React Redux web app - Bug fixes and development of new features -- 2

We have an existing React Redux web app and looking for a senior talent to take over work on the app. The app consist of a backend which fetch statistics from a remote API, stores it in a database and prepares it using simple calculations (sum). This is then presented in a password protected web app slider. Not looking for juniors, the whole point is to improve the code base from junior.

The kind of work needed:
- 1-2 known smaller urgent issues
- 2-4 known smaller non-urgent issues
- Production of new functionality

Workflow example:
- Initial investigation, for example 2 hours
- Estimation after investigation: 12 hours
- Fixed price: 12 hours
- Repeat for next task

Regards