Five-year contract aims at cutting costs and standardising service.
Construction company Balfour Beatty has enlisted Fujitsu to overhaul its fragmented IT infrastructure in a £43m deal.
The five-year contract tasks Fujitsu with condensing Beatty's extensive IT estate, which comprises more than 1,500 UK servers in 10 data rooms, due to rapid expansion in recent years.
By consolidating this into Fujitsu's two London-based data centres and cloud-based storage, Beatty hopes to reduce its costs by 25% as well as cutting energy consumption.
The global organisation which runs operations in more than 80 countries, also hopes to base all end user devices on Fujitsu technology, to make its fragmented IT infrastructure a more consistent and joined-up service.
Fujitsu will also provide desktop services and support for 14,000 UK staff across 900 permanent and temporary work sites, with its Lifebook laptop and Esprimo desktops becoming the standard devices for staff.
By standardising IT equipment Beatty hopes to ensure a smoother user experience with faster response times to any issues.
Danny Reeves, CIO of Balfour Beatty's services division, said: "Fujitsu's experience in working with public sector organisations made it a natural choice. We are taking great strides forward in the way that we use technology as a business - and to help us better engage with our customers."
Richard Bull, executive director of end user services at Fujitsu UK & Ireland, added: "The objective here is to create an agile and scalable IT environment, that provides Balfour Beatty with the ability to flex according to its customers requirement - as well as helping to reduce IT costs.
"It is also giving Balfour Beatty the opportunity to truly innovate its business - and to future proof for trends such as BYOD."