Azul is seeking an LLVM Compiler Engineer to work on Falcon, their Just-In-Time compiler for Java bytecode. The role involves developing compiler features, LLVM performance improvements, and open-source contributions within a collaborative team of compiler experts.
- Remote scope
- Prague office with full remote also possible
What you need
- Strong C/C++ design and coding skills
- 5+ years of experience developing LLVM compilers, or transferable experience with another compiler
- Strong background in compiler theory and development
What you will own
- Developing new features and optimizations in the Falcon compiler
- Improving LLVM performance specifically for managed languages
- Contributing to open source projects
- Working collaboratively with a distributed team of compiler experts
Core skillsC/C++LLVMCompiler designJava bytecodeJIT compilationCompiler theoryx86_64ARM64
Remote policyFull remote possible; Prague / Limassol / Belgrade city center offices — hybrid or full-remote also possible
As the only company focused 100% on Java, Azul is building the Java platform for the modern cloud enterprise. We are reimagining how customers use Java, bringing them the tools and insight they need to deliver faster, more performant, more dependable, and less expensive Java services. Come join one of the most influential members of the Java and OpenJDK community and help influence the future of Java.
Falcon is the optimizing just in time (JIT) compiler in Azul Platform Prime. It compiles hot Java bytecode into highly optimized machine code and delivers Java performance that standard JVMs do not reach. Falcon is built on LLVM.
We are looking for a Staff Compiler Performance Engineer to set the technical direction for Falcon performance. This is not a compiler front end role and not a compiler built from scratch: Falcon is mature and runs in production at large enterprises. You will decide where the next significant performance gains come from, lead the design of the optimizations that deliver them, and make sure the compiler architecture supports the product roadmap.
You will be the senior technical voice on a distributed team of compiler experts and a key partner for runtime, GC and product teams.
What You Will Do
Define the performance strategy for Falcon: identify the largest opportunities across benchmarks and customer workloads and turn them into a technical roadmap
Lead design of complex, cross cutting optimizations in the optimizer and code generator, and of the interfaces between the compiler, the runtime and the garbage collector
Make architectural decisions on the Falcon optimization pipeline, compile time budget and tiering strategy
Lead enablement of Falcon on new hardware platforms and new Azul products
Mentor senior engineers, review critical designs and code, and set standards for performance methodology and validation
Represent Azul in the LLVM community: drive upstream design discussions and contributions that benefit managed language compilers
Minimum Requirements
8+ years of professional experience developing optimizing compilers or JIT compilers
Track record of technical leadership: owning the design of major compiler components or optimization frameworks used in production
Expert C++ skills and experience in large, long lived codebases
Deep expertise in compiler optimization and code generation, with a clear view of the tradeoffs between peak performance, compile time, warmup and code size
Expert performance analysis skills down to the microarchitecture level
Nice to Have
Recognized contributions to LLVM or another major compiler: code owner, maintainer or author of significant upstream work
Deep experience with JIT compilers for managed languages: HotSpot C2, Graal, V8, .NET RyuJIT or similar
Experience working closely with runtime and GC teams on speculation, deoptimization and barrier design
What We Offer
Opportunity to make a high impact at a growing, global company
Work alongside top experts worldwide contributing to the Java ecosystem
Referral Program — help us grow with great people
Premium IT equipment — MacBook Pro or hardware of your choice
5 weeks of holidays + 5 sick days
Flexible working hours
Prague / Limassol / Belgrade city center offices OR hybrid/full-remote - UP TO YOU
Competitive compensation
