Senior Software Engineer (Java) - Optimizer Hub

Your Role

As a Senior Software Engineer on the Optimizer Hub team, you will design and build the server-side services that sit at the heart of our JVM performance platform. You will work closely with product managers, performance engineers, and JVM experts to deliver high-quality, scalable backend components.

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Design, develop, and maintain high-performance Java services including protocols, APIs, data storage, and real-time optimization engines.

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Build and evolve server-side OptHub components that communicate with the JVM at scale across cloud and on-premises environments.

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Debug complex distributed systems issues with limited diagnostic data and under performance constraints.

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Design and implement observability, profiling, and diagnostic tooling to support both internal development and customer-facing deployments.

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Drive performance analysis and improvement: create benchmarks, interpret profiler output, and act on findings.

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Participate in design discussions and code reviews, raising the bar for the whole team.

Key Requirements

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• 5+ years of strong professional Java development experience, with a focus on backend and server-side systems.
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• Deep understanding of JVM internals: memory management, garbage collection, JIT compilation, and threading.
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• Experience building and operating distributed systems and microservices in production.
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• Proficiency with concurrency, low-latency design, and performance optimization techniques in Java.
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• Experience with cloud platforms (AWS, Azure, or GCP) and container orchestration (Kubernetes).
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• Ability to design clean APIs and protocols; comfort working close to the metal when needed.
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• Strong debugging skills — you can track down hard-to-reproduce production issues with limited data.

Nice to Have

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• Familiarity with JVM-adjacent technologies: JVM agents, JVMTI , bytecode manipulation ( ASM , Javassist), or OpenJDK internals.
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• Experience with C/C++ or other low-level languages — helpful when reading JVM source or performance-critical native code.
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• Background in performance engineering, profilers (async-profiler, JFR , YourKit), or runtime observability.
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• Experience with gRPC, Protocol Buffers, or high-throughput messaging systems.
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• Prior work in a Java platform, middleware, or infrastructure product company.

We Offer

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• Referral Program — help us grow with great people.
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• Premium IT equipment — MacBook Pro or hardware of your choice.
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• 5 weeks of holidays + 5 sick days.
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• Flexible working hours; full remote possible.
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• Prague city center offices.
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• Work alongside top experts worldwide contributing to the Java ecosystem.