Senior JVM C/C++ Developer, Markham

**Introduction** Are you driven by the challenge of building high-performance, scalable, and reliable systems software? Join our team of expert engineers developing the Java Virtual Machine (JVM) — the engine behind millions of applications across cloud, enterprise, and AI workloads. Built with the OpenJDK class libraries and the Eclipse OpenJ9 JVM , IBM Semeru Runtimes deliver high quality, strong security, and top performance to run Java applications on-prem or in the cloud. Rigorously engineered and tested to run on operating systems like Windows, macOS, and Linux and server platforms 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. We’re seeking talented technical leaders to work on one or more core components of the JVM: the **Virtual Machine Core, Garbage Collection** , and **Just-In-Time (JIT) Compilation** , and . Whether you're passionate about memory management, compiler optimizations, or runtime infrastructure, this role offers the opportunity to work at the heart of Java performance and innovation. **Why Join Us?** - Work on cutting-edge runtime technology used by millions of developers. - Tackle deep technical challenges that push the boundaries of performance and scalability. - Be part of a collaborative, world-class team of JVM engineers. - Enjoy flexible work arrangements, competitive compensation, and opportunities for career growth. - Influence the future of Java in cloud-native, AI, and enterprise environments. **Your Role And Responsibilities** Depending on your interests and expertise, you may: - Design and implement GC algorithms to optimize memory usage and reduce pause times. - Develop advanced JIT compiler optimizations to improve execution speed and startup performance. - Enhance the VM core, including threading, synchronization, class loading, and bytecode execution. - Analyze and tune performance across a wide range of workloads using profiling and telemetry tools. - Collaborate across teams to ensure seamless integration between GC, JIT, and VM subsystems. - Mentor junior developers in the field of software development - Contribute to and influence open-source projects such as Eclipse OpenJ9 and OpenJDK. - Support enterprise clients by diagnosing and resolving complex runtime issues in production environments **Preferred Education** Master's Degree **Required Technical And Professional Expertise** - Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field. - 3-6 years experience demonstrating strong proficiency in C or C++, with systems-level development experience. - Solid understanding of operating system fundamentals (memory, threading, synchronization). - Experience with debugging and profiling tools (e.g., gdb, perf, valgrind). - Excellent problem-solving skills and a passion for deep technical challenges. **Preferred Technical And Professional Experience** - Experience in one or more of the following areas: - Garbage Collection algorithms and memory management - Compiler theory and JIT optimization techniques - Virtual machine architecture and runtime services - Familiarity with Java internals, JVM architecture, and performance tuning. - Contributions to OpenJDK, Eclipse OpenJ9, or similar open source projects are a strong asset.