[Hiring] Senior Software Engineer @Azul

Role Description

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.

• Design, develop, and maintain high-performance Java services including protocols, APIs, data storage, and real-time optimization engines.
• Build and evolve server-side OptHub components that communicate with the JVM at scale across cloud and on-premises environments.
• Debug complex distributed systems issues with limited diagnostic data and under performance constraints.
• Design and implement observability, profiling, and diagnostic tooling to support both internal development and customer-facing deployments.
• Drive performance analysis and improvement: create benchmarks, interpret profiler output, and act on findings.
• Participate in design discussions and code reviews, raising the bar for the whole team.

Qualifications

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

Requirements

• Familiarity with JVM-adjacent technologies: JVM agents, JVMTI, bytecode manipulation (ASM, Javassist), or OpenJDK internals.
• Background in performance engineering, profilers (async-profiler, JFR, YourKit), or runtime observability.
• Experience with gRPC, Protocol Buffers, WebSockets or high-throughput messaging systems.
• Experience with process metrics, system observability and CI/CD pipelines.
• Prior work in a Java platform, middleware, or infrastructure product company.

Benefits

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