design an employee swap in swap out system

The system will have a machine which records the swap in and swap out. The user can also login in a portal where he can check his swap in /swap out time. He can correct his time also. Employee can see records for specific period(1week, 1month, 1 year). There will be managers for employee who can check the entry for all the employees which are under them and correct their subordinates timings also There will be HR who can only view the entries for all the employees. We have to come up with the HLD and LLD for the system.