Technical proficiency
Check fluency in their primary stack: languages, frameworks, ORM or query patterns, Git branching, CI pipelines. Ask them to walk through a class or module they wrote recently.
Evidence to listen for
- Command of the languages, frameworks, and data tools the role actually uses
- Understands correctness, performance, and failure modes, not just syntax
- Has opinions on testing and can justify them
- Reads and reasons about code they did not write
Five-point scoring guide
Cannot work independently; fundamentals are missing.
Weak fundamentals; output needs heavy review.
Competent for the role; needs guidance on complex or unfamiliar work.
Strong practitioner; handles hard problems with little guidance.
Names specific libraries and versions, explains their own code line by line, and admits where they leaned on documentation or teammates.