What kind of visa can I apply for to work for my relative who holds an EB-5 visa?

Yes, depending on the type of job offered (i.e., professional level vs. unskilled), there are various visa options here. The EB-5 business can petition for you to work in a professional capacity under either H-1B or an E visa (depending on if a treaty exists between your home country and U.S.).

He cannot directly sponsor you as a family member, and sponsoring you as a business owner comes with its own problems. But by talking to an immigration attorney will help you with all of your options.

You may consider an H-1B specialty occupation if the business requires one or other ways to immigrate, such as PERM/I-140, EB-2 or EB-3 based on qualifications. Consult an experienced immigration attorney to discuss all possible options.

Yes, he can hire you. Also, there are various options on the types of visas you can qualify for, depending on your educational background and experience. Advisably, consult an immigration attorney for guidance.

Depending on country of origin and your qualifications, Es may be an option. Perhaps even L if a foreign company exists. H1s and EB-2/3 are problematic for relatives.

A U.S. employer can sponsor you for an H-1B or for permanent residency through permanent employment certification (PERM). The fact that the sponsoring company is owned by your uncle could be a negative factor, but not necessarily a determining factor. You are correct that only his immediate family can qualify for permanent residency as his dependents through an EB-5 investment.

Depends on your education and work experience.

If there is a legitimate good faith specialty occupation job offer, you might be able to apply for an H-1B. If you are truly extraordinary, you can possibly even get an O-1, but that is a very high standard. Prepare your resume and provide details of the job offer to qualified immigration law specialists and they can advise you on a variety of work visa options.

There are limited options to work for a relative in the U.S.

There are several work-related visas, but it will depend on your background, the job and his business. Having a family member be sponsored by a business is always suspect and will face much more scrutiny by the government. The fact that his EB-5 business is a new, unproven entity also will negative impact any sponsorship. Also, your job cannot be counted as one of the 10 jobs that your uncle must create under EB-5.