The last job offer that made me smile was for an AI / fullstack developper. Aka the platypus of software dev. The problem is pretty simple. Let's say you are c

The last job offer that made me smile was for an AI / fullstack developper. Aka the platypus of software dev. The problem is pretty simple. Let's say you are cutting-edge in all the technologies that make you very adaptable at time T. You get hired. You decide a stack A/B/C/... for your next project. You get stuck in that project for ... let's say 3 years. (a reasonable time for a project to reach production and have a few real-life iterations). If you are not an assh... who leaves after 2 years (leaving the production/maintenance to others, i.e never having lived the "hell" of maintaining things for real), then you are 3 years-behind in all the technologies that are not in the A/B/C/... stack. Now, at time T+3, you are ... the obsolete man [for TTZ fans only :)]