Online job adverts fell by 1.6% in September from August, bucking the usual end-of-summer bounce in job postings, and advertised salaries fell by the same amount, Adzuna said.
"September traditionally sees a surge in job market activity but the figures we're seeing this year could signal a cooling off of the job market, which had shown signs of resilience earlier in the year," Adzuna co-founder Andrew Hunter said.
The Office for National Statistics said earlier this month its measure of job vacancies fell to a two-year low of 988,000 in the three months to September.
Separately on Monday, a survey showed small businesses recovering a bit of their lost confidence but the overall mood remained negative.
Martin McTague, FSB's national chair, said the survey showed signs of stabilisation after 18 months of surging costs.
Persons:
Adzuna, Andrew Hunter, BoE, Martin McTague, McTague, Suban Abdulla, William Schomberg, Andy Bruce
Organizations:
Bank of England, National Statistics, Federation of Small, Hospitality, Thomson