I have worked with employee engagement app for applying leave to approval leave by managers.
Customized dashboard for employees and managers.
For applying leave, we have customized calendar that user can't apply leave after 60 days or for holidays.
Leave history with available leaves and applied leaves status.
Holiday calendar,
Similarly, travel request and approval,
Employee's detailed profile,
Searching employees,
Pin authentication on subsequent use of app after successful employee login.
Can share screenshots as well.