{"id":2378824,"url":"https://alion.io/job/azul-compiler-performance-engineer","title":"Compiler Performance Engineer","company":{"id":95669,"name":"Azul","domain":"azul.com","url":"https://alion.io/company/azul-3","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":85,"open_postings":5,"ghost_share":0,"stale_share":0.6,"repost_share":0,"time_to_fill_p50_days":56,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Backend","role_family":"Backend","seniority":"junior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Prague, Czech Republic","Belgrade, Serbia","Limassol, Cyprus","Toronto, Canada","United States"],"countries":["CZ","RS","CY","CA","US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":2,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Java","optional":false},{"name":"LLVM","optional":false},{"name":"OpenJDK","optional":false},{"name":"C","optional":true},{"name":"GCC","optional":true},{"name":"Kotlin","optional":true},{"name":"Scala","optional":true}],"status":"live","first_seen_at":"2026-10-12T14:34:00Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-12T22:53:38Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"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.\nFalcon 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.\nWe 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.\nYou will join a distributed team of compiler experts and work on real workloads with direct, measurable impact on customer performance.\nWhat You Will Do\nAnalyze performance of Java benchmarks and customer workloads, find gaps in generated code and trace them to their root cause in the compiler\nImplement 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\nImprove code generation for x86_64 and AArch64\nWrite tests and benchmarks that prove the improvement and protect it from regressions\nContribute changes upstream to LLVM where it makes sense\nMinimum Requirements\n2+ years of professional experience in compilers, JIT compilers or low level performance engineering\nStrong C++ design and coding skills\nSolid understanding of compiler optimization theory: SSA, data flow analysis, loop transformations\nAbility to read assembly and reason about why one instruction sequence is faster than another\nNice to Have\nExperience with LLVM IR and LLVM optimization passes, or with another optimizing compiler such as HotSpot C2, Graal, GCC or V8\nExperience with profilers such as perf, VTune or async profiler\nKnowledge of x86_64 and/or AArch64 microarchitecture\nExperience with Java, Scala or Kotlin, or with JVM internals\nMSc or PhD in Computer Science with a compiler or performance focus\nWhat We Offer\nOpportunity to make a high impact at a growing, global company\nWork alongside top experts worldwide contributing to the Java ecosystem\nReferral Program - 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