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LeadFull-timeJavaRustC++API
About the Role
We are looking for a Staff Software Engineer to join our team as a technical leader. This role focuses on designing, implementing, and optimizing core VM subsystems including runtime, JIT/AOT compilation, memory management, scheduling, and OS/hardware interfaces. You will set architecture direction, mentor engineers, and collaborate cross-functionally to ship production-grade features.
Key Responsibilities
- →Lead the design and architecture of core VM components (runtime services, JIT/AOT compiler pipelines, GC, thread scheduling, synchronization primitives)
- →Own end-to-end delivery of complex features from ideation and design reviews to implementation and benchmarking
- →Profile and optimize latency-critical paths across runtime, compiler, OS, and hardware boundaries (NUMA, caches, micro-architecture, syscall/IO paths)
- →Establish technical standards and code quality practices; drive design documents, RFCs, and engineering reviews
- →Collaborate with performance engineering to define and hit SLOs for tail latency, throughput, footprint, and startup/warm-up
- →Advance observability in the VM (metrics, tracing, perf counters) to diagnose GC pauses, compilation stalls, safepoints, and contention
- →Mentor and coach engineers; cultivate a culture of rigorous design, empirical validation, and respectful collaboration
- →Contribute to roadmap planning, risk management, and release criteria; communicate trade-offs to stakeholders
Requirements
- ✓10+ years of systems-level software development with deep expertise in C and C++ (performance, memory safety, concurrency)
- ✓Strong knowledge of virtual machine internals: runtime services, class/method metadata, bytecode/IR pipelines, safepoints, deoptimization, inline caches
- ✓Familiarity with compilers (JIT and/or AOT): IR design, code generation, register allocation, inlining, tiering, and optimization passes
- ✓Solid understanding of operating systems (Linux preferred): processes/threads, scheduling, memory management (NUMA, huge pages), filesystems, networking
- ✓Working knowledge of computer architecture and hardware performance: caches, TLB, branch prediction, SIMD, PMU/perf tooling
- ✓Proven ability to design clean, scalable architectures and write high-quality design docs; expertise in API/ABI boundaries and componentization
- ✓Comfort with performance analysis tools: perf, eBPF, VTune, flame graphs, micro-benchmarks; methodical approach to measurement and regression control
- ✓Excellent problem-solving and debugging skills for complex, concurrent systems
- ✓Clear communication, cross-team collaboration, and ability to lead technical initiatives
Benefits
- ★Equity program - be part of the company success
- ★Annual bonus based on company performance
- ★Referral program - bring your colleague we would all love to work with
- ★IT equipment - MacBook Pro or any other hardware according to your preferences
- ★Work-life balance - 5 weeks of holidays, 5 sick days, flexible working hours, 100% work from home also possible
- ★Offices in Prague City Centre - if you prefer
- ★Most importantly you will work with top experts worldwide who contribute to the Java ecosystem
