MyStuffRepository.java

public interface MyStuffEntity {
 EntityType getEntityType();
}

public class MyStuff {
 MyStuffEntity savedJobPostings;
 MyStuffEntity appliedJobPostings;
}

Observable<MyStuff> myStuffRepository = Observable
   .merge(savedJobPostingRepository, appliedJobPostingRepository)
   .reduce(new MyStuff(), (accumulated, item) -> {
     switch (item.getEntityType()) {
       case SavedJobs:
         accumulated.savedJobPostings = item;
         break;
       case AppliedJobs:
         accumulated.appliedJobPostings = item;
         break;
     }
     return accumulated;
   });