My understanding, based on the documents I've seen, is that GC Strategies worked as a subcontractor to another firm prior to the pandemic. I don't believe there was a specific contract with GC Strategies, but I might be mistaken on that. I can come back in writing to clarify.
However, before the pandemic, they were a subcontractor to another company, and the individuals who were working with CBSA staff on a mobile application were the same individuals who came in to work with CBSA staff on ArriveCAN.