Payment for services of a non-resident engineer at an hourly rate of $125 would not appear to dependent upon the "use to be made of" or the "benefit to be derived from" such services.
Where a Canadian company enters into a contract with a non-resident engineering company to provide technical assistance which will be rendered outside Canada, with the information derived from the technical assistance to be used in Canada, and a portion of the cost being allocated to the technical assistance services, this would be characterized as a contract for services.