Australian architect and engineering firms should prioritize e-signature solutions that comply with the Electronic Transactions Act 1999 (Cth) and ensure legal enforceability for contracts and technical documents. Key factors include integration with design software like AutoCAD or Revit, robust audit trails for regulatory compliance, data sovereignty within Australia, and support for multi-party workflows to handle approvals from clients, contractors, and regulators. Solutions that offer scalable pricing and mobile accessibility are also essential for field-based operations.