Xi'an Jiaotong University is the reason to look at Xi'an for engineering: energy and power engineering, electrical engineering, mechanical engineering and management are all top-tier, and the university has a long record of hosting international postgraduate students. The city is also the higher-education centre of the northwest, so the ecosystem around it includes several large universities we do not cover individually.
The industry map is narrower than the coast but unusually deep in two areas: aerospace and defence research, and power equipment manufacturing. Add the historical layer — the city was the Tang capital and the archaeology is not a theme park — and you have a place that is genuinely different from Shanghai rather than a cheaper version of it.