The National Crime Agency's (NCA) careers website has been struggling to cope with demand as applicants flocked to sign up for cyber crime and intelligence officer jobs.
The NCA has launched a campaign to recruit up to 400 trainee cyber and intelligence officers over the next year, and said that applications would close once it received 8,000 forms.
The applications site went live at 10am on Friday morning, but about two hours later, the NCA said on its official Twitter feed: "High level of traffic to careers site causing issues for some. Try page refresh or different browser. Applications still open."
Applicants took to Twitter to vent frustrations, with many unable to complete their applications on the NCA Careers website.
One applicant, Andy phennah (@phen77), said: "@NCA_UK problems with website, halfway through and web pages unavailable!"
An NCA spokesperson confirmed that some users were unable to access the website, or were experiencing slow page load times, due to the high levels of traffic.
The spokesperson said the problems are of a technical nature, and applicants should be aware that the process is still open, and will not close until the 8,000 job applications limit is reached.
He added that the problems have now largely been resolved as the amount of site traffic has reduced.
The vacancies are open to candidates over 18 years old, with a starting salary of £22,407, rising to £24,717 after two years of training, and are likely to appeal to those looking to start out in the industry.