According to the link in your question, you do seem to fit the requirements of a B-1 visa:
If you apply for a B-1/B-2 visa, you must demonstrate to a consular
officer that you qualify for a U.S. visa in accordance with the U.S.
Immigration and Nationality Act (INA). Section 214(b) of the INA
presumes that every B-1/B-2 applicant is an intending immigrant. You
must overcome this legal presumption by showing:
- That the purpose of your trip to the United States is for a
temporary visit, such as business, pleasure, or medical treatment
- That you plan to remain in the United States for a specific, limited
period of time
- Evidence of funds to cover your expenses while in the United States
- That you have a residence outside the United States, as well as
other binding social or economic ties, that will ensure your return
abroad at the end of your visit
You may need a letter from the company that you are interviewing with, stating that they have invited you to their office for a professional matter. You will also (per the second item on the list above) be required to show your return ticket to Russia to prove that your stay in the US is specific and limited.
I suggest talking to whoever scheduled your interview to see if they have experience with international candidates (many companies can help their job candidates figure out what the necessary paperwork is), and keep trying to get in touch with the US embassy near you. It seems pretty clear that B-1 is the type of visa you need, but it's always best to make sure with the US government directly.