Cundall cut 25 jobs from its UK workforce this summer.
Now the “second wave” of the pandemic has led to another 15 jobs being put at risk with consultations now underway.
Tomás Neeson, Managing Partner, said: “Covid-19 has had an ongoing impact upon our lives and the economy as a whole.
“We have done everything we can to keep our people safe and protect jobs, including utilising the government furlough scheme and reducing working hours to match the current workloads, as our clients and markets deal with the same disruption to their operations.
“The global pandemic has changed the way we do business, and while demand for services in some sectors has ebbed, demand for other services like sustainability, data centres and schools, has grown exponentially.
“As a result of this change in the market, we are reshaping our business to meet this demand and are currently advertising 74 roles across the global business.
“Unfortunately, part of this planning means we have also identified a small number of roles in the UK that are at risk of redundancy. Some of these were identified back in July, however we were able to retain them through consultation.
“Now, as the second wave of the pandemic grips the UK and we accept we will not be returning to the office for some time, we have been forced to examine some of these roles again and are currently consulting on 15 ‘at-risk’ positions across the UK.
“We are exploring options for alternative employment with all those whose roles are at risk.”