Discovery & Strategy — Goals, users, tech constraints, and roadmap. Product Design — Research, user flows, wireframes, and high-fidelity prototypes. Engineering Sprint — Agile sprints, continuous integration, and iterative releases. Testing & QA — Unit, integration, and end-to-end testing plus performance checks. Launch & Deployment — App Store & Play Store submissions, cloud rollout, monitoring. Maintain & Improve — Ongoing analytics, A/B testing, and product evolution.