LLVM Compiler Engineer

• Design, develop, and optimize new features for an LLVM-based Just-In-Time compiler for Java bytecode.
• Improve compiler optimizations and runtime performance for managed-language workloads.
• Contribute to LLVM improvements and enhancements that support high-performance language runtimes.
• Analyze compiler and application performance, identify bottlenecks, and implement targeted optimization strategies.
• Work with low-level architectures and instruction sets to improve generated code quality and execution efficiency.
• Collaborate with compiler, runtime, and performance engineering specialists in a distributed global environment.
• Contribute to open-source initiatives and participate in the broader Java and OpenJDK technical community.
• Apply strong compiler theory and software engineering practices to complex technical challenges.
• Help investigate and resolve difficult performance, code-generation, and compiler correctness issues.

Requirements

• 5+ years of experience developing LLVM-based compilers or substantial transferable experience with other compiler technologies.
• Strong C and C++ design and development skills, with the ability to work effectively on complex systems software.
• Strong theoretical and practical knowledge of compiler architecture, optimization, and development.
• Experience developing language runtimes and/or Just-In-Time compilers is highly valued.
• Solid understanding of x86_64 and/or ARM64 instruction sets and low-level optimization techniques is an advantage.
• Experience with performance analysis, profiling, benchmarking, and identifying optimization opportunities.
• Familiarity with Java, Scala, Kotlin, or other managed-language ecosystems is preferred.
• PhD in Computer Science or significant academic/research experience is considered an advantage.
• Strong analytical and problem-solving abilities, with an interest in tackling technically complex performance challenges.
• Ability to collaborate effectively within a distributed, international engineering team.

Benefits

• Competitive compensation package.
• Fully remote work option with flexible working hours.
• Opportunity to work alongside leading compiler, Java, and OpenJDK experts worldwide.
• High-impact role contributing to the evolution of Java performance and modern cloud infrastructure.
• Opportunities to contribute to open-source projects and the wider Java ecosystem.
• Premium IT equipment, including a MacBook Pro or hardware of your choice.
• 5 weeks of annual holidays plus 5 sick days.
• Access to modern offices in Prague, Limassol, and Belgrade, with hybrid or fully remote arrangements available.
• Employee referral program.
• Collaborative international environment with significant opportunities for technical growth and influence.