**Introduction** Open-Source Compiler Optimization Developer Do you have an eye for technical problem solving? Do you want to work on a runtime optimizing one of the top programming languages? Do you like doing whole stack performance analysis to optimize Java applications through benchmarking, tracing, profiling and debugging? Do you want to influence in runtimes and compiler optimization open-source communities? IBM produces an OpenJDK Java distribution called [1] IBM Semeru Runtimes that runs Java applications with the best performance, quality, and platform support in the industry. Rigorously engineered and tested to run on desktops like Windows, macOS, and Linux and servers such as Arm, X86, IBM POWER and Z systems, IBM Semeru Runtimes are built by a globally diverse team and used by hundreds of IBM software products and tens of thousands of customers, powering businesses from startups to giant corporations in virtually every industry. As an IBM Semeru Runtimes Compiler Developer, you will join a vibrant community of developers actively contributing to several GitHub open-source runtime projects using industry standard tools. Our development lifecycle and activities, from concept to delivery, happen openly in collaboration with community developers and researchers, and we support building your own developer identity and influence in the various programming languages and runtimes communities. As an IBM developer, you of course have access to the full range of IBM teams and technologies, so you can influence the whole stack optimization efforts in IBM: hardware design, OS/Kernel enhancements, language runtimes, middleware, cloud and cloud native applications. You will join the JIT (Just-In-Time) Compiler team where you will collaborate with a talented team of experienced developers to identify performance improvement opportunities through benchmarking and analysis, then implement new or tune existing features and optimizations in the JIT Compiler. You will collaborate with open community developers, hardware and OS teams, and up-stack products to drive changes and new features in achieving optimal whole stack performance. You will also collaborate to ensure performant implementation of new Java language features and new hardware/OS capabilities into our open-source Java runtime and compiler. Come and make your mark on thousands of Java products affecting an incredibly significant part of revenue for the IBM business and its customers. References Visible links 1. https://developer.ibm.com/semeru/semeru-runtimes/ **Your role and responsibilities** Your Role and Responsibilities: * Work with a team of experts to develop and support the JIT Compiler component within IBM Semeru Runtimes * Leverage your expertise in compiler and computer architecture to drive IBM Semeru compiler optimization technology forward * Execute on whole stack performance analysis to optimize Java applications through benchmarking, tracing, profiling and debugging for inefficiencies and bottlenecks * Become a subject matter expert both inside and outside of IBM to help thousands of IBM products and their many customers run performant applications **Required technical and professional expertise** * 2+ years of experience in C/C++ programming, data structures and algorithms * Solid knowledge of compilers and runtimes * Solid knowledge of one or more processor architectures, e.g. ARM, X86, POWER, Z * Bachelor’s degree in computer science or software engineering **Preferred technical and professional experience** * Experience in compilers, runtimes and operating systems * Experience in open-source development tools and projects * Experience in whole-stack performance analysis and problem determination, quick prototyping, and iterative experimentation * Understanding of the Agile development process * Excellent communication skills and proven ability in influencing open-source community developers, academic and industry partners IBM is committed to creating a diverse environment and is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, caste, genetics, pregnancy, disability, neurodivergence, age, veteran status, or other characteristics. IBM is also committed to compliance with all fair employment practices regarding citizenship and immigration status.