Data Reduction Physicist, Geneva

The NGT Real-time Reconstruction Revolution will transform the CMS High-Level Trigger into an offline-quality reconstruction facility processing up to 750 kHz of events. To make this sustainable, you will lead the design of two complementary data tiers: a low-level reconstructed format that enables trigger rates several times higher than conventional raw-data output while preserving the the option for future reprocessing, and a compact analysis format to save the full 750 kHz stream of online reconstructed events.

Your responsibilities

Design next-generation data structures that push the limits of data reduction while preserving physics performance and analysis flexibility.

Ensure all formats are accelerator-native (e.g., structure-of-arrays, SoA) and optimised for high-throughput GPU processing.

Build an end-to-end framework to rigorously quantify the impact of lossy compression, with clear metrics, reference analyses, and automated regression tests.

Benchmark compression/decompression under realistic workloads: CPU/GPU cost, I/O throughput, memory footprint, and latency.

Advance lossless compression, leveraging R3-reconstructed objects and pioneering AI/ML techniques.

Improve raw data structure to achieve higher compressibility and faster data access.

Be sure to meet the eligibility criteria

By the application deadline, you have a master’s degree with 2 to 6 years of professional experience since graduation or a PhD with a maximum of 3 years of professional experience since graduation. You are not eligible with only a bachelor’s degree.

You have never had a CERN fellow or graduate contract before.

Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

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