Pega Certified Senior System Architect (PCSSA) is a certification issued by Pega Systems, a software company that specializes in developing customer engagement and digital process automation platforms. PCSSA certification validates the expertise of individuals in designing and implementing Pega-based solutions, understanding Pega concepts, and applying best practices in developing applications using Pega technology. This certification is targeted towards professionals working in the field of Pega and helps them demonstrate their skills to potential employers.