Victoria Brambini will take up the new role as managing director in January.
The consortium, comprising Pick Everard, AECOM and Gleeds, was formed in 2016 to deliver the four-year £350m National Built Environment Consultancy Services framework for Scape Group.
To date, Perfect Circle has delivered more than 750 projects to over 220 clients.
Brambini said: “I’m delighted to be leading the next stage of progressing the joint venture into an even higher performing and sustainable organisation.”
She joined Scape in 2014 having previously worked client side as director for places at Rutland County Council.
Richard Whitehead, chairman of Perfect Circle, said: “Victoria joins us at a pivotal time in our evolution, as we make plans for further expansion and continued initiatives on achieving the best value for clients.
“There are tremendously exciting times ahead as we continue to build upon our excellent relationship with Scape and deliver a comprehensive suite of services.”
The services available under the BECS framework include: project management, quantity surveying, building surveying, commercial surveying, architecture and design services, civil and structural engineering, highways consultancy and engineering services and strategic asset management.