Job vacancies have increased at the sharpest rate for over six years, according to a new report.
The Recruitment and Employment Confederation (REC) said vacancies for temporary jobs increased strongly last month, at its fastest pace for 15 years.
Separate research by Legal & General showed that female workers' confidence about job security has fallen over the past year.
Just over two out of three women said they were confident, the lowest figure since the study began almost two years ago.
Male confidence in job security has remained static at around 74%.
Mark Holweger of Legal & General said: "With the latest Government statistics showing that 74% of all part-time workers are female it's clear that women are often the ones who opt for part-time roles to juggle family arrangements, and they appear to be the ones feeling under the most pressure at the moment."
The REC report said the biggest increase in staff being placed by recruitment agencies was in the North of England, with the slowest in London.
REC chief executive Kevin Green said: "August was an extraordinary month for the UK jobs market, with temp placements growth hitting a 15-year high.
"There is more good news for all workers with pay rates for temps rising for the seventh consecutive month and starting salaries for permanent staff increasing at the highest rate in five and a half years."
Bernard Brown of KPMG, which helped with the study, said: " With retail sales up and the OECD sharply increasing its growth forecast for the UK economy, it's no surprise to see that confidence amongst employers is gaining momentum."