Hire your first tester when testing has become continuous rather than occasional. In practice that is usually when you release at least weekly, support more than one type of user, and handle money or personal data.
Before that, an outside tester on releases that matter costs less and covers more.
The wrong triggers
Two bad reasons to hire, both common.
Headcount became available. A budget opened, so a role gets filled. The person arrives without a process to join, spends three months inventing one, and is measured against expectations nobody wrote down.
Something bad happened. A launch went wrong, so a tester gets hired in the aftermath. This is understandable and usually still wrong. A hire made in a panic is scoped to the last disaster rather than to the actual risk profile.
The four conditions
Hire when at least three are true.
1. You release weekly or more often.
Release frequency is the best single predictor. At monthly releases, testing is an event you can buy in for. At weekly, it is a rhythm, and buying it in means constant coordination overhead.
2. You have more than one user type.
One user type is one product. Customers, sellers, and administrators is three products sharing a database, and the interesting bugs live where they meet. A customer sees a seller's draft. An admin action does not propagate. These need someone holding the whole model in their head continuously.
3. You handle money or personal data.
Payment and personal data failures are not proportional to their technical size. A one-line permission error is a breach. A currency rounding bug is a refund programme.
4. Your developers are visibly slowing down.
Watch what happens to velocity, not to bug counts. When developers spend more time on maintenance than on features, the fix is not more developers.
What to do before you meet those conditions
Write down what you check before a release. Ten lines is enough. This is the highest-value thing a small team can do about quality, and it costs one afternoon.
Buy testing for the releases that matter. Not every release. The ones where failure is expensive: launches, checkout changes, payment provider migrations, redesigns, anything touching permissions.
At $349 for a single flow, you can cover the risky releases for a year for less than two months of a junior tester's salary. That is not an argument against hiring. It is an argument about sequencing.
Make one person accountable. Not for doing all the testing. For knowing what was tested. Ambiguity is worse than under-resourcing.
What happens if you hire too early
The role has no shape yet. Your new tester spends their first quarter building process instead of finding bugs, which is real work but invisible to everyone waiting for results.
Worse, testing gets treated as solved. Developers stop checking their own work carefully, because someone else does that now. Total quality can drop after the first QA hire, and the drop is disguised as a bedding-in period.
What happens if you hire too late
More common and more expensive.
Your customers have been doing your testing for a year. Your reputation already carries it. The fragile parts of your product are now load-bearing, and nobody remembers how they work.
And your first tester walks into an enormous backlog with no baseline. Their first six months are archaeology.
The honest summary
Most startups should not hire a tester in their first two years. Most should also not go those two years with nobody but the author checking the work.
The gap between those two statements is filled by structured self-testing plus bought-in help on releases that matter. That is a real strategy, not a compromise.
Want an outside view on whether you are ready? Tell us where you are and we will say so plainly.