Hi @Sherif123 ,
Do you want to create a recruitment request in the app and wait for management approval?
I agree with what @AJ_Z said, approval flow is very suitable for your needs, you can create a request through the App, and then create an approval through Flow.
Here are my thoughts:
1. Create a pending record through the App and set the current user as the applicant.
2. Create approvals and update records through the Flow.
I have made a test for your reference.
1. Here is my SharePoint list.


2. Create a App.
3. Add a Gallery Control to Screen and set its items property to recruitrequest.
4. Add an Icon Control and apply the following formula on its OnSelect property as:
NewForm(Form1);Navigate(Screen4)

5. Add a Form to a new Screen and set its DataSource property to recruitrequest.
6. Select the ComboBox Control in ‘applicant_DataCard’ and apply the following formula on its DefaultSelectedItems property as:
Choices(recruitrequest.applicant,Office365Users.MyProfileV2().displayName)

7.Add an Icon control and apply the following formula on its OnSelect property as:
SubmitForm(Form1);Back()
8.Create a Flow.


Result Screenshots:



Best Regards,
Charlie Choi