(KRON) -- An East Bay man was sentenced to 18 months in federal prison for overwriting data on his former employer’s computer systems after being informed that his employment was being terminated, the Department of Justice announced Thursday. Vamsikrishna Naganathanahalli, 49, of Dublin, worked as a senior Oracle Human Capital Management (HCM) architect for MedAmerica, Inc. from October 2018 to June 2022, according to the DOJ. MedAmerica, Inc. is part of the Emeryville-based healthcare organization Vituity. The HCM platform that Naganathanahalli worked with is used to organize human resource data for Vituity’s approximately 7,000 employees, according to prosecutors. On May 28, 2022, Naganathanahalli was informed that his employment with Vituity was being terminated. The senior architect admitted in a plea agreement that after he was told he was losing his job, he used his privileged system access to change the password for another employee who also had privileged access. In early September, after Naganathanahalli stopped working for Vituity, he admitted to using the altered employee’s account to change an HCM password for a contractor, the DOJ said. Later that same day, he used the contractor’s account to load files containing “dummy” data, replacing real data in the system. Recalled Oakland Mayor Sheng Thao indicted on federal bribery charges Naganathanahalli admitted, prosecutors said, to overwriting data for approximately 90 percent of current and former Vituity employees. The Justice Department said that the total loss to his former company was at least $400,930. The former Vituity architect pleaded guilty on Aug. 15, 2024, to three counts of “knowingly causing the transmission of a program, information, code, or command, and as a result of such conduct, intentionally causing damage without authorization, to a protected computer,” the DOJ wrote in a news release Thursday. Naganathanahalli was ordered to pay $400,930 in restitution along with serving the 18-month prison sentence, which begins July 20, 2025.