Chirchir became a senior manager at Telkom Kenya. He also served as the secretary general for the United Republican Party (URP), between 2011 and 2013. Chirchir is credited for Jubilee's successes in the 2013 and 2017 general elections where Uhuru Kenyatta defeated Raila Odinga, emphasizing his credentials as a political operative.[2]
Previously, Chirchir served as the Interim Independent Electoral Commission's (IIEC) Director of Information Technology.[3] In 2017, he was appointed Chief presidential agent by President Kenyatta.[3]
Having been President William Ruto's close ally for years, Davis also served as Chief of Staff in the office of Deputy President, following the death of his predecessor Amb. Kenneth Osinde, ahead of the 2022 General Elections.[2][4]
On 27 September 2022, he was appointed by President William Ruto as the Cabinet Secretary in Charge of Energy and Petroleum, the same Ministry he was appointed to by retired 4th President Uhuru Kenyatta.[5] He was dismissed by President William Ruto on 11 July 2024, along with almost the entire cabinet, following anti-government protests that put pressure on the President to act by dissolving his Cabinet and reconstituting it afresh as part of a series of demands by Gen-Z protesters, who have been actively demonstrating since June 2024, due to the high cost of living and the now defunct Finance Bill 2024 that would have increased taxation and other unfriendly measures on Kenyan citizens.[6]
Davis Chirchir was reinstated in the Cabinet on 8 August 2024 in the position of Cabinet Secretary for Roads and Transport, succeeding Kipchumba Murkomen.