Wayfair Inc. W, -2.37% said Thursday that it will add 450 jobs in Big Flats, New York through a new customer service center. The jobs will be full-time management, customer service and sales positions. The facility is scheduled to open this summer with hiring beginning this month. Wayfair has 7,700 employees around the world including customer service centers in Massachusetts, Maine, Utah and Texas. Wayfair shares are up 85.7% for the past year while the S&P 500 index SPX, -1.38% is up 14.5% for the period.