Compliance management system and integrated Lms

I need a professional to develop a compliance management system (professional documents, training certificates with notifications before expiry date, notifications, team/crew control, shift/rotation control, incidents, corrective/preventive actions,  employee folder, procedures, policies, calendar). Integrated with an LMS system, which I  provide online courses for employees, following some unique characteristics due to the type of activity.
The system will be complex, I have all the development map, prototypes, screens etc.
I know exactly what i need. I can precisely direct all steps and development process.
I already have systems running with that works fine, but it is 3rd party (and expensive), however, I would like to integrate all of them into the same system and ready to be replicated (scale) according to my needs.
The development was started by other Devs, who ended up abandoning the project, the database and about 30% of the screens are ready, it is being developed in React.js, I can study some solution in Node.js too, but the result should be a responsive, fast and clean Web App.
My deadline would be 90 days (3 months) to carry out this project. Remembering: It is not necessary to find out what the customer wants, suggest functions and nothing of the sort. It is a complex system, but based entirely on existing and working solutions.

I can demonstrate and point out all the functions I need meeting.