Rahul Seth (23), who hails from Bihar, was arrested yesterday from his rented accommodation at Baguiati in the city by cyber crime section of Bidhannagar Police for the alleged act, a senior police officer said.
He had quit the company in December last year after working for six months.
Two of Seth's allies, who were also employees of the same company at Sector V of Salt Lake - Mazharuddin Ahmed and Manish Ghosh - were apprehended earlier, he added.
The company had lodged a complaint with the cyber crime section of Bidhannagar Police on January 11 that one of its UK clients had written to it saying that records of their consumers had been compromised.
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On the modus operandi, the police officer said Ahmed and Ghosh used to store data in a cloud address and later downloaded them into pen drives to pass it on to Seth.
Then Seth, pretending to be an official of the company, used to speak to the clients asking them to deposit the fees for technical support in his account since the company's account number had changed, the officer said.
The money was then divided among the three with Seth getting the maximum share.
A cell phone, an ATM card, a bank passbook and Rs 22,900 have been recovered from Seth, who has been booked under various sections of the IPC and the IT act, he said adding that the man has been sent to four days' police custody.