Today, Monster is the largest job search engine in the world, with over a million job postings at any time and over 150 million resumes in the database (2008) and over 63 million job seekers per month. The company employs approximately 5,000 employees in 36 countries. Its headquarters are in Maynard, Massachusetts.

Monster also maintains the Monster Employment Index.

Jeff Taylor founded The Monster Board and served as CEO and "Chief Monster" for many years.

Jeff Taylor contracted Christopher Caldwell of Net Daemons Associates to develop a facility in an NDA lab on a Sun Microsystems Sparc 5 where job seekers could search a job database with a web browser. The machine was moved to sit under a router in a phone closet in Adion (a human resources company owned by Taylor) when the site went live in April 1994.

Initially, the site was populated with job descriptions from the newspaper segment of Adion's business with the permissions of the companies advertising the jobs.

Later in 1994, The Monster Board issued a press release that was picked up and provided needed exposure to drive people to the web site. Monster was the first public job search on the Internet; first public resume database in the world and the first to have job search agents or job alerts.

When TMP acquired Adion, the site was moved into BBN Planet's web hosting facility where it grew from 3 SPARC-1000s to become the centerpiece of the globally distributed network it is today.

TMP went public in December 1996, with its shares traded on Nasdaq under the symbol “TMPW”. In 1998, TMP acquisitions expanded the Recruitment Advertising network. TMP became one of the largest recruitment advertising agencies in the world.

In June 1998, The Monster Board moved its corporate headquarters out of a small office above a Chinese restaurant in downtown Framingham, Massachusetts to an old textile mill in Maynard, Massachusetts that formerly housed Digital Equipment Corporation.

In January 1999, The Monster Board became known as Monster.com after merging with Online Career Center, another of TMP Worldwide's properties. The first post-merger president of the new Monster.com business was Bill Warren, the founder of Online Career Center. Bill Warren received the 1997 Employment Management Association's prestigious Pericles Pro Meritus Award, an honor presented by EMA/SHRM in recognition of being the founder of online recruiting on the Internet.