It lists around 1 million UK job vacancies. The large database of job ads collated by the service has allowed the company to produce a number of statistics about trends in the employment market.
In November 2012, it was reported that Adzuna's job and housing market data was being supplied to the "Number 10 Dashboard", an app built by the UK's Government Digital Service to keep Prime Minister David Cameron and others up to date on key economic indicators.
In April 2013, Adzuna announced the launch of its job search engine in five additional countries—Germany, Canada, South Africa, Australia and Brazil. In January 2014, Adzuna also launched in France, The Netherlands, Poland, Russia, and India
Adzuna was founded in 2011 by Andrew Hunter, former head of marketing of Gumtree and VP of marketing at Qype, and Doug Monro, former MD of Gumtree and COO of Zoopla. The beta site was launched in April 2011 with £300,000 seed investment from Passion Capital and Angel Investors, followed by a public press launch in July 2011. In January 2012, Adzuna announced further investment of £500,000 from Index Ventures and The Accelerator Group to expand into other verticals and countries. In April 2013, Adzuna raised a further £1M from the same investors. In July 2015, Adzuna raised an additional £2M from over 500 investors via a crowdfunding campaign on Crowdcube. 
Adzuna was named by Startups.co.uk as one of the top 20 UK startups of 2011, and by V3 Magazine as one of the top ten up-and-coming UK technology startups of 2013. In the same year it was also listed by Wired as one of the top 10 startups in London and in 2015 was named to UK government agency Tech City's 'Future Fifty' high growth startups accelerator.