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Software Engineer - Programming Languages

United Kingdom, London · Job Posted March 03, 2026
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Job Description

The Hack team is a group of programming language and type system experts who are responsible for evolving the Hack language (hacklang.org), its developer experience, and Meta's large codebase of Hack code. Our mission is to “make Meta engineers the most productive in the world through safe and expressive languages that work at Meta’s scale”, and because we own the full stack, we can innovate in ways and at speeds that set us apart.

Job Responsibility

  • Improve language’s syntax and semantics to be more expressive and safer for our users
  • Integrate AI into our developer workflows
  • Build richer static analysis to find and fix issues that Meta engineers experience
  • And, doing all of the above at a mind-bogglingly large scale: we operate on a codebase with 100s of millions of lines of code

Requirements

  • Bachelor’s degree in Computer Science, Engineering, or a related technical field (or equivalent practical experience)
  • Academic background in programming languages and type system theory
  • Industry experience as an applied scientist, engineer or similar role, studying and developing programming languages
  • Experience in bringing research results into production
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