[1] After graduation, Hirman worked as a journalist for the Czech Press Agency as well the Slovak Economic weekly Trend, covering the Commonwealth of Independent States and energy topics.
[3] Herman was in charge of implementation of a large-scale energy consumption optimization project funded by the European Investment Bank in the Prešov region.
He also advised the Christian Democratic Movement and the Progressive Slovakia parties on their energy policies.
He also served in the team of Ivan Mikloš advising the Ukrainian prime minister Volodymyr Groysman.
[4] Following the abdication of Richard Sulík, Hirman was included in the government as a Minister of the Economy on 13 September 2022.