是的, 1月23日开始. The price of mail stamps in the United States will rise by 3 cent on Jan. 23 , the largest rate increase in 11 years. The increase to 49 cents will be in effect for two years, The Postal Regulatory Commission, which oversees the US Postal Service, announced Tuesday.
Depends on your job description. Backend developer usually do not have to work with frontend javascript, that's frontend developer's job. But in a small company, you may have to do both.