Modern software architect, standing in front of a large whiteboard, holding a marker, explaining design patterns, wearing glasses, black suit, white shirt, no tie, confident facial expression, clean-shaven, short brown hair, minimal makeup, subtle lighting, blurred background with code snippets and diagrams, wooden desk with laptop and papers, ergonomic chair, floor-to-ceiling windows with cityscape view, bright daytime, shallow depth of field, warm color tone, soft focus on the architect.