{"id":2378829,"url":"https://alion.io/job/azul-senior-compiler-performance-engineer","title":"Senior 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":"2026-10-13T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","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":{"min_usd":45000,"max_usd":98000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":8},"experience_years_min":5,"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":".NET","optional":true},{"name":"C#","optional":true}],"status":"live","first_seen_at":"2026-10-12T14:31:17Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-13T12:20:25Z","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 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.\nYou will work in a distributed team of compiler experts, with direct influence on what Falcon optimizes next.\nWhat You Will Do\nOwn performance of Falcon for a set of workloads or an optimization area end to end: analysis, design, implementation, validation\nDesign 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\nDrive code generation quality on x86_64 and AArch64, including bringing Falcon to new hardware platforms\nInvestigate complex performance issues reported by customers and turn findings into compiler improvements\nReview code, mentor engineers on the team and raise the bar for performance methodology\nMinimum Requirements\n5+ years of professional experience developing optimizing compilers or JIT compilers\nStrong C++ design and coding skills in large codebases\nProven track record of delivering compiler optimizations with measurable performance impact\nDeep knowledge of compiler optimization theory and its practical tradeoffs: compile time, code size, correctness\nStrong performance analysis skills: profilers, hardware counters, reading and reasoning about generated assembly\nNice to Have\nSignificant experience with LLVM optimization passes or code generation; LLVM commit access is a plus\nExperience with JIT compilers for managed languages: HotSpot C2, Graal, V8, .NET RyuJIT or similar\nDeep knowledge of x86_64 and/or AArch64 microarchitecture\nExperience with JVM internals: garbage collection, deoptimization, profiling\nPhD in Computer Science or significant research experience in compilers\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 - help us grow with great people\nPremium IT equipment - MacBook Pro or hardware of your choice\n5 weeks of holidays + 5 sick days\nFlexible working hours\nPrague / Limassol / Belgrade city center offices OR hybrid/full-remote - UP TO YOU\nCompetitive compensation","description_format":"text","description_chars":3152,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"phd","optional":false},"security_clearance":false,"languages":[]},"benefits":["Apple Macbook","Flexible schedule"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"},{"name":"Canada","iso":"CA","kind":"country"},{"name":"Cyprus","iso":"CY","kind":"country"},{"name":"Czech Republic","iso":"CZ","kind":"country"},{"name":"Serbia","iso":"RS","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Cloud Platforms (IaaS & PaaS)","Developer Tools"],"lifecycle":[{"event":"open","at":"2026-10-12T19:02:06Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":56,"reasons":["conf:0","win:early"],"computed_at":"2026-10-13T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/azul-senior-compiler-performance-engineer","json_url":"https://alion.io/job/azul-senior-compiler-performance-engineer.json","meta":{"generated_at":"2026-10-13T13:50:53Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":21318,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":95669},"rest":"https://alion.io/mcp/rest/get_company?id=95669"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fazul-senior-compiler-performance-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fazul-senior-compiler-performance-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fazul-senior-compiler-performance-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/azul-senior-compiler-performance-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fazul-senior-compiler-performance-engineer"}]}