Compiler Performance Engineer

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