This is coming from my experience working with mostly non-technical founders who are trying to turn their idea into a working product and start getting traction

This is coming from my experience working with mostly non-technical founders who are trying to turn their idea into a working product and start getting traction in the market: What makes for a world-class software engineer is the ability to consistently deliver business value. Learn about your company's market & business strategy. Be reliable. Effectively communicate with the non-technical stakeholders and be the bridge between technology and business goals. Make sure they're aware of pros and cons of every development related decision. Get used to saying no and pushing back on some of their ideas. Don't write code to solve problems that can be solved by an excel spreadsheet. Your main goal is to build a successful business, writing clean code and using cool tech comes in secondary.