If you are spouse of L1 (L1A for 7 years and L1B for 5 years) visa holder, you can apply for employment authorization and when received, you can work for any employer. It is renewable and valid as long as L1 visa is valid.
For application, you will need copy of L1 visa, marriage certificate and I-94 which you need to ask while entering border specifically ( Canadian entering US as tourist for short period do not not need I-94)
If you are not L visa holder but have profession with specified NAFTA schedule, you may try
TN visa which you can just get at the border by showing employment offer. It is valid for one year and renewable indefinitely.