Douglas joined RSHP in 2007, initially working on a proposal for a 26-storey office building in Broadgate in the City of London. Following this, he contributed to the detail design of the now completed Conservation and Exhibitions Centre at the British Museum.
From 2009-11, Douglas was a key member of the design team working on the headquarters of the BBVA Bancomer bank, a 50-storey office tower in Mexico City. He helped develop the brief from the winning competition design The completed building has won many awards and forms an important urban landmark on the skyline of Mexico City.
In 2011, Douglas worked on the extension to Geneva Airport, Aile Est, which reached Practical Completion in July 2021. Douglas was involved from an early stage of concept design developing the services and operational strategies. His role evolved such that by tender of the main superstructure and fit-out he was leading the RSHP team and in turn the design lead for the wider design consortium; RBI-T. He has led the project through the construction stages to completion, acting as design guardian throughout. Despite its size and complexity, the client opted for a traditional procurement route which gave the design team considerable control of the detail and finishes, but also a great deal of responsibility in terms of documentation and contract administration.
Between 2021 and 2023, Douglas relocated to Melbourne, Australia, to provide support to the site team on the Metro Tunnel Project, currently under construction.
In June 2023, Douglas assumed the role as project architect of the Scène Digitale - a new E-Sports hub located in Thiais to the south of Paris. The urban block that has an auditorium at its heart is destined to become the national home of e-gaming when it opens in 2028. The feasibility stage was completed in December 2023.