Snap it. It files itself.
Anyone you add here gets told, and their bell only shows alerts for the jobs they are actually on.
This creates the award record you will invoice against. Enter the contractor's document number if you have it.
It installs straight from the web — no app store, no download, and it updates itself. Once installed it opens in its own window — the app itself opens without a connection (cloud sync and first-time Excel export need one) — and behaves like any other app on your machine or phone.
A sole proprietor's SIN is personal information. It is stored apart from the rest of this record, only an owner, admin or accounting user can read it, it shows as the last four digits everywhere else, and every time someone reveals it that is written to the audit trail.
If construction is your main business, CRA wants a T5018 for every Canadian-resident subcontractor you paid more than $500 for construction services in the year — the $500 is measured excluding GST/HST, while the amount reported includes it. Filed within six months of your year end. What you record here is what makes that list possible.