The sequential ID hack is so old
If I remember rightly it was a website for a large corporate allowing customers to update their details. I think they were selling PC hardware of some sort, printers or something.
But nearly 5 years down the line, have web-backend developers not been made aware of this simple hack by now, simplicity when it comes to data is always your enemy. A pity this is job-applicant data, that kind of stuff is always super-sensitive. I mean if someone helps themselves to your credit-card that's one thing,... pity this makes so many look bad now.