The Australian company reported annual revenue of $1.8 billion (NZ$2.1 billion) last year.
Wynyard's managing director Craig Richardson described the win as "a real coup for the company" and said it would be a a test of Wynyard's capability to deliver.
"We understand the increasing governance, risk and compliance obligations that today's critical national infrastructure companies must meet," he said.
Wynyard has developed four software products - risk management, intelligence, investigations and digital forensics.
Its risk management solution, which Queensland Rail is taking on, is already used by Dubai International Airport and Lloyd's of London.
Wynyard employs more than 120 staff across offices in New Zealand, Australia, the US, Canada, Britain and the United Arab Emirates.
It has more than 400 customers around the world, including national security and justice agencies, Fortune 500 companies and infrastructure operators.
The company has forecast revenue of $21.5 million for the 12 months to this December 31 and expects to post a net loss of $10.1 million for the same period.
Wynyard shares were trading at $1.26 this morning, having climbed above the $1.15 initial public offer price after a disappointing start to its life as a listed company last month, when the stock fell as low as $1.07.