# Splunk Staff Software Engineer - Performance Optimization & Innovation (PerfOpt) at Cisco AI Level 2, AI centrality 45 out of 100. Krakow, Poland. ## Details - Company: [Cisco](https://jobsbylevel.com/companies/cisco) - AI level: AI Level 2 (score 45 out of 100) - Location: Krakow, Poland - Posted: October 6, 2026 - Apply: https://jobsbylevel.com/go/798b7fdd-ad79-4e3d-a47a-caf7b47828cb ## Description Meet The Team The Performance Optimization and Innovation (PerfOpt) team improves the Splunk customer experience through deep performance work, and sets Splunk's long-term performance standards through guidelines and design. We work where performance is won or lost: search and indexing hot paths, cache and bloomfilter efficiency, S3 transfer throughput, I/O workload management, and parallelism in the data retrieval path. It's a C++ core moving petabyte-scale data across a large distributed architecture, and the results land in what customers feel - search latency, ingest throughput, and infrastructure cost. We are also the organization's performance center of gravity: the benchmarking, design patterns, and engineering standards other teams adopt come from here. Your Impact Senior performance engineers advise teams on roadmap and architecture, resolve customer performance issues, and set technical direction across partner teams. Lead performance work from hypothesis through instrumentation and design to measured customer impact, coordinating across teams as needed. Design petabyte-scale components for memory, concurrency, I/O, and tail latency, guiding architecture for scalability and reliability. We use profiling, flame graphs, lock contention analysis, benchmarks, and CI regression gates to identify and prevent performance issues. We instrument production with telemetry, eBPF, and continuous profiling to measure performance in real workloads. Compare performance options, quantify costs and risks, and present evidence-based recommendations to partners. Reusable AI workflows shorten performance analysis from days to hours. Engineers set targets, verify results with profiles and benchmarks, and adjust when evidence falls short. Plan performance work, estimate effort, and lead postmortems to identify root causes and prevent regressions. Mentor peers and less experienced engineers on the team. Minimum Qualifications Technical depth Advanced C++ in production, including memory management , allocators, move semantics , cache-aware structures, and performance trade-offs . Deep performance engineering - depth across the below, production experience with several: CPU/memory profiling and flamegraph analysis (perf, eBPF, VTune), including off-CPU and continuous profiling. Lock contention resolution - hot mutexes, false sharing, atomics and memory ordering, lock-free techniques and when not to use them. Latency optimization in distributed architectures - tail latency, queuing, fan-out amplification, backpressure, critical path analysis. Benchmarking - micro and workload benchmarks, sound test design and statistical analysis, sub-system validation CI regression detection. Performance modelling - analytical or capacity models that help predict scaling limits and validate measured results Architecture and system design - design and improve existing solutions for performance, scalability and operability, and explain those designs to a critical audience. Docker and Kubernetes - performance characterization in containerized environments. Strong Python for tooling, benchmark harnesses, telemetry pipelines, and performance data analysis. Linux performance internals - scheduler, memory subsystem, page cache, filesystems, block I/O, network stack. Git and CI (e.g. GitLab CI) for automating builds, tests, benchmarks, and releases. Leadership Track record of informing technical decisions - quantifying trade-offs, surfacing risk early. Distilling sophisticated problems into comparable data points without losing the nuance or hiding uncertainty. Clear, concise, high-signal communication across audiences - mechanism-level with engineers, trade-off-level with leadership, impact-level with customers. AI savviness applied to delivery speed - daily use of AI coding agents on production work, building agentic workflows the team adopts and applying a high bar for verifying AI output against profiles, benchmarks, and telemetry. Mentor and grow engineers - The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/splunk-staff-software-engineer-performance-optimization-innovation-perfopt-at-cisco-27897d Source: https://jobsbylevel.com/jobs/splunk-staff-software-engineer-performance-optimization-innovation-perfopt-at-cisco-27897d ## Cite this page Level. https://jobsbylevel.com/jobs/splunk-staff-software-engineer-performance-optimization-innovation-perfopt-at-cisco-27897d. Get job alerts: https://jobsbylevel.com/newsletter