Genesys Systems Engineer supporting routing, IVR, and omnichannel contact center technology. Helping Forward Financing, a fintech lender, optimize customer and agent experiences.
About the role
- Senior Staff Performance Engineer optimizing JVM performance, Linux systems, and Kubernetes infrastructure. Improving scalability, latency, and costs for Nu, a Latin American digital bank.
Responsibilities
- Lead complex, high-level performance investigations across a global JVM-based microservices architecture
- Identify and resolve systemic bottlenecks
- Drive initiatives to reduce infrastructure costs and latency by tuning JVM parameters, garbage collection, and memory management
- Build advanced observability and diagnostic tooling using eBPF, JFR, and Flamegraphs
- Optimize Linux kernel and JVM alignment, including thread scheduling and resource isolation in Kubernetes
- Design and deliver scalable infrastructure improvements that address long-term performance challenges
- Share JVM internals and performance expertise with the Engineering team and mentor others
- Diagnose concurrency issues, lock contention, and memory leaks, providing definitive fixes
- Collaborate with the Computing Squad to align orchestration strategies with system performance goals
- Deep dive into prioritized problems to identify root causes
Requirements
- Deep, low-level knowledge of JVM internals, including JIT compilation (C1/C2), class loading, and intrinsic methods
- Extensive experience with GC algorithms (ZGC, G1, Shenandoah), including tuning them for massive heaps and ultra-low latency requirements
- Previous experience contributing to the OpenJDK project or other low-level runtime environments is a significant advantage
- Deep understanding of the Linux Scheduler (CFS/EEVDF), thread scheduling, and kernel management of high-concurrency Java workloads
- Mastery of heap and off-heap memory management, including Direct Buffers, memory-mapped files, and diagnosing complex memory leaks
- Mastery of Flamegraphs, JFR (Java Flight Recorder), eBPF, and large-scale heap dump analysis
- Extensive experience with cgroups and CPU throttling impact on JVM quotas within Kubernetes/EKS
- Proven ability to diagnose and resolve complex concurrency problems, including lock contention and race conditions at the instruction level
- Knowledge of AWS infrastructure and its performance characteristics
- Experience developing and delivering innovative solutions for medium- and long-term team-level or project-level challenges
- Understanding of the technical aspects, capabilities, and limitations of systems
- Ability to anticipate technical and product issues and make appropriate design decisions
- Enthusiasm for sharing knowledge and mentoring others
- At least 4 years of experience in a Staff, Senior Staff, or Principal Engineer role
- Availability to work onsite two to three days per week
- Legal authorization to work in the country where the position is located
Benefits
- Opportunity of earning equity at Nu
- Medical Insurance
- Dental and Vision Insurance
- Life Insurance and AD&D
- Extended maternity and paternity leaves
- Nucleo - Our learning platform of courses
- NuLanguage - Our language learning program
- NuCare - Our mental health and wellness assistance program
- 401K
- Saving Plans - Health Saving Account and Flexible Spending Account
- Work-from-home Allowance
- Relocation Assistance Package, if applicable
Job title
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Degree requirement
No Education Requirement
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