Staff Compiler Performance Engineer

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 roadmapLead design of complex, cross cutting optimizations in the optimizer and code generator, and of the interfaces between the compiler, the runtime and the garbage collectorMake architectural decisions on the Falcon optimization pipeline, compile time budget and tiering strategyLead enablement of Falcon on new hardware platforms and new Azul productsMentor senior engineers, review critical designs and code, and set standards for performance methodology and validationRepresent Azul in the LLVM community: drive upstream design discussions and contributions that benefit managed language compilersMinimum Requirements
8+ years of professional experience developing optimizing compilers or JIT compilersTrack record of technical leadership: owning the design of major compiler components or optimization frameworks used in productionExpert C++ skills and experience in large, long lived codebasesDeep expertise in compiler optimization and code generation, with a clear view of the tradeoffs between peak performance, compile time, warmup and code sizeExpert performance analysis skills down to the microarchitecture levelNice to Have
Recognized contributions to LLVM or another major compiler: code owner, maintainer or author of significant upstream workDeep experience with JIT compilers for managed languages: HotSpot C2, Graal, V8, .NET RyuJIT or similarExperience working closely with runtime and GC teams on speculation, deoptimization and barrier designWhat We Offer
Opportunity to make a high impact at a growing, global companyWork alongside top experts worldwide contributing to the Java ecosystemReferral Program — help us grow with great peoplePremium IT equipment — MacBook Pro or hardware of your choice5 weeks of holidays + 5 sick daysFlexible working hoursPrague / Limassol / Belgrade city center offices OR hybrid/full-remote - UP TO YOUCompetitive compensationWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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