Ego, from the Latin "I", is the psychological structure that organises our self-perception, consciousness, and identity. It acts as a mediator between instincts and morality, helping us interpret reality. Although necessary for self-esteem, an unchecked ego can distort reality and generate defensive behaviour. From a software development perspective — or when building a professional career — it is vital to understand the processes we must master to call ourselves experts in a subject. However, when beyond expertise we begin to undervalue areas outside our profession, we fall into a common mistake: believing those areas are not important, because only what we do counts and matters. I do not judge you — it happened to me. It cost me jobs, arguments, and a closed-mindedness that showed in many ways. Only years of experience made me realise that my ignorance was not only bold, but downright loud.…