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.
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
Skills Required
- 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, including SSA, data flow analysis, and loop transformations
- Ability to read assembly and reason about instruction sequence performance
- Experience with LLVM IR and LLVM optimization passes, or 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, Kotlin, or JVM internals
- MSc or PhD in Computer Science with a compiler or performance focus
What We Do
Azul is the only company 100% focused on Java, delivering the most trusted Java platform to the modern cloud enterprise. We provide the world’s best commercial support for OpenJDK to our customers by prioritizing their success, maintaining our unwavering commitment to innovation and excellence, and advancing Java through community leadership. Millions of Java developers, hundreds of millions of devices, and the world’s most highly regarded businesses - including 27% of the Fortune 100 - trust Azul to power their applications with exceptional capabilities, performance, security, value, and success. https://www.azul.com Twitter: @azulsystems Trademarked - AZUL, Zulu, Azul Zulu, Azul Zulu Prime, Azul Platform Prime, Azul Platform Core, Azul Intelligence Cloud, Azul Analytics Suite, Azul Optimizer Suite are either registered trademarks or trademarks of Azul Systems, registered in the U.S. and elsewhere. All other trademarks belong to their respective owners.
