Associated with the water industry since 2003. Started work at Przedsiębiorstwo Wodociągów i Kanalizacja Spółka z o.o. in Gliwice as a Specialist-Financial Controller, was promoted to the position of the Manager of the Project Implementation Unit in 2005, and then became the Strategy and Development Director.

From 2013, a Proxy of the Management Board, and later the Director of the Project "Construction of the Podium modern sports and entertainment hall in Gliwice" (currently Arena Gliwice). In 2016, became a Signing Proxy, and in August 2016, a Member of the Management Board of the Company. Between February 2020 and June 30, 2021, the Vice-President of the Management Board. On June 4, 2022, appointed a Member of the Management Board of Kraków Water.

Katarzyna Jachymska graduated from the Faculty of Management at the University of Economics in Katowice and the Faculty of Law and Administration of the University of Silesia in Katowice. Attorney, Ph.D. in law, completed MBA studies at the Warsaw School of Economics. Licensed to serve on Supervisory Boards. Member of the Council of the Chamber of Commerce in Gliwice.

In her eighteen years of experience in the water supply industry, she was responsible, among others, for spending pre-accession funds, obtaining EU funds for investments in water supply and sewage infrastructure and the implementation of these projects worth PLN 450 million in total. At the same time, in the years 2013-2021, she was responsible for the construction and operation of one of the three largest entertainment and sports facilities in Poland – Arena Gliwice.