Azul Systems

OpenJDK-based Java performance solutions for enterprises

Senior Compiler Performance Engineer

Systems Software EngineeringConfirmed live in the last 24 hours

Full-timeNo salary listedRemote

About the Job

Requirements

At least 5 years of professional experience developing optimizing compilers or just-in-time compilers.
Strong C++ design and coding skills in large codebases.
A proven track record of delivering compiler optimizations with measurable performance impact.
Deep knowledge of compiler optimization theory and its practical tradeoffs, including compile time, code size, and correctness.
Strong performance analysis skills, including use of profilers and hardware counters and the ability to read and reason about generated assembly.

Responsibilities

Own performance of Falcon for a set of workloads or an optimization area end to end, including analysis, design, implementation, and 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, garbage-collection barriers, 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.
Contribute to upstream LLVM where appropriate.

Desired Qualifications

Significant experience with LLVM optimization passes or code generation; LLVM commit access is a plus.
Experience with just-in-time compilers for managed languages such as HotSpot C2, Graal, V8, .NET RyuJIT, or similar.
Deep knowledge of x86_64 and/or AArch64 microarchitecture.
Experience with JVM internals, including garbage collection, deoptimization, and profiling.
A PhD in Computer Science or significant research experience in compilers.

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 Senior Compiler Performance Engineer to own major performance areas of Falcon. This is not a compiler front end role and not a compiler built from scratch: Falcon is mature and runs in production at large enterprises. Your job is to push its generated code further, deciding which optimizations matter, designing them and delivering measurable speedups on real workloads.

You will work in a distributed team of compiler experts, with direct influence on what Falcon optimizes next.

What You Will Do (aka Responsibilities)

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: 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

Contribute to upstream LLVM where it makes sense

What You'll Bring (Experience, Skills)

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

Nice to Have

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

About the Company

Azul Systems

OpenJDK-based Java performance solutions for enterprises

Azul Systems provides enterprise OpenJDK-based Java solutions designed to boost performance and security for cloud applications. Its product offerings include a Java platform licensed to customers, 24/7 support, and migration services that help organizations move from Oracle JDK to Azul with minimal downtime. Azul’s platform integrates with existing Java technologies and supports IoT and big data workloads, delivering low-latency, stable applications across millions of installations. The company differentiates itself by focusing on open Java implementation for enterprises, serving many Fortune 100 companies, and employing highly experienced Java engineers to ensure reliable operation and expert guidance. Azul’s goal is to help businesses run faster, more secure Java in the cloud, with easy migration, strong support, and scalable performance across diverse workloads.

Company size: 501-1,000
Company stage: Series F
Total funding: $177.7M
Headquarters: Sunnyvale, CA
Founded: 2002

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