Multinationals are the classic gateway for expat careers because they already have the legal machinery and habit of moving people across borders. The sectors that sponsor most readily are consistent worldwide: technology and software, consulting and professional services, banking and finance, pharmaceuticals and healthcare, engineering and energy, and international schools and universities. Within those, the biggest global firms process visas routinely, and their career sites often let you filter roles by country and note sponsorship availability.
Identifying relocation-friendly employers takes a bit of detective work that pays off. Signals to look for: job ads that mention visa sponsorship or relocation support explicitly, companies appearing repeatedly in government-published sponsor registers, which several countries make public, employers with visibly international teams on LinkedIn, and firms hiring in shortage occupations where governments smooth the visa path, like healthcare, engineering and IT in many countries. Expat forums and professional communities in your field will also name names freely when asked which companies sponsor.
Two strategic angles worth considering: joining a multinational in your home country first and pursuing an internal transfer later is often the smoothest route of all, since intra-company transfer visas exist in most countries; and smaller firms in acute shortage sectors sometimes sponsor more eagerly than famous names drowning in applicants.