What Does It Take to Be a Senior Software Engineer/Developer? | HackerNoon
Briefly

Many developers mistakenly believe that years of experience alone dictate seniority. In reality, it's about the depth of experience, expertise, and the impact made through problem-solving.
Senior engineers must possess T-shaped knowledge, balancing a broad understanding of software development with deep expertise in a specific area, allowing them to contribute effectively and provide specialized insights.
Writing efficient, scalable, and maintainable code is crucial for senior software engineers. It requires balancing current requirements with future flexibility and performance without unnecessary optimization.
Seeing the bigger picture is essential. A senior engineer must understand how their work aligns with business goals and how it impacts the overall software development process.
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