He was initially reluctant to enter the academy, but decided to go forward after knowing that he would be required to pay back all of his education if he withdrew.

[2] Kristomei began his career in the Army Strategic Reserve Command and was sent to Aceh, which at that time was declared as a military operation region due to the activity of insurgents.

[2] Aside from his duty as battalion commander, Kristomei was also involved in writing Indonesia's Ministry of Defense 2014 white paper.

[7] He ended his assignment in Tanggamus on 22 April 2016[8] and returned to the Army Strategic Reserve Command as the deputy assistant for operations.

[11] He handed over his position as information chief on 2 August 2019[12] and underwent advanced military education at the Indonesian Armed Forces Staff and Command School.

[11] Kristomei was sent to North Sumatra after his education and became the assistant for operations in the Bukit Barisan Regional Military Command on 29 June 2020.

Kristomei was instructed by the assistant for operations to the army chief of staff, Major-General Surawahadi, to establish a COVID-19 response team for the Bukit Barisan Regional Military Command.

[14] Aside from his duty as assistant for operations, Kristomei was then appointed as a member of the public communication team of the COVID-19 Response Acceleration Task Force.

Kristomei was noted to host several talkshows by the COVID-19 Response Acceleration Task Force to educate the public regarding the government's policy on the COVID-19 pandemic.

Kristomei was married to Dezi Asti Megasari,[1] a former journalist and reporter for the Liputan 6 news program[23] on 15 September 2005.