Worked on enhancing authentication security in the workos/authkit-nextjs repository by implementing PKCE Flow Isolation using flow-specific cookies. This approach addressed the issue of cookie clobbering by ensuring each concurrent PKCE authentication flow maintained its own isolated state, thereby reducing the risk of cross-flow state bleed and improving session integrity for end users. The solution was developed collaboratively, with thorough code review and peer input. The work leveraged TypeScript and Node.js, focusing on secure cookie management and multi-flow authentication architecture. This feature strengthened the reliability of multi-session authentication workflows within a full stack development context over the course of one month.