What is Transferable skills
Skills that carry over between technologies. Transfers run fast within a discipline and slow across disciplines.
In plain terms
A backend developer moving between similar languages, or a frontend developer moving between frameworks in the same ecosystem, typically ramps in weeks. A move across disciplines, such as frontend to machine learning, takes months or years and is a genuine gap. This distinction is the practical basis for deciding when a missed requirement is still submittable.
What it tells you about a developer
A history of successful transfers, visible as new stacks appearing and reaching real output quickly, signals learning speed. Many teams weight that above any single listed skill.
Related
Read the lesson on Transferable skills More in What the tech words mean