In 1997, Yefymenko graduated from the Economics Faculty of Taras Shevchenko National University of Kyiv with a degree in Accounting and Auditing.

[3][4] In 2015, Yefymenko ran for mayor of Bila Tserkva, but lost in the second round to Henadiy Dikiy, who received 39.3% of the votes cast.

The UK-based subsidiary, Tribo Rail, supplies products to European markets and works with Siemens, Bombardier, Alston, and other well-known manufacturers in the field of railway technology.

The Foundation implements and supports socio-cultural, educational, health care, historical, tourist, and other programs related to the city's life and development.

The excavations took place in three stages: the first involved the transfer of the monument to Yaroslav the Wise, the second investigated the construction of a religious building, and the third resulted in the museification of the foundations (one and a half apses) of the ancient temple of the thirteenth century.

[20][21] The Foundation has implemented a number of social projects aimed at supporting the most vulnerable segments of the population: "Academy of Pensioners", "Help to have a child", "Start of Hope", "Spartakiad", and nominal scholarships for the best students.