The exponential growth of distributed software development and remote collaboration has driven the need for efficient, real-time, browser-based programming environments. Collab Dev is a cloud-based collaborative code editor designed to enable multiple users, developers, educators, interviewers, and remote teams to simultaneously write, edit, and execute code within a shared environment. The platform integrates advanced web technologies such as Monaco Editor, Socket.IO, and Clerk Authentication to provide secure, low-latency, real-time code synchronization. It further includes a dynamic file explorer and role-based access control for a development experience comparable to native IDEs. The system adopts a modular architecture with theme customization (light/dark mode) and a responsive UI built using Next.js, Tailwind CSS, and ShadCN UI, ensuring accessibility and seamless usability. By eliminating installation dependencies and supporting browser-based execution, Collab Dev enhances productivity and collaboration efficiency for use cases such as pair programming, technical interviews, coding bootcamps, and remote development sessions. This study presents the design and implementation of Collab Dev, evaluating its effectiveness in bridging the gap between code sharing and real-time collaborative development. The results demonstrate its potential to redefine modern programming workflows by providing an integrated, secure, and interactive web-based IDE for synchronized software development.