This is the 17426th most frequent Korean word.
설계해
"설계해" means "design" or "plan."
Here, '설계해' is used to instruct someone to design something, indicating an imperative mood.
새로운 건축 프로젝트를 설계해.
Design the new architectural project.
'설계해' in this context refers metaphorically to planning or outlining one's future or ambitions.
그녀는 미래를 신중히 설계해 나가고 있어.
She is carefully planning her future.
In this sentence, '설계해' is in the context of past experience, accompanying '본 적이 없어', indicating that the speaker has never engaged in the activity of designing the system.