Terry grew up on a dairy farm and after graduating with an MEng from QUB in 1995 spent the next 9 years working in a Software Architect/Management role for various telecommunications companies e.g. BT around the world including Silicon Valley, Canada and China. His primary role in this time was managing a number of datacomms related projects.

In 2004 he founded FarmWizard, a cloud based software product which allowed livestock farmers to easily maintain legislative and performance records. The product was architected and developed by Terry on the Microsoft technology stack and sold both directly and indirectly to farmers growing a large customer base worldwide. As the world’s first cloud based livestock management system it attracted the attention of a number of enterprises across the protein supply chain. FarmWizard now manages over 4.2m animals worldwide. Terry grew the company to 10 people prior to the acquisition. In 2015 FarmWizard was majority acquired by Wheatsheaf, part of the Duke of Westminster's £15bn Grosvenor group with the remainder of the company being acquired from Terry in 2018.