Briefly summarize your current (or most recent) job, including the nature of work, major responsibilities, and where relevant, employees under your supervision, size of budget, clients/products and results achieved. (short answer)
This is fairly straightforward; however I urge you to run this response by people in your life (or ideally, a consultant) who has no familiarity with your job. We are striving for universal language that will be understood by all members of adcom. They don’t get your acronyms or jargon, and it will be a barrier to them appreciating your greatness.
Tell them the level you are working at: this is often indicated by budgets and employees, but if there is some other measure in your industry, share that. The point of an MBA, for employers, is to access a large body of vetted candidates. Here, INSEAD is seeing how VETTED you are already, by your employer.
And of course, don’t forget the results part. While you don’t have to go into long-winded stories here, just give them a bit of context around the resume highlights that are already in STAR format. Bring a bit of life to those, don’t copy paste, of course. Results are best when quantitative and speak to motivations of making money, saving time and saving money.
For many that involves a certain amount of modeling: what would have happened had you not done that IT thing you did? Would it have impacted the amount of money your organization could have made? Would it have jeopardized your organizations ability to make money? Think creatively about how to demonstrate how you added value.