Practical choices.
WHAT DETERMINES EMPLOYABILITY
Demand in your market Depth, rather than a list of languages Demonstrable work
WHAT TO RESEARCH
Job advertisements in your market, and what they actually ask for.
WHY
It shows demand, rather than what is discussed online.
WHAT IS BROADLY IN DEMAND
JavaScript and TypeScript, for anything web Python, for data, automation and backends PHP, for a very large proportion of existing web work Java and C# in larger organisations SQL, universally
WHY SQL IS ON THAT LIST
Almost every role involving data requires it, and it is frequently neglected.
WHAT TO ADD DEPENDING ON DIRECTION
Kotlin or Swift, for mobile Go or Rust, for infrastructure R, for statistical work
WHAT MATTERS MORE THAN THE LIST
Being genuinely good at one, and competent with the surrounding tooling.
WHY
Employers hire for capability, not for a list.
WHAT TO PAIR ANY LANGUAGE WITH
Version control Testing Databases How deployment works