Space Systems Integration (SSI) is a fast-growing engineering company that provides aerospace solutions to a variety of government and commercial customers. Our employees are forward-thinking, self-directed individuals who are committed to solving our customersâ technical challenges. SSI is seeking a Spacecraft Systems Engineer (V&V) in Chantilly, VA. This role requires an active TS/SCI clearance with Polygraph. The Spacecraft Systems Engineer will support a program office for a Major System Acquisition that requires a mid-career engineer with technical expertise in systems engineering who is anxious to grow their skills.