What is Tech stack
The specific set of languages, frameworks, databases, and hosting tools a company uses to build its product.
In plain terms
A stack description like 'TypeScript, Next.js, Postgres on AWS' names the language, the web framework, the database, and the cloud in one line. Job descriptions often compress their requirements into a stack. Candidates rarely need to match every layer of one to succeed in the role.
What it tells you about a developer
A full-stack match is a convenience. Core-language match plus evidence of learning speed predicts success better. Weight the language and the discipline, and treat the rest of the stack as learnable.
Related
Read the lesson on Tech stack More in What the tech words mean