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Compiler Engineer

Jane Street· Technology
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LondonPosted 3mo ago

About the role

Software engineer to work on code generation in the OxCaml compiler (Jane Street’s OCaml variant) focused on high-performance and parallel programming with data race freedom. Full lifecycle involvement from identifying optimisations to deployment across various intermediate representations.

Responsibilities

  • Identify new optimisations for code generation in OxCaml
  • Write, test, benchmark and deploy changes
  • Work across intermediate representations (CPS, SSA, and possibly Sea of Nodes)
  • Collaborate with multiple groups across Jane Street worldwide
  • Engage in interaction with teams and individuals across the company

Qualifications

  • Experience as a software engineer in compiler/toolchain environments
  • Proven ability to manage a team of developers (preferred)
  • Fluency in English (required)
  • Willingness to use AI assistance to accelerate production changes
  • Experience with debuggers (e.g., lldb, gdb) and low-level Linux tools
  • Knowledge of x86-64 and AArch64 architectures at assembly and architectural level (plus)
  • Experience with any compiler toolchain; LLVM knowledge useful
  • No requirement for prior OCaml/OxCaml language knowledge (teaching available)

Skills

Required:Compiler developmentEnglish communication
Nice to have:Debugging and low-level systemsTeam leadership/management
Last updated Oct 25, 2026. Interested? Apply on the company site.

About Jane Street

SIX

Jane Street is a quantitative trading firm and liquidity provider with a unique focus on technology and collaborative problem solving.

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