---
title: 'Senior Compiler Performance Engineer at Azul'
canonical: 'https://feeny.ai/job/senior-compiler-performance-engineer-azul-prague-fgm7bthvxxma'
type: 'job'
last_seen: '2026-10-13'
---

# Senior Compiler Performance Engineer at Azul

- **Company:** Azul
- **Location:** Prague, Czech Republic
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-10-12
- **Last confirmed live:** 2026-10-13
- **Apply:** https://jobs.lever.co/azul/dea918e5-0b89-4781-b8af-0eb08b9a8e4f

## Job 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. 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 Staff Compiler Performance Engineer to set the technical direction for Falcon performance. 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. You will decide where the next significant performance gains come from, lead the design of the optimizations that deliver them, and make sure the compiler architecture supports the product roadmap. You will be the senior technical voice on a distributed team of compiler experts and a key partner for runtime, GC and product teams.

## 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
- 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

## About Azul

## Company Overview
- **One-liner**: Azul is the largest company 100% focused on Java and the JVM, providing the world’s most trusted Java platform for cloud and AI-first enterprises.
- **Entity Type**: Private (Venture-backed; latest funding round: Private Equity Round in November 2025)
- **Headquarters**: Sunnyvale, California, United States
- **Founded**: 2002
- **Founders**: Scott Sellers (CEO, President, Co-Founder) and Gil Tene (CTO, Co-Founder)

## Core Business
- **Primary Industries**: Software Development, Enterprise Java Infrastructure, Cloud Computing
- **Target Customers**: B2B – Enterprise, Fortune 100 companies, financial services, retail, telecommunications, manufacturing, and public sector
- **Mission/Purpose**: “To make Azul the heart of every modern cloud enterprise by prioritizing our customers’ success, maintaining our unwavering commitment to innovation and excellence, and advancing Java through community leadership.”

## Products & Services
- **Azul Platform Prime (formerly Zing)**: High-performance, low-latency JVM runtime for mission-critical applications, with advanced garbage collection and diagnostics.
- **Azul Platform Core (formerly Zulu)**: Free, open-source, commercially supported Java build (OpenJDK) for general-purpose workloads.
- **Azul Intelligence Cloud**: Analytics suite that provides insights from production Java runtime data to boost DevOps efficiency.
- **Azul Optimizer Suite**: Tools for tuning and optimizing Java application performance.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metric**: 
  - Annual Revenue: $55 million (as of most recent data)
  - Total Funding: $177.7 million across 7 rounds (including recent PE round in Nov 2025)
- **Notable Investors**: Series E (2006) with 5 investors; recent Private Equity round (2025) with 1 investor; earlier rounds include Series C ($36M), Series D ($30M), Series E ($42M). Specific names not fully detailed in available data.
- **Growth Signals**: 
  - Headcount: 270 employees (+9.9% YoY, +50 people)
  - LinkedIn followers: 48,997 (+50.9% yearly growth)
  - 36% of Fortune 100, 10 of world’s top 10 banks, and brands like BMW, Mastercard, Salesforce, Workday are customers.
  - Offices in 8 global locations; channel partners in 88 countries.

## Competitive Advantages
- **Largest independent Java engineering team** (second only to Oracle) – 100% focused on Java.
- **Deep expertise in JVM and runtime optimization** – proven by customers like top banks and Fortune 100 companies.
- **Commercial open-source model** – combines enterprise-grade support with community-driven innovation.
- **Proprietary technologies** (e.g., C4 garbage collector, purpose-built for low latency).

## Strategic Focus
- **Cloud and AI-first world**: Positioning Java as the core runtime for modern cloud enterprises.
- **Expanding Intelligence Cloud**: Leveraging production runtime data to improve DevOps and application performance.
- **Global reach**: Growing channel partnerships and presence in 14 countries, with remote/hybrid roles to attract top talent.

## Why Work Here
- **Culture**: “Respect, professionalism, innovation, diversity, inclusion, and maniacal focus on customers.” Rated 4.3/5 on employer reviews (78 reviews).
- **Work Model**: Hybrid and remote options available across many roles (e.g., remote in US, Canada, Europe, etc.).
- **Perks**: Company equity, generous parental leave, dental insurance, Flexible Spending Account (FSA), 401(K). Offices in Sunnyvale, Bengaluru, Dallas, Limassol, Prague, Singapore, Sydney, Yerevan.
- **Engineering Culture**: Focus on Java, JVM, compilers, and runtime performance – appealing to system-level engineers and open-source contributors.

## Sources
1. [Azul About Page](https://www.azul.com/about/)
2. [Azul Careers Page](https://www.azul.com/careers/)
3. [Azul on LinkedIn](https://linkedin.com/company/azul-systems)
4. [Azul on Built In](https://builtin.com/company/azul)
5. [Azul Jobs on Lever](https://jobs.lever.co/azul)

## Other roles at Azul

- [IT Intern, AI and Operations](https://feeny.ai/job/it-intern-ai-and-operations-azul-sunnyvale-mn9fw6kf84tc) — Sunnyvale, CA
- [Compiler Performance Engineer](https://feeny.ai/job/compiler-performance-engineer-azul-prague-fpxeq2qn9v1g) — Prague, Czech Republic
- [Senior Software Engineer - Optimizer Hub](https://feeny.ai/job/senior-software-engineer-optimizer-hub-azul-prague-h290md1tak97) — Prague, Czech Republic
- [Global Channel Operations Manager](https://feeny.ai/job/global-channel-operations-manager-azul-united-states-m1yzr649vqrg) — United States
- [HR Coordinator, nine-month contract](https://feeny.ai/job/hr-coordinator-nine-month-contract-azul-united-kingdom-13f01rgyfmzd) — United Kingdom
- [Enterprise Account Executive](https://feeny.ai/job/enterprise-account-executive-azul-bengaluru-qyhfb04jg454) — Bengaluru, India
- [Account Executive Sweden](https://feeny.ai/job/account-executive-sweden-azul-sweden-5vr4nmyqdc9b) — Sweden
- [Enterprise Account Executive, Azul Prime - (Remote)](https://feeny.ai/job/enterprise-account-executive-azul-prime-remote-azul-san-francisco-bay-area-d6r319e0c9c1) — San Francisco Bay Area, CA
- [LLVM Compiler Engineer](https://feeny.ai/job/llvm-compiler-engineer-azul-india-2z3qcdta2ngq) — India
- [Staff Compiler Performance Engineer](https://feeny.ai/job/staff-compiler-performance-engineer-azul-prague-0gx4twmbt85w) — Prague, Czech Republic