who are the different stakeholders involved in different phases of SDLC

Planning/Requirements Analysis : Clients/Customers, project managers, Subject Matter Experts (architects, business analysts, test lead, senior developer)
Define : Business Analysts
Design : Architects and testers, BAs
Build/implement : developers, testers, BAs
Test : Testers, BAs, developers
Deployment and Maintenance : operational team and production support team