FEC spokesman refused to comment Friday, citing a rule that the agency could not publicly discuss individual campaigns.

“We believe that complaint is politically motivated, basically intended to create a political story,” Trent said, adding that Chakrabarti was no longer involved with the groups he founded when he became AOC’s campaign manager in February 2018.

Chakrabarti, who grew up in Texas and graduated from Harvard with a computer science degree, directed social-media tech for Democratic Sen. Bernie Sanders’ 2016 presidential campaign.

That same year he launched Brand New Congress in hopes of boosting hundreds of young, progressive candidates into public office.

As chief of staff, Chakrabarti is being paid $52,000 annually — far below the Capitol Hill average of $145,000 for the job — so that Ocasio-Cortez can pay her entry-level staffers the same $52,000 salary.

“Leadership starts with our choices,” Ocasio-Cortez tweeted on Feb. 22. “We pinch pennies elsewhere, but it’s worth every dime to pay a living wage.”

Under congressional ethics rules, staffers who earn less than $126,148 are not required to report assets and other income.

Additional reporting by Mary Kay Linge