Ouissem BEN NASR
HPC system architect
Paris, FR
Profil professionnel
I'm a scientific computing engineer, with a strong experience using, developping and deploying scientific computing codes on HPC/Super-computing infrastructures, for various high-technolocy industries, including Aeropsace, Automotive and Oil & Gas. My everyday's work is to help engineering teams optimize the use of their hardware computing resources and the numeric models running on it, in order to focus on what they knwo best: Engineering!
Vue d'ensemble
15
15
years of professional experience
8
8
years of post-secondary education
Expérience
HPC System Expert
EDF (French Electricity Company)
Paris
2023.10 - Actuel
- Technical lead for Project CALYPSO, overseeing the successful deployment (June 2024) of a ~500‑node on‑premise FLEX HPC cluster for EDF’s nuclear‑energy division.
- Coordinating all technical stakeholders—EDF project team, internal datacenter teams, HPC vendor (BULL/EVIDEN), and external HPC/SysAdmin experts (INTM).
- Hands-on implementing and validating, including PUPPET stack configuration, RHEL 8 cluster installation, performance benchmarking (HPL/HPCC, OSU, IO500), acceptance testing vs. RFP targets, and early business-code validation;
- Currently preparing the RFP for a new HPC cluster.
HPC Operations Manager
EDF (French Electricity Company)
Paris
2020.05 - 2023.09
- Operational management of EDF’s large-scale mutualized HPC systems, ensuring reliable day‑to‑day operations (incidents, changes, problems management) across two TOP500‑class clusters: CRONOS (~2000 nodes) and GAIA (~1200 nodes).
- Coordinating and technical interface with all associated stakeholders, including EDF datacenter teams, the HPC vendor (BULL/EVIDEN), SysAdmin teams (INTM), and internal/external HPC expertise groups.
- Planning and leading annual full‑cluster maintenance, orchestrating a multi‑team 5‑day shutdown to perform major upgrades and updates involving SysAdmins, vendor teams, and HPC experts.
Tech Lead HPC Integration
Renault Group
Paris
2016.07 - 2020.05
- Leading the HPC software integration team, managing the full scientific computing stack (CFD—both in‑house and commercial—plus Manufacturing, Crash, NVH, and related domains).
- Developed HPC integration methodologies, including scripting (Bash/Python), containerization with Singularity, scheduler tuning (LSF), monitoring configuration, benchmarking, optimization, and performance/scalability testing.
- Handled advanced troubleshooting, operational incident resolution, and debugging of in‑house scientific codes.
Scientific Computing/CFD Developper
GTT
Paris
2016.01 - 2016.07
Scientific Computing/CFD Engineer
HyperLabs, IO.
Paris
2013.01 - 2016.07
Scientific Computing/CFD Research Engineer
CNES (French Space Agency)
Paris
2008.10 - 2012.10
Formation
Doctorat - Fluid Dynamics
Institut National des Sciences Appliquées
Rouen, FR 2008.11 - 2012.10
Master 2 - Energy and Aerospace Propulsion
Université Paris X
Paris, FR 2007.09 - 2008.09
Diplôme d'ingénieur - Mechanical Engineer
Ecole Nationale d'Ingénieurs de Tunis
Tunis, TN 2004.09 - 2007.06
Compétences
HPC: Benchmarking, architecture, profiling and performance analysis
Hardware: CPU (x86 Intel/AMD), GPU (NVidia), Interconnect (Infiniband, Ethernet)
Software: Scheduler (SLURM, LSF), OS (RHEL, Debian), GIT
Programming: MPI, OpenMP, Bash, Python, FORTRAN, C
Cloud: GCP (Terraform, Cluster Toolkit)
Computational Fluid Dynamics / CFD - Commercial: Starccm, Fluent ; Proprietary: ProLB (Renault), Code_Saturne (EDF) ; Open-source: OpenFOAM
Technical writing
Informations complémentaires
- Mechanical sports: F1
- Sports: Swimming, Diving, Handball, Football
- Photography: Mechanical sports, Aerospace & Aviation
Languages
French
Bilingue
English
Bilingue
Arabic
Bilingue
Extra-academic Activities
- 2004-2007: Member of the IAESTE association (International Association for the Exchange of Students for Technical Experience)
Chronologie
HPC System Expert
EDF (French Electricity Company)
2023.10 - Actuel
HPC Operations Manager
EDF (French Electricity Company)
2020.05 - 2023.09
Tech Lead HPC Integration
Renault Group
2016.07 - 2020.05
Scientific Computing/CFD Developper
GTT
2016.01 - 2016.07
Scientific Computing/CFD Engineer
HyperLabs, IO.
2013.01 - 2016.07
Doctorat - Fluid Dynamics
Institut National des Sciences Appliquées
2008.11 - 2012.10
Scientific Computing/CFD Research Engineer
CNES (French Space Agency)
2008.10 - 2012.10
Master 2 - Energy and Aerospace Propulsion
Université Paris X
2007.09 - 2008.09
Diplôme d'ingénieur - Mechanical Engineer
Ecole Nationale d'Ingénieurs de Tunis
2004.09 - 2007.06