Compiler Engineer

Compiler Engineer (LLVM/Clang)

Location:

Fully Remote (HQ in France) ⌚

Contract Type:

Freelance Contract - Initial 6 months with extensions Rate:

Up to €500 per day

We are working with a leading consultancy in France that is expanding its LLVM compiler engineering capability. They are looking for an experienced

LLVM/Clang Compiler Engineer

to support customer projects from initial scoping through to technical delivery. This is a hands-on role where you will design, build, and upstream production-grade compiler features particularly within backend/code generation, with a strong preference for RISC-V experience.

They have 2 open positions for this team and the plan is to extend your contract after 6 months and hire more people into your team, effectively making you a team lead.

Responsibilities

Implement and optimize backend components for LLVM targets (instruction selection, register allocation, scheduling, lowering). Extend and maintain Clang front-end and tooling where required (attributes, builtins, diagnostics, driver). Develop and tune middle-end IR passes, including vectorization, loop optimizations, inlining, and PGO/LTO workflows. Add and validate target features such as ISA extensions, relocations, TLS models, and ABI/calling conventions. Profile and optimize real workloads using tools like perf, VTune, and hardware counters. Contribute to LLVM/Clang upstream: RFCs, patches, reviews, and ongoing maintenance. Work closely with customers to understand requirements and provide accurate effort estimates for LLVM-based projects.

Key Skills

Proven professional experience working on LLVM/Clang, especially in backend or code-generation. You must have a a strong ability to speak with customers directly Strong C/C++ systems programming skills and solid understanding of compiler internals (IR, SSA, analysis, passes). Familiarity with computer architecture fundamentals (pipelines, memory models, caches, atomics). Comfortable with Unix toolchains, CMake/Ninja, git, and collaborative code review.

Bonus Points

Experience with RISC-V architectures and extensions is highly preferred. Experience with MLIR, sanitizers, LLD, libc++, PGO/LTO, or embedded/cross-compilation workflows.

If you're excited about contributing to cutting-edge LLVM/Clang development and helping shape customer-facing compiler projects, apply now or contact us for more information

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£250 , with an additional

£250

donated to a charity of your choice. 5V Tech is acting as an Employment Agency for this vacancy. We specialise in talent solutions.