Compiler Performance Engineer

Job summary

Analyze performance of Java benchmarks and customer workloads to identify and fix bottlenecks in the Falcon JIT compiler. Implement and improve optimizations in the compiler's middle and back end while contributing to LLVM.

Job details

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 Compiler Performance Engineer to make Falcon generate even faster code. This is not a compiler front end role and not a compiler built from scratch: the compiler exists, runs in production at large enterprises, and your job is to find where the generated code is slower than it should be and fix it in the optimizer and code generator. You will join a distributed team of compiler experts and work on real workloads with direct, measurable impact on customer performance. \n What You Will Do 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 Minimum Requirements 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 Nice to Have 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 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 \n

What you’ll do

Analyze performance of Java benchmarks and customer workloads to identify and fix bottlenecks in the Falcon JIT compiler. Implement and improve optimizations in the compiler's middle and back end while contributing to LLVM.

Requirements

Requires 2+ years of professional experience in compilers or low-level performance engineering and strong C++ design skills. Candidates must have a solid understanding of compiler optimization theory and the ability to read assembly code.

Benefits

• Referral program
• Premium IT equipment
• 5 weeks of holidays
• 5 sick days
• Flexible working hours

Listed skills

• Java · Preferred
• C++ · Preferred

Other relevant skills

Identified from the job description. Confirm important requirements above.

• C++
• Compiler optimization
• LLVM
• JIT compilers
• Performance engineering
• SSA
• Data flow analysis
• Loop transformations
• Assembly
• x86_64
• AArch64
• Java
• JVM internals
• Profiling
• Vectorization
• Influencing Skills
• Falcon
• Java (Programming Language)
• X86-64
• C++ (Programming Language)
• Compilers
• Code Generation
• Optimizing Compilers
• Computer Science
• Microarchitecture
• Data-Flow Analysis
• Virtual Teams
• Java Bytecode
• Java Virtual Machine (JVM)
• Low Level Virtual Machine (Free Compilers And Interpreters)
• Machine Code
• Performance Engineering
• Vtune
• Scala (Programming Language)
• Front End (Software Engineering)
• Kotlin

Job areas

• Software
• Technology
• Engineering
• Science & Research
• Performance Engineer
• Software Developers

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