Mobile app development in Kolkata involves several key stages: planning, design, development, testing, and deployment. During planning, project requirements and target audience are defined. The design phase focuses on user interface and experience. Development includes coding for both frontend and backend. Testing involves functional, performance, and usability checks to ensure quality. Finally, deployment encompasses launching the app on relevant platforms, followed by ongoing maintenance and updates. Kolkata has a growing tech ecosystem, with numerous startups and established companies specializing in mobile app services.