She returns to Atkins after nearly eight years at Skanska in various senior finance roles at the UK contracting business.
Prior to Skanska, Jarman was finance director at Atkins Highways Services arm.
Jarman replaces current UK and Europe Finance Director Mark Anderson who leaves the company on 21 May to take a career break.
Richard Robinson, Atkins UK and Europe CEO, said: “We welcome Jo during an exciting time for Atkins as we continue to lay the foundations for long term growth by supporting clients in new and innovative ways.
“Jo’s exceptional leadership qualities and her broader commercial experience of joint venture and alliance delivery models will be a great asset to our business.”