Any development requires testing, and some of our customers reasonably think that it is wise to have separate teams for development and for testing of software. We offer software testing service to our customers that are doing development internally, or outsource development to other companies.
Having testing engineers, familiar with the project, working on a part-time (on demand) basis and for a moderate per-hour rate is very benefitial for the project.
All our engineers know English good enough to be able to communicate via task/bug trackers, email or instant messsengers. We handle stress tests, performance tests and security tests as well.