It’s not that unusual of a situation. You might have other technical teams but your lead developer(s) leave. These days you can outsource technical tests to on

It’s not that unusual of a situation. You might have other technical teams but your lead developer(s) leave. These days you can outsource technical tests to online businesses that specialise in that kind of stuff but that wasn’t always an option, particularly if you travel far back enough in time, and hiring contractors to support you during the recruitment process is often seen as too expensive for some businesses.