As we discussed in chat, you are a university student who does part time work for a US employer. Should that employer wish to bring you to the US to work for it for a short period, paid or unpaid, you would need a work visa and the company would need to file a petition for a non-immigrant worker on your behalf. As you realized, this is not quite the right fit for undergraduates, nor would it be a good idea to try to obtain a J-1 visa just to enter the US and work at your part-time employer.
Better, I would encourage you to continue to explore the J-1 Exchange Visitor Program (EVP) independent of any connection with that company.
The Exchange Visitor (J) non-immigrant visa category is for individuals approved to participate in work-and study-based exchange visitor programs.
The EVP provides opportunities for around 300,000 foreign visitors per year to experience United States (U.S.) society and culture and engage with Americans. There are fifteen different categories under the J-1 visa program, of which, thirteen categories include privately-funded programs that are implemented under the auspices of the Office of Private Sector Exchange in the Department’s Bureau of Educational and Cultural Affairs. The Department designates more than 1,400 for-profit, non-profit, or federal, state, and local government entities to conduct such private sector programs.
Exchange visitors on private sector programs may study, teach, do research, share their specialized skills, or receive on-the-job training for periods ranging from a few weeks to several years. In addition to the thirteen private sector exchange categories listed below, the J-1 visa program also includes two categories that are publicly funded: International Visitors and Government Visitors.
Who Comes on the EVP?
EVP participants are young leaders and entrepreneurs, students, fledgling and more seasoned professionals eager to hone their skills, strengthen their English language abilities, connect with Americans, and learn more about the U.S.
EVP requires sponsorship and the Designated Sponsors are organizations throughout the US. Many sponsors can place participants anywhere in the United States, regardless of their official location.