# Senior Performance Engineer

**Company**: Cisco
**Location**: Krakow
**Work arrangement**: hybrid
**Experience**: senior
**Job type**: full-time
**Category**: Engineering
**Industry**: Technology

**Apply**: https://cisco.wd5.myworkdayjobs.com/en-US/Cisco_Careers/job/Krakow-Poland/Splunk-Senior-Staff-Software-Engineer---Performance-Optimization---Innovation--PerfOpt-_2026523-1?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply
**Canonical**: https://yubhub.co/jobs/job_41192e41-cde

## Description

The Performance Optimization and Innovation (PerfOpt) team at Cisco improves the Splunk customer experience through deep performance work. As a Senior Performance Engineer, you will serve as the performance authority for critical issues, roadmap planning, architecture reviews, and customer conversations. Your responsibilities include:

- Leading a performance domain end-to-end, including hypothesis, instrumentation, design, and measured customer-visible gain in production

- Architecting for scale, designing and re-architecting subsystems in a distributed, petabyte-scale system

- Being responsible for the performance methodology, including profiling and flame graph practice, lock contention analysis, and benchmarking

- Introducing observability, designing new telemetry sources and bringing eBPF and continuous profiling into production use

- Enabling leadership decisions, explaining the problem costs, options, and risks to Directors and Managers

- Delivering fast and making everyone faster, working agentically and building reusable AI agentic workflows and tooling

- Leading and mentoring senior and staff engineers

The ideal candidate will have:

- Expert-level C++ in production systems, including memory management and allocators, move semantics, and cache-friendly data structures

- Deep performance engineering experience, including CPU/memory profiling, flame-graph analysis, lock contention resolution, and latency optimization in distributed architectures

- Strong Python skills for tooling, benchmark harnesses, telemetry pipelines, and performance data analysis

- Experience with Docker and Kubernetes, Linux performance internals, and Git and CI for automating builds, tests, benchmarks, and releases

- A track record of informing leadership decisions, distilling complex problems into comparable data points, and clear, concise communication across audiences

- Experience with AI savviness applied to delivery speed, leading, mentoring, and growing engineers

The role offers:

- Performance problems at a scale few companies have, with petabytes of data and measurable impact from every millisecond removed

- A constant stream of new things to learn, with expansion into new areas, open source projects, and new technologies

- Exceptionally versatile and dedicated peers, career growth through technical ownership, leadership opportunities, and coaching

- A stable work environment with clear ownership and measurable goals, flexible hybrid work model, and benefits including flexible hybrid work, growth and mentorship opportunities, and a collaborative, supportive team

## Skills

### Required
- C++
- performance engineering
- Python
- Docker
- Kubernetes
- Linux
- Git
- CI
- eBPF
- continuous profiling
- benchmarking
- flame-graph analysis
- lock contention resolution
- latency optimization

### Nice to have
- petabyte-scale data flow
- Splunk internals
- storage/query engine
- distributed search optimization
- hardware-level work
- Go
- Rust
- AWS
- Azure
- GCP
- Terraform
- Puppet
- Ansible

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Source: [Apply at cisco.wd5.myworkdayjobs.com](https://cisco.wd5.myworkdayjobs.com/en-US/Cisco_Careers/job/Krakow-Poland/Splunk-Senior-Staff-Software-Engineer---Performance-Optimization---Innovation--PerfOpt-_2026523-1?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)