Code quality and craft Layer 1 · Core L5 Expert Sets the readability bar for whole projects; refactors toward clarity and keeps public surfaces small.
JavaScript / TypeScript Layer 2 · Tech L5 Expert Designs library APIs with rigorous generic and conditional types; ships type-safe code that other libraries build on.
Testing and quality assurance Layer 1 · Core L5 Expert
Treats tests as a design tool; maintains high-coverage suites and builds testing infrastructure others rely on.
Documentation Layer 1 · Core L4 Proficient
Writes docs that lower the barrier to contribution; READMEs and API references stay current with the code.
Version control and collaboration tooling Layer 1 · Core L4 Proficient Curates clean history, reviews thoroughly, and shepherds external contributions to merge.
System design and architecture Layer 1 · Core L4 Proficient
Designs module boundaries that survive growth; reasons about API stability and backward compatibility.
Debugging and problem decomposition Layer 1 · Core L4 Proficient
Isolates failures methodically and lands fixes with regression tests that pin the bug.
Performance and optimization Layer 1 · Core L4 Proficient
Profiles before optimizing and keeps hot paths measured; avoids speculative micro-tuning.
Operational awareness Layer 1 · Core L3 Competent
Ships CI/CD and release automation; less visible signal on production monitoring and incident response.
Security awareness Layer 1 · Core L3 Competent
Handles dependencies and inputs responsibly; deeper threat-modeling signal would lift this further.
AI-assisted development Layer 1 · Core