Technical EngineerThe good thingsThey will teach from below like inspector's works, lab works, till you familiar and understand behind those works. Such as incoming materials, in process till end products. Basically, they make sure you understand what your job is, even related to your subordinate works. Formulation, verify/correct work order, do/update trial test or informations, deal with sales to prepare sample, involve with production and much more.
The challengesTechnical service department has very high expectations and stringent requirements from superior. Stress is unbearable. You need to "shape" yourself according to their "ways" that may not comply with your abilities, and push you to the limit. Yet, you will learn a lot of things in very hard ways.