NEW YORK—Besides packages, UPS is promising to deliver something else fast: job offers. The package delivery company said Thursday that it plans to hire more than 100,000 people for the busy holiday shipping season, many of whom will get job offers within 30 minutes of applying. UPS needs to snap up workers as fast as it can because of the tight job market. Competition for hourly workers is fierce, and many companies are offering higher pay, sign-on bonuses, and even lowering their requirements, such as hiring those without a high school diploma. Take too long to hire, and an applicant can go elsewhere. “Candidates want instant gratification,” said Matt Lavery, UPS’s global director of sourcing and recruiting. “We wanted to take away as many barriers as we could.” The speedy hiring applies to its most common jobs for seasonal workers: package handlers and driver helpers, who take a package from …