Posted 25 days ago
Senior Compiler Performance Engineer
@ Azul
Toronto, Ontario
Overview
Azul is hiring a Senior Compiler Performance Engineer to own major performance areas of Falcon, its optimizing JIT compiler built on LLVM. The role covers end-to-end optimization work across analysis, design, implementation and validation, with a focus on generated code quality on x86_64 and AArch64. The posting states remote-first work with optional office locations in Prague, Limassol or Belgrade, and competitive compensation.
Responsibilities:
- Own Falcon performance for set workloads or optimization areas end to end
- Design and implement middle end and back end optimizations
- Drive code generation quality on x86_64 and AArch64
- Investigate complex customer performance issues
- Review code and mentor engineers
Requirements summary:
- 5+ years developing optimizing or JIT compilers
- Strong C++ design and coding skills in large codebases
- Proven record of measurable compiler optimization impact
- Strong performance analysis skills with profilers and hardware counters
- Nice to have: LLVM experience, JVM internals, x86_64 or AArch64 microarchitecture knowledge
Tools & skills
Benefits mentioned
Source and dates
Employer career site / ATS feed · lever
- Employer posting date
- 2026-10-12
- First seen by our source
- 2026-10-12
- Source record updated
- 2026-10-20
These dates describe the source record, not a live verification that the employer is still hiring. Check the original posting.
Job details
| Seniority | Senior |
| Department | Software development |
| Experience | 5+ years |
| Hours per week | 40 (estimated) |
| Work setting | Home, Office |
| Position | Mostly sitting |
| Physical demands | physical low · computer high |
| Languages | English |
| Perks mentioned | Generous paid time off, Flexible hours |
Summary and details written by AI from the posting; the employer’s posting is the authority.
Azul
| Field | Value |
|---|---|
| Headquarters | Sunnyvale |
| Open jobs on Jobsy | 3 |
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 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
- 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
Minimum Requirements
- 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
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
- Competitive paid holidays and sick time
- Flexible working hours
- Remote first OR Prague / Limassol / Belgrade city center offices OR hybrid - UP TO YOU!
- Competitive compensation
Journal
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