Compiler Performance Engineer

Azul

. Analyze performance of Java benchmarks and customer workloads, find gaps in generated code and trace them to their root cause in the compiler .

Posted 10/12/2026full-timePrague • CzechiaJuniorMid-LevelWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in compiler optimization, performance engineering, and low-level code generation, with a strong focus on C++ and LLVM. Capable of leading design efforts for significant performance improvements while collaborating with cross-functional teams.

Highest-signal resume keywords

C++ Design And Coding SkillsCompiler Optimization TheoryLLVM IR And Optimization PassesPerformance EngineeringAssembly Language Proficiency

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Compiler OptimizationCode GenerationPerformance AnalysisLoop TransformationsData Flow AnalysisInliningVectorizationRedundancy EliminationSpeculative OptimizationsJIT Compilers

Soft Skills

Technical LeadershipCollaborationProblem Solving

Tools & Technologies

LLVMPerfVTuneAsync ProfilerHotSpot C2GraalGCCV8

Certifications & Qualifications

MSc In Computer SciencePhD In Computer Science

Industry Keywords

X86_64 MicroarchitectureAArch64 MicroarchitectureJVM InternalsPerformance GainsCompiler Architecture

Tech Stack

Tools & technologies

AssemblyJavaKotlinScalaC++

About the role

Key responsibilities & impact

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
Set the technical direction for Falcon performance
Decide where the next significant performance gains come from
Lead the design of optimizations that deliver significant performance gains
Ensure the compiler architecture supports the product roadmap
Serve as the senior technical voice on a distributed team of compiler experts
Partner with runtime, GC and product teams

Requirements

What you’ll need

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

Benefits

Comp & perks

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