Madrid and Barcelona offer the highest number of job opportunities, especially in IT, engineering, finance, banking, and business services. Valencia, Seville, Malaga, and Bilbao are also growing fast due to increasing tourism, construction projects, and renewable energy development. These cities hire a large number of foreign workers each year. Job seekers can find good opportunities across tech companies, startups, international schools, hospitals, and hospitality businesses. Major cities also offer better salaries and career growth.