Senior Staff Performance Engineer — Scale & Innovation

Cisco; Kraków; On-site; PLN 360,000 - 420,000; Full time

Job summary

Splunk is seeking a senior data-performance engineer to join the PerfOpt team in Kraków. You will own performance across search, indexing, and data flows, shaping guidelines and designs for large-scale systems.

Lead end-to-end reliability improvements, design memory and concurrency strategies, and observability with profiling to quantify field impact and drive cross-team decisions. Contribute to scalable architectures and performance methodologies while mentoring engineers and collaborating with

Qualifications

• Expert-level C++ in production systems with memory management and allocators.
• Deep performance engineering across profiling, benchmarking, and analysis.
• Experience with latency optimization in distributed systems.
• Benchmarks and CI regression validation.
• Performance modelling and capacity planning.
• Architectural design to improve performance and scalability.
• Container performance with Docker and Kubernetes.
• Python tooling for benchmarking and telemetry.
• Linux performance internals (scheduler, memory, I/O).
• Git and CI automation (GitLab CI).

Responsibilities

• Serve as the performance authority for issues, roadmaps, reviews.
• Lead a performance domain end-to-end from hypothesis to production gains.
• Architect scalable subsystems in a distributed, petabyte-scale system.
• Own the performance methodology: profiling, analysis, benchmarking.
• Introduce observability with new telemetry and in-production profiling.
• Support leadership with data-driven recommendations.
• Drive automation and AI-enabled workflows to speed analysis.
• Mentor senior and staff engineers.

Skills

C++ expert

Performance engineering

Latency optimization

Benchmarking

Performance modelling

System design

Docker & Kubernetes

Python for tooling

Linux performance internals

Git & CI

Education

Bachelor's/Master's/PhD in related field

Tools

eBPF

VTune

perf

GitLab CI

Job description

Splunk is seeking a senior data-performance engineer to join the PerfOpt team in Kraków. You will own performance across search, indexing, and data flows, shaping guidelines and designs for large-scale systems.

Lead end-to-end reliability improvements, design memory and concurrency strategies, and observability with profiling to quantify field impact and drive cross-team decisions. Contribute to scalable architectures and performance methodologies while mentoring engineers and collaborating with