Software Marketplace App & Panel

I need a complete software-selling solution that includes:

• An Android application where end-users can browse listed software products, add them to a cart, and securely buy or book them just like any other digital service.
• A web-based admin panel that lets me upload new software builds, set prices, generate or paste licence keys, track orders, and see real-time sales analytics.
• Seamless fulfilment after checkout: once payment clears, the buyer should automatically receive either a direct download link or an activation/licence key inside the app and by email.
• Deployment and hosting on the domain of my choice, with the codebase configured for smooth updates.

Essential flows I expect: user registration/login, searchable product catalogue, multiple payment gateways, order history, and an alert system for failed or refunded transactions. Admin controls must be role-based so additional staff can manage listings without touching sensitive settings.

I’m comfortable with modern stacks—Flutter or native Android on the mobile side, and something like Laravel, Node/React, or Django for the panel—but I’m open if you can justify another approach. Clean UI/UX, well-documented APIs, and straightforward installation scripts will be part of the acceptance criteria.

Show me similar marketplace or digital-delivery projects you’ve completed, outline your proposed tech stack, and include an estimated timeline for MVP plus deployment.