Compiler Engineer

Posted Yesterday
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London, Greater London, England, GBR
In-Office
Senior level
Financial Services
The Role
Design and implement code-generation optimizations for the OxCaml compiler. Own the full cycle: identify optimizations, code, test, benchmark, and deploy across IRs (CPS, SSA, Sea of Nodes). Collaborate with cross-functional teams and may manage developers alongside technical work.
Summary Generated by Built In
About the Position

We are looking for an experienced software engineer to work on code generation in the OxCaml compiler, which is open source. OxCaml is Jane Street’s variant of the OCaml language, equipped with powerful features for high-performance and parallel programming, with data race freedom guarantees.

This role involves the full cycle of identifying new optimisations, coding, testing, benchmarking and deployment. There will be the opportunity to work across a wide variety of intermediate representations, including CPS, SSA and maybe even Sea of Nodes. This role will also allow you to interact with many different groups and exceptional individuals across Jane Street worldwide.

About You

The ideal candidate will be super productive: fast at writing correct code, willing to use AI assistance to get changes to production faster and experienced with debuggers (e.g., lldb, gdb) and low-level Linux tools. Having knowledge of x86-64 and AArch64 architectures at the assembly language and architectural level is a plus.

We are happy to consider candidates with experience on any compiler toolchain, although knowledge of LLVM would be useful. No knowledge of the OCaml or OxCaml languages is required–we can teach you what you need to know.

We are particularly interested in candidates who have proven experience managing a team of developers, and who would enjoy doing that alongside their normal technical work. Fluency in English is required. 

If you're a recruiting agency and want to partner with us, please reach out to [email protected]


Skills Required

  • Experience building and optimizing compiler code generation or compiler toolchains
  • Proficiency with debuggers (lldb, gdb) and low-level Linux tooling
  • Fluency in English
  • Fast at writing correct code and able to deliver production changes quickly (including using AI assistance)
  • Knowledge of x86-64 and AArch64 assembly and architecture
  • Experience with LLVM or other compiler toolchains
  • Proven experience managing a team of developers (ability to manage alongside technical work)
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