Security guard works at Amazon, and Amazon works to sell his BBQ sauce

SEATTLE – Security guard Spencer Lindsay works three 12-hour shifts a week at an Amazon.com campus in Seattle, watching over the software developers and retail experts who toil to expand the frontiers of e-commerce.

On his own time, the 32-year-old is an internet merchant too, building a business on top of Amazon's own.

A couple of mornings every week, Lindsay borrows the kitchen of a Peruvian restaurant and grocery.

There, in a 10-gallon pot, he cooks various sauces, including barbecue and teriyaki, which he spices with exotic ingredients he plucks from the store's aisles (including chicha morada, a purple Peruvian drink made from corn and Parmesan cheese).

He bottles the sauces himself and labels them with a space-themed brand: Mr. Maurs, an amalgamation of the planet Mars and Lindsay's middle name, Maurice. The motto: "It's out of this world."

Lindsay sells the sauces in person to colleagues at Security Industry Specialists, the contractor that provides guards to Amazon, where he has worked since 2013. He started cooking for profit shortly after taking the job, when the barbecue chicken wings he brought to a work potluck were a success. Word spread and now Amazonians in the know about Lindsay's talents as a saucier seek him out.

But last September, Lindsay shipped four 12-bottle cases of his products to an Amazon warehouse and had them listed on the site, in the hope of striking a chord with Amazonians on their online turf, as well as reaching beyond the confines of the campus. That was only the first shipment; more would follow.

The first orders came from his roster of clients. "I knew everybody," he said. But then an order came from the Southwest. "Arizona? Who is this? Probably a friend of a friend of a friend," he said.

Lindsay's budding business showcases an interesting aspect of Amazon's internet emporium. It's a place where the company conducts its own retail sales, those of big brands and those of major resellers.

But it's also a platform for entrepreneurs building their own mercantile empires from scratch.

Amazon, often criticized for wrecking Main Street retail jobs, highlights that 100,000 merchants on its Marketplace — which is what it calls the platform it offers third-party sellers — each racked up more than $100,000 in sales in 2016. That's meant hundreds of thousands of jobs, the company says.

Another innovation that makes it easier for budding entrepreneurs such as Lindsay to focus on making sauce: a service dubbed Fulfillment by Amazon, or FBA, in which the tech giant handles logistics and shipment.

Amazon's shipping revenue, which include money earned from FBA services provided to merchants, grew to $9 billion in 2016 from $6.5 billion the previous year.

Lindsay says it wasn't until February that his Amazon operation recouped the initial investment of a couple thousand dollars. But he envisions the day when his business grows enough to provide a livelihood for himself — and others. "I want people to work for me," he said.

The hardest part, Lindsay says, is getting noticed among millions of products on the website. That's why he plans to combine his online strategy with an offline, brick-and-mortar stand.

So far he's sold hundreds of bottles of barbecue sauce. He's also attained an important metric in Amazon-land, which helps products become more visible on the site: unanimous five-star reviews.