React developer - full stack, expert level

We are looking for an immediate start for the following

Maintenance and immediate bug/crash fixing for our software platform on a monthly fixed fee agreement:
The software has only recently been developed by a highly capable supplier and is bug free. Maintenance involves:

Code audit - Checking if there are any updates or security hazards for packages used in the software.
Text changes - Adjustments to existing text
Bug fixes - Existing features that used to work but do not work any more
Crash - A situation whereby the questionnaire is unusable.

Further development of the software on a project by project basis.

Developer requirements

The Developer should be full stack with expert level in React, knowing how to use the container design pattern is essential along with PureComponents, lifecycle methods, decorators, higher order components. Expert level of Redux is required in combination with Reselect. Experience writing useful tests in jest is of the upmost importance for components and selectors. An understanding of NoSQL data structures is required and firebase experience is preferred. An understanding of Sockets is a bonus. They should be fully comfortable working in node and deploying applications to the Heroku platform.
At least 5 years experience developing and 2 years working with react, with at least 1 react app in production.

Please respond with an overview of your skills match, a current CV and contact details.