AXLR8 provides many options for this. You can continue to update staff details when required.
The main tools which may be used, in combination or alone, are:
AFB (AXLR8's Application Form Builder)
AXLR8 Vetting Module (which is for managing your BS7858 compliance) and
the AXLR8 Staff app (also available as a web portal).
Following selection, you may send staff to a secondary form built using AFB . This may ask for details for payroll and the completion of the form may be set up for the applicant a condition of employment. It is sometimes called the "Job Offer Acceptance" form and may contain the job contract and one or more acceptance confirmations. It may contain requests for bank details and other information you fee inappropriate at an earlier stage in the candidate journey. In regulated industries such as Care sector, Security, Air side staffing, your Vetting procedures may also be carrying on for a period using a standard such as BS7858.
If some details were not collected during the selection process, the staff member may also add them through the app or staff portal. These details may include payroll details, bank account details, date of birth, rights to work information. It may be that your business needs to see originals of documents as part of your process and, in that case, the HR team can upload scans/pictures of them and sign them off online.