Performance Engineer - Open Source | Scale & Benchmarking

Lever, Inc. is seeking a Performance Engineer - Open Source based in France. You will drive performance, efficiency, scalability, and correctness across the full software stack—from CPUs, kernels, and runtimes to databases and web technologies.

You will develop shared tooling, dashboards, and measurement frameworks, strengthen test harnesses and pipelines, and mentor engineers to build a culture of measurement and engineering rigor.