For now, there is only a limited choice of 2 job opportunities in Madrid. Maybe, you could try slightly farther afield. Backend Development and Java EE are the main categories within this area. The most mentioned skills for these jobs are Jpa, iBATIS, and Primefaces. Are you familiar with them?
Positions that require a lot of EclipseLink experience are at present the most common ones on offer. Among the companies who look for EclipseLink employees, there are currently no startups. Use the Explore search bar to learn about jobs in other areas or locations.