Most expats land jobs through a blend of channels rather than one magic portal, and the mix shifts by country. LinkedIn is the backbone almost everywhere for professional roles, both for applications and for being found by recruiters, so a polished profile with your target country in the location field genuinely changes what appears in your feed. Each country then has its own dominant local job boards, which often carry roles that never reach international sites, so ask people already working there which portals employers actually use.
Beyond portals, the highest-yield routes are often less visible: recruitment agencies that specialize in placing foreigners, direct applications to multinationals with offices in your target country, internal transfers if your current employer has a presence there, and referrals from expat and alumni networks, which in many markets beat cold applications by a wide margin. Industry-specific communities, from tech meetups to teaching networks, function as informal job boards too.
One filter to apply constantly: prioritize employers with a track record of sponsoring work visas, since a company that has never sponsored one rarely starts with you. Job ads sometimes state visa sponsorship openly, and expat forums for your industry will name the sponsor-friendly firms.