Kansas City remains an engineering hub, according to the annual ranking by the trade publication Engineering News-Record. The area’s biggest firms — Black & Veatch at No. 15, Burns & McDonnell at No. 17, and HNTB at No. 20 — each moved up a spot from a year ago on the list, which was based on 2014 revenue. Terracon Consultants checked in at No. 35, the same as a year ago.