Senior Compiler Performance Engineer

Azul

. Set the technical direction for Falcon performance .

Posted 10/12/2026full-timePrague • CzechiaSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in compiler optimization, including performance analysis and code generation for x86_64 and AArch64 architectures. Proven ability to lead technical direction and mentor teams in delivering impactful compiler improvements.

Highest-signal resume keywords

Compiler Optimization TheoryC++ Design And CodingLLVM Optimization PassesPerformance Analysis SkillsJIT Compiler Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Compiler OptimizationC++ ProgrammingPerformance AnalysisCode GenerationInlining HeuristicsLoop OptimizationsVectorizationEscape AnalysisGC Barrier OptimizationRuntime Call Optimization

Soft Skills

MentoringTechnical LeadershipCollaboration

Tools & Technologies

LLVMHotSpot C2GraalV8.NET RyuJIT

Certifications & Qualifications

PhD In Computer Science

Industry Keywords

X86_64 MicroarchitectureAArch64 MicroarchitectureJVM InternalsGarbage CollectionDeoptimization

Tech Stack

Tools & technologies

AssemblyC++.NET

About the role

Key responsibilities & impact

Set the technical direction for Falcon performance
Own performance of Falcon for a set of workloads or an optimization area end to end: analysis, design, implementation, validation
Design and implement new optimizations and improve existing ones in the middle end and back end, including inlining heuristics, loop optimizations, vectorization, escape analysis, speculation and deoptimization, GC barrier and runtime call optimization
Drive code generation quality on x86_64 and AArch64, including bringing Falcon to new hardware platforms
Investigate complex performance issues reported by customers and turn findings into compiler improvements
Review code, mentor engineers on the team and raise the bar for performance methodology
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

5+ years of professional experience developing optimizing compilers or JIT compilers
Strong C++ design and coding skills in large codebases
Proven track record of delivering compiler optimizations with measurable performance impact
Deep knowledge of compiler optimization theory and its practical tradeoffs: compile time, code size, correctness
Strong performance analysis skills: profilers, hardware counters, reading and reasoning about generated assembly
Significant experience with LLVM optimization passes or code generation; LLVM commit access is a plus
Experience with JIT compilers for managed languages: HotSpot C2, Graal, V8, .NET RyuJIT or similar
Deep knowledge of x86_64 and/or AArch64 microarchitecture
Experience with JVM internals: garbage collection, deoptimization, profiling
PhD in Computer Science or significant research experience in compilers

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