avista Engineering Services on the transdigm group provides safety-critical and mission-critical software development and systems engineering services to the leading aerospace defense medical and industrial manufacturers in the world. Since 1987 we have led the industry with the right combination of people and processes and a deep commitment to the success of our clients. With the most experienced do-178b development team in the industry, the team works right the first time, delivering high-quality results for a lower overall cost.