The author reflects on his journey in the tech industry, starting from designing simple websites in the 90s to becoming a User Experience Designer. He observes how the internet evolved from static pages to interactive platforms, leading to the emergence of webshops and social media. His work shifted from aesthetic design to workforce optimization and then to focusing on user experience, encompassing comprehension and behavior. The industry's reliance on metrics, such as Google Analytics, began to track user behavior in detail, prioritizing conversion optimization over aesthetics. This calculative logic extended to monitoring tech workers' productivity through frameworks like Agile, with success defined by performance metrics. The author highlights a crucial shift where metrics, initially used to measure products and workers, began to govern users themselves, becoming embedded within apps and wearables. He discusses the downside of measurement, noting that what can be quantified gains authority, eclipsing unmeasurable aspects of human experience. The author personally illustrates this through his Fitbit experience, where the app's sleep score began to override his own perception of how rested he felt. He argues that users, workers, and drivers now understand and govern themselves through these algorithmically defined metrics, becoming what he terms "homo metricus." This transformation fundamentally alters how individuals perceive themselves and their actions, often prioritizing measurable output over other valuable contributions or personal experiences.