Job hunting itself, meaning attending interviews and meeting potential employers, is tolerated in many countries as a legitimate visitor activity, but the ground gets slippery fast. Immigration officers care about intent: if you arrive on a tourist visa and evidence suggests you always planned to take up work, some countries treat that as misrepresentation, which can taint future applications. Anything beyond searching, such as work trials or paid tasks before authorization, crosses into clear violation territory.
Practically, the bigger risk is often at the border rather than during the stay. Arriving with a folder of CVs, interview confirmations, or a one-way ticket can trigger hard questioning, and officers have wide discretion to refuse entry.
A few countries offer dedicated job-seeker visas that make the whole exercise legal and unhurried, which is worth checking before you travel. If you do interview as a tourist, be truthful if asked, avoid any work before your status changes, and plan for the possibility of leaving to convert your visa.