Job DescriptionAre you the kind of Senior Java Engineer who is an expert in the JVM and loves solving problems deep inside the runtime?We’re looking for a seasoned technical heavyweight — a true master of the Java ecosystem — who lives and breathes bytecode, understands the guts of the JDK, and thrives on solving deep, complex problems in live systems. This is not your average Java dev role — this is a chance to get hands-on with the runtime itself and shape the architecture of high-impact cybersecurity products used across global enterprises.What You'll Be Doing:Building and evolving bleeding-edge Java Agent technology used in modern runtime application security.Designing algorithms that dynamically transform running code to detect and neutralise threats in real-time.Working in the guts of the JVM — manipulating bytecode, exploring obscure APIs, and optimising performance under extreme conditions.Collaborating with elite engineers in a tight-knit R&D team where every line of code counts.Contributing to product innovation and setting best practices across engineering, security, and DevOps.RequirementsWhat You Bring:10+ years of serious Java engineering experience — including JVM internals, JIT, garbage collection, and low-level optimisations.Expert in low-level Java, Java Virtual Machine.Mastery of Java bytecode and classloading — you’ve probably written your own agents, class transformers, or custom instrumentation tools.Passion for secure software development and an instinct for rooting out vulnerabilities before they happen.Hands-on experience with complex debugging, performance tuning, and real-world system architecture.Confident communicator who thrives in a collaborative, intellectually curious environment.Nice-To-Haves:Familiarity with Groovy, Kotlin, Python, or TypeScript.Background in building developer tools or security products.Experience in mentoring or leading technical teams (or ambition to grow in that direction).BenefitsIf you are a strong very Senior Java Engineer up to Principal Engineer level or close it and you have the required Low-Level Java, JVM expertise, then please send your CV to Gerry Nolan at Stack and Co today via (emailprotected).RequirementsJava, Java Virtual Machine, JVM, Bytecode
#J-18808-Ljbffr