Administration Support for Micro Consulting Company

We need admin support to provide the following services on an adhoc basis each month (around 2 days per week):
(a) proficient in using Xero to administer internal and external invoices, and running VAT each quarter
(b) proficient in time writing applications such as Clockify and WorkstreamMax to run reports when contractors are near or over budget and also recording time for internal and external clients
(c) using Microsoft apps such as Planner and Teams to support the administration of sales quotes, proposals etc
(d) support the directors with adhoc tasks