Krzysztof Bolesta is an appointed official of the European Commission, where he worked from 2004 to 2012 and from 2020 to 2024. From 2000 to 2004, he supported the accession negotiations and Poland's adaptation to EU requirements in the areas of 'energy' and 'research and development'.

Between 2012 and 2015, he was a member of the political cabinet of two Polish Ministers of the Environment and a member of the supervisory board of the provincial branch of the National Fund for Environmental Protection and Water Management in Lublin. He was involved in the negotiation regarding the second European energy and climate change package. In addition, he served as an advisor to the President COP19 (United Nations Climate Change Conference). 

From 2016 to 2018, he was a research director at the Policy Insight think tank. Moreover, he co-founded the NGO, the Foundation for the Promotion of Electric Vehicles, where he served as vice-president from 2018 to 2020.

He participated in two Euro-Atlantic exchange programmes, the US State Department's International Leadership Programme and the German-American Marshall Fund programme.

In 2014, the President of the Republic of Poland awarded him the Silver Cross for services to strengthen and develop European integration.