An SDE is responsible for modifying software according to client requirements and optimizing applications for better performance. The document outlines the skills, strengths, weaknesses, opportunities, and threats for an SDE. It lists important skills like knowledge of data structures and algorithms, programming proficiency in languages like C++, and analytical thinking. Strengths include being a good listener, having strong logical thinking, and being a good team member. Weaknesses consist of communication skills, programming skills in some languages, and English fluency. Opportunities involve obtaining a degree from a renowned university and taking skill development courses. Threats are competition and distractions unrelated to work.