Compiler Performance Engineer

Accountabilities • Analyze Java benchmarks and customer workloads to identify performance gaps in generated machine code and determine their underlying causes within the compiler.

• Implement and refine compiler optimizations across the middle end and back end, including inlining, loop transformations, vectorization, redundancy elimination, and speculative optimizations.

• Investigate how compiler optimizations interact with runtime behavior and identify opportunities to improve execution efficiency.

• Improve machine code generation for x86_64 and AArch64 processor architectures.

• Evaluate optimization strategies and assess their impact on runtime performance, code quality, and execution efficiency.

• Develop and maintain tests and benchmarks that demonstrate performance improvements and protect against regressions.

• Use systematic performance analysis and debugging techniques to investigate complex compiler behavior and validate proposed solutions.

• Contribute relevant improvements to upstream LLVM, supporting the continued advancement of shared compiler infrastructure.

• Collaborate with compiler engineers in a distributed team to review solutions, share technical insights, and deliver measurable performance improvements.

Requirements:

• At least 2 years of professional experience in compiler development, JIT compilers, or low-level performance engineering.

• Strong C++ programming and software design skills, including the ability to work effectively with complex codebases.

• Solid understanding of compiler optimization theory, including Static Single Assignment (SSA), data flow analysis, and loop transformations.

• Ability to read and interpret assembly code and explain why particular instruction sequences perform better than others.

• Strong analytical and problem-solving skills, with the ability to investigate performance bottlenecks and translate findings into effective technical solutions.

• Ability to develop reliable tests and benchmarks to validate optimizations and ensure performance improvements are repeatable.

• Effective collaboration and communication skills for working with a distributed team of engineering specialists.

Preferred qualifications:

• Experience with LLVM Intermediate Representation (IR) and LLVM optimization passes, or another optimizing compiler such as HotSpot C2, Graal, GCC, or V8.

• Familiarity with performance profiling tools such as perf , VTune, or async-profiler.

• Knowledge of x86_64 and/or AArch64 microarchitecture and its impact on generated code performance.

• Experience with Java, Scala, Kotlin, or JVM internals.

• A master's degree or PhD in Computer Science, particularly with a focus on compilers or performance engineering.

Benefits:

• Remote work opportunity within India.

• Opportunity to work on a production-grade Java JIT compiler used in enterprise environments.

• Hands-on experience solving challenging compiler optimization and low-level performance problems.

• Collaboration with a distributed team of compiler experts.

• Opportunity to contribute to LLVM and other compiler optimization initiatives.

• Direct, measurable impact on application performance across real-world workloads.

• Opportunities to deepen expertise in C++, compiler architecture, machine code generation, and modern processor architectures.

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