Senior Staff Systems Engineer - Performance Engineer - JVM

Stack

Responsibilities

• ▹Lead deep-dive performance investigations to identify and resolve systemic bottlenecks across the global JVM-based microservices architecture
• ▹Optimize resource efficiency by fine-tuning JVM parameters, garbage collection (ZGC, G1), and memory management
• ▹Build advanced observability tooling using eBPF, JFR, and Flamegraphs
• ▹Bridge the Linux Kernel and the JVM, optimizing thread scheduling (CFS/EEVDF) and resource isolation (cgroups) within Kubernetes
• ▹Architect and deliver scalable infrastructure improvements for long-term performance challenges
• ▹Share expertise and mentor others on JVM internals and performance best practices
• ▹Deep-dive into complex concurrency issues, lock contention, and memory leaks
• ▹Collaborate closely with the Computing Squad to align orchestration and performance strategies

Requirements

• ▹Deep, low-level JVM knowledge: JIT compilation (C1/C2), class loading, intrinsic methods
• ▹Extensive experience tuning JVM and GC algorithms (ZGC, G1, Shenandoah) for massive heaps and ultra-low latency
• ▹Deep understanding of the Linux Scheduler (CFS/EEVDF) and high-concurrency Java workload management
• ▹Mastery of heap and off-heap memory management (Direct Buffers, memory-mapped files) and leak diagnostics
• ▹Mastery of advanced diagnostics: Flamegraphs, JFR, eBPF, large-scale heap dump analysis
• ▹Extensive experience with cgroups and CPU throttling impact within Kubernetes/EKS
• ▹Proven ability to diagnose and resolve complex concurrency problems (lock contention, race conditions)
• ▹Knowledge of AWS infrastructure and its performance characteristics

Nice to have

• ▹Previous contribution to the OpenJDK project or other low-level runtime environments

Soft skills

What we offer

• ▹Opportunity to earn equity at Nu
• ▹Medical insurance
• ▹Dental and vision insurance
• ▹Life insurance and AD&D
• ▹Extended maternity and paternity leave
• ▹Nucleo learning platform
• ▹NuLanguage language learning program
• ▹NuCare mental health and wellness program
• ▹401K savings plan (Health Saving Account and Flexible Spending Account)
• ▹Work-from-home allowance
• ▹Relocation assistance package, if applicable

About the company

Nu is the leading digital bank in Latin America, serving 135 million customers across Brazil, Mexico, and Colombia. It leads an industry transformation through data-driven, proprietary technology, guided by its mission to fight complexity and empower people. Listed on the New York Stock Exchange (NYSE: NU).