Job Finder Application

This is a simple job finder Spring Boot application, containing three different tasks:

Companies can order jobs
Each job contains one or more shifts
Talents (workers) can be booked for shifts

Product boundary conditions

A job should have at least one shift
The start date of a job cannot be in the past
The end date of a job should be after the start date
A shift's length should equal to 8 hours

Out of scope

In order to keep the scope reasonably sized, there is no possibility for a company to request jobs for specific times.

Objective

Your job is to modify the existing service so it satisfies the following requirements:

Task A

AS a company
I CAN cancel a job I ordered previously
AND if the job gets cancelled all of its shifts get cancelled as well

Task B

AS a company
I CAN cancel a single shift of a job I ordered previously

Task C

AS a company
I CAN cancel all of my shifts which were booked for a specific talent
AND replacement shifts are created with the same dates