1. There is always a risk. You entered on a nonimmigrant business visitor visa. Did you disclose your intent to seek employment when entering? USCIS may find that you entered with the intent to change status, which is not allowed.
2. The new employer must file an H-1B petition in your behalf. This petition must be approved. You can then enter the U.S. on a valid H-1B visa.
You can read more about H-1B visas at http://myattorneyusa.com/work-visas.
Answered on Jan 23rd, 2017 at 3:41 AM