Compiler Engineer

JobsCloseBy Editorial Insights

Jane Street is seeking an experienced Compiler Engineer to join the London onsite team, focusing on code generation for OxCaml, the firm’s high-performance OCaml variant with data race freedom. You’ll own the full cycle from identifying optimizations to coding, testing, benchmarking and deployment, and you’ll work across CPS, SSA and possibly Sea of Nodes while collaborating with colleagues worldwide. The ideal candidate is highly productive, writes correct code quickly, embraces AI tools to ship faster, and is comfortable debugging on Linux with LLDB or GDB and with low-level architectures such as x86-64 and AArch64. LLVM knowledge helps; OCaml knowledge is not required, and leadership experience is valued. Fluency in English is required. When applying, showcase production-oriented compiler work, performance gains, and mentoring or team leadership, and be ready to discuss OxCaml concepts.

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. 

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