"I just felt that my passion was to begin now, going into the industry to really test myself," he told news.com.au.
"From as long as I can remember I've always had an eye for breaking down how things work. and why people get attracted to certain things."
Teaming up with mate Tomic, he embarked on a 12 month process of researching the cosmetics industry, looking for a gap in the market. It was decided that teeth whitening was an underserviced sector ripe for disruption.
After drawing up a detailed business plan, they each chipped in $10,000 and launched the business in December 2014.
"We put a lot of time and effort into product development," Tomic said.
Along with LED light-activated teeth whitening kits, HiSmile's hipster-friendly product line includes a whitening mouthwash made with coconut oil and a teeth whitening pen for "touch ups on the go".
HiSmile products are shipped internationally from a warehouse in Queensland, an expensive approach that Tomic said enabled the company to exercise strict quality control.
"We want to hold onto this for as long as possible because we see enormous value in controlling the product packaging," he said.
Savvy marketing has underpinned the success of the brand, which is targeted at young female millennials.
The first thing Tomic and Mirkovic did when their first batch of product came off the production line was send half of it to social media influencers and bloggers.
"In this day and age, no one's really watching TV ads, no one's really looking at billboards or reading magazines - everyone's on their phones, everyone's on Facebook, Instagram, Snapchat," Tomic said.
HiSmile has hundreds of influencers on its books, from Big Brother contestant Aisha Jade to Australia's Next Top Model veteran Brooke Hogan.
When the company allowed the two women to take over its Snapchat account for a day, they were given complete free rein - with no requirement for HiSmile's products to even feature in the Stories posts.
"We push a lifestyle, rather than just a product," Tomic said.
"When others look at marketing they're looking to sell, we're looking to build a brand and build a loyal customer base ... We took all the methods that worked on traditional media and brought them to today's day and age."
It's an approach based on the philosophy that building a recognisable brand is far more effective than pushing out traditional, sales-based marketing campaigns.
And it's working; six months ago, HiSmile cracked the United States and United Kingdom markets, and the company is expected to turn over $40 million in the next 18 months. That's without any outside investment.
With 45 per cent of HiSmile's customers located overseas, the focus is on building distribution channels to boost the product's reach.
"Our vision and goals are always well into the future, on much bigger and better things," Tomic said.
"The structure we're putting into place now is to prepare us for what's going to happen in the next 24 months."
Ultimately, he said, the company aspired to building a brand as globally recognisable as Nike and Apple.
To those aspiring entrepreneurs wanting to follow in the HiSmile founders' footsteps, Tomic said the key was to "follow your passion and don't stray from it".
"If you have a dream and you have something you want to do, do it 100 per cent passionately," he said. "Understand where your strengths and weaknesses lay and play to your strengths.."
Website: hismileteeth.com
