Aker Solutions said employees had been told about 650 positions, mainly in the UK, Norway and India, may be affected.
A more specific breakdown for Aberdeen and London jobs has not been announced.
A spokesperson said: "The adjustments are being made because of the continued market slowdown and as part of a global reorganization that will strengthen the company's competitiveness."
Aker employs about 15,000 people, of which more than 2,000 are in the UK, the majority of them in Aberdeen and offshore.

Choity Khatun, who is three, was born with caudal twinning, meaning that part of a twin had developed in her pelvis.
Australian surgeons spent months working out how to remove the extra limb and reconstruct her pelvic area.
The toddler was brought to Australia from her village in Bangladesh by a charity, Children First Foundation.
Dr Chris Kimber, head of surgery at Monash Children's Hospital in Victoria, said Choity's case was very rare and the surgery had been "daunting".
"The operation is sort of determined by the individual and you have to spend a lot of time trying to analyse what's there and then plan a procedure that takes that into account," he told the Australian Broadcasting Corporation.
The Australian team held extensive discussions with doctors in Bangladesh, who had already performed some surgery.
The team had to determine whether further surgery was even possible or beneficial before she was brought to Australia last year.
Doctors in Bangladesh had removed part of the leg "but she was still left with a large mass sitting there in her pelvis between her two normal legs", Dr Kimber said.
"Because there's part of a twin in there, she had two rectums, two vaginas, potentially two anuses - double bits that were growing into a very abnormal area."
After a lengthy planning process, the team embarked on the surgery in November.
They removed the part of the leg that was left behind and carried out reconstruction work to ensure the little girl was continent - something that will help her to function much better back at home.
Dr Kimber said the toddler, who is partially blind, was now walking and running around, and had put on weight.
He said she might need further corrective surgery during her teenage years but would be able to return home to Bangladesh with her mother "without medication or surgical aids".
Her mother, Shima Khatun, told Australian media on Thursday she was looking forward to going home to her family and watching her daughter play.
"Everything is good nowâ€¦ she can play like other babiesâ€¦ she is the same [as them]," she said.

Crews were called to the blaze at a building in Stewartville Street, in Partick, at about 12:15.
The fire broke out in a communal area of the block. Four people were treated at the scene for the effects of smoke inhalation.
The blaze triggered a large response from the emergency services.
A spokesman for the Scottish Fire and Rescue Service said: "On arrival crews found a well-developed fire on the third floor of a six-storey residential block of flats with residents unable to leave the building.
"Firefighters quickly brought the fire under control, whilst at the same time rescuing 17 people from the property, some of whom were suffering from slight smoke inhalation and minor injuries."
Crews worked through the night to deal with any fire spread and make the scene safe.
A spokeswoman for Police Scotland said: "About 25 to 30 persons were evacuated."
The Scottish Ambulance Service sent four resources from their special operations response team, two A&E ambulances and an ambulance car.
A spokesman said: "We did not transport anyone to hospital. We dealt with smoke inhalation."

The crash happened at about 17:35 GMT.
A woman was also injured in the crash, but her injuries are not believed to be life threatening.
Police have appealed for anyone who witnessed the crash to come forward.
Hundreds of jobs are set to go at oil services firm Aker Solutions with about 100 at risk in Aberdeen and London.
[NEXT_CONCEPT]
A Bangladeshi toddler born with a third leg attached to her pelvis is returning home after successful surgery in Australia.
[NEXT_CONCEPT]
Firefighters have rescued 17 people from a six-storey block of flats in Glasgow's west end after a serious fire left them trapped in the building.
[NEXT_CONCEPT]
An 18-year-old man has died after being injured in a two-car road crash on the Lisburn Road in Saintfield, County Down on Wednesday.