The Boston-headquartered Fidelity Investments initially hired 350 employees in Albuquerque when it opened in 2008. It has since ramped up its staff and service offerings in recent years. Fidelity announced Thursday it would hire an additional 250 employees in the coming months. It’s also hired 200 new people since July of 2015, and last year spent $2.5 million to remodel its Mesa Del Sol offices at 5401 Watson Drive SE. The expansion will allow the company to eventually fit 1,250 people there. David…