Improve Java performance through C++ optimization and code generation with Azul’s Falcon JIT compiler, working remotely or from Prague, Limassol, or Belgrade.
As a Compiler Performance Engineer, you will optimize Falcon, the LLVM-based JIT compiler in Azul Platform Prime. Analyze benchmarks and customer workloads to find generated-code gaps and root causes. Apply compiler optimization theory across Falcon’s middle and back ends.
Key Responsibilities: Analyze Java benchmarks and customer workloads
Trace generated-code gaps to compiler root causes
Implement inlining, loop, vectorization, and redundancy optimizations
Improve x86_64 and AArch64 code generation
Write regression-protecting tests and benchmarks
Requirements: Two-plus years in compilers or low-level performance engineering
Robust C++ design and coding skills
Understanding of SSA, data flow, and loop transformations
Ability to read assembly and compare instruction sequences
LLVM, profiler, JVM, or microarchitecture experience is beneficial
Bring compiler expertise, C++, and performance analysis to make Falcon generate faster Java code for Azul customers.

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📌 Java JIT Compiler Performance Engineer (Ontario)
🏢 Azul
📍 Ontario