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.

Analyze performance of Java benchmarks and customer workloads, find gaps in generated code and trace them to their root cause in the compiler Implement and improve optimizations in Falcon's middle end and back end: inlining, loop optimizations, vectorization, redundancy elimination, speculative optimizations and their interaction with the runtime Improve code generation for x86_64 and AArch64 Write tests and benchmarks that prove the improvement and protect it from regressions Contribute changes upstream to LLVM where it makes sense

2+ years of professional experience in compilers, JIT compilers or low level performance engineering Strong C++ design and coding skills Solid understanding of compiler optimization theory: SSA, data flow analysis, loop transformations Ability to read assembly and reason about why one instruction sequence is faster than another

Experience with LLVM IR and LLVM optimization passes, or with another optimizing compiler such as HotSpot C2, Graal, GCC or V8 Experience with profilers such as perf, VTune or async profiler Knowledge of x86_64 and/or AArch64 microarchitecture Experience with Java, Scala or Kotlin, or with JVM internals MSc or PhD in Computer Science with a compiler or performance focus

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