The fundamental business purpose of engineering is not the act of writing code, but applying technical skills to achieve concrete financial outcomes. All engineering work ultimately serves one of these two goals: increasing revenue or reducing costs.

When hiring senior engineers, the crucial test is whether they can build. This means assessing their ability to take a real-world business problem—like designing a warehouse system—and translate it into a tangible technical solution. This skill separates true builders from theoretical programmers.

Employees attached to solutions are rigid during platform shifts. Those who love problems are adaptable and create lasting value. While they look the same in stable times, periods of change reveal their true nature.

When hiring senior technical talent, the most valuable skill isn't just coding proficiency but the ability to take an abstract business problem—like designing a logistics system—and translate it into a functional technical solution. This skill demonstrates a deeper understanding that connects work to real-world value.

A successful startup CTO cannot remain solely a technologist. They must shift their mindset to deeply understand customer problems to ensure product value. Simultaneously, they must foster an environment where engineers find purpose and innovate, preventing them from becoming mere ticket-takers.

With AI agents automating raw code generation, an engineer's role is evolving beyond pure implementation. To stay valuable, engineers must now cultivate a deep understanding of business context and product taste to know *what* to build and *why*, not just *how*.

A critical career inflection point is moving from solely executing tasks (writing code) to influencing strategic decisions about what problems to solve. True value and impact come from being in the room where decisions are made, not just being the person who implements them.

The pivot from a pure technology role (like CTO) to product leadership is driven by a passion shift. It's moving from being obsessed with technical optimization (e.g., reducing server costs) to being obsessed with customer problems. The reward becomes seeing a customer's delight in a solved problem, which fuels a desire to focus entirely on that part of the business.

The very best engineers optimize for their most precious asset: their time. They are less motivated by competing salary offers and more by the quality of the team, the problem they're solving, and the agency to build something meaningful without becoming a "cog" in a machine.