In return, the brewery offers 48 bottles of craft beer a month for six months, as well as $100 a month to spend at Croucher's Brew Bar in Rotorua, and a couple of T-shirts.
Brewery owner Paul Croucher says the idea is to help support the local ultramarathon.
"It's an incredible event and pretty amazing runners travel from all over the country and the world to compete right here in our own back yard," he said.
The unsual job ad has been well received within the running and drinking community, with many putting their hand up for the ambassador role.
"We've been stunned by the fantastic response to the best job in the world, it's been awesome and really looking forward to picking our winner," Croucher said.