# Eric Grunwasser — CV

> Freelance Linux, Infrastructure & Cybersecurity Expert, based in Paris. More than 25 years of experience.

## Target role
Freelance assignments: Linux expertise, Infrastructure, Cybersecurity, System hardening, DevSecOps, Automation, Critical environments, High availability.

## Core skills
- Systems: Linux, Debian, Ubuntu, Red Hat Enterprise Linux (RHEL), CentOS, Rocky Linux, Oracle Linux, FreeBSD, OpenBSD, Windows Server
- Automation & DevOps: Ansible, Terraform, Puppet, Red Hat Satellite, HashiCorp Vault, GitLab CI/CD, Jenkins, Artifactory
- Infrastructure & virtualisation: VMware, Proxmox, Citrix, Kubernetes, Docker, LXC, VirtualBox
- Networking & security: Cisco, Check Point, Fortinet FortiGate, pfSense, OpenVPN, WireGuard, PrivX, iptables, CrowdSec, Fail2ban, ModSecurity
- Web & load balancing: Apache HTTP Server, Nginx, HAProxy, Traefik, Tomcat, IIS, Squid, MaxScale
- Observability: Nagios, Centreon, Zabbix, Cacti, Grafana, New Relic, Datadog, Dynatrace
- Data & backup: MySQL, Percona XtraDB, PostgreSQL, Veeam, NetBackup, Bacula, BorgBackup, rsync, XtraBackup
- IAM & messaging: FreeIPA, Red Hat IdM, Shibboleth, Keycloak, Postfix, DKIM, DMARC, SPF, SpamAssassin
- Artificial intelligence & LLMs: Mistral AI, OpenAI, ChatGPT, Codex, Anthropic, Claude Code, Gemini, Copilot, Kimi
- Management: Management of teams of up to 6 people, project management, budgets, incidents, changes and suppliers

Results-oriented approach focused on reducing risk, industrialising deployments, improving availability and controlling costs.
Eligible for TS security clearance under French IGI No. 1300 (formerly TSD).

## Experience
- January 2020–present: Infrastructure, Linux & Cybersecurity Consultant, GRUN IT Consulting, Paris.
  - Advised large enterprises and public-sector organisations on audits and training in security and automation best practices, helping improve compliance with ANSSI standards.
  - Provided level 3 support for Debian Linux and Red Hat Enterprise Linux / CentOS.
  - Integrated Red Hat Satellite into complex environments, trained teams and coordinated with vendor support.
  - Designed and deployed hardened OS baselines aligned with ANSSI BP-028 and DAT-NT28 guidance, improving the security of critical infrastructure.
  - Industrialised deployments with Ansible, Terraform, GitLab CI/CD, Jenkins and Artifactory.
  - Reduced hardened VM deployment time by 50% by optimising Terraform configurations, VMware templates and Ansible playbooks, and by using Mitogen.
  - Analysed security incidents and vulnerabilities, then defined and managed remediation plans to reduce risk and improve system resilience.
  - Deployed open-source alternatives to ChatGPT, including chatbots, APIs and Mistral AI models.
  - Used AI-assisted code generation and review with Codex and Claude Code.
  - Clients : Docaposte, Lacoste, Enedis, Consotrust, the French Ministry of the Interior and confidential assignments.
  - Clients: Docaposte, Lacoste, Enedis, Consotrust, the French Ministry of the Interior and confidential assignments.
- 2018–December 2019: Infrastructure Architect / Senior Systems and Network Administrator, Interflora, Lyon.
  - Led load and performance testing campaigns.
  - Implemented a disaster recovery plan.
  - Industrialised production deployments with Jenkins and Ansible.
  - Redesigned and standardised test, pre-production and production environments.
- 2018: Infrastructure Technical Expert, SII, Lyon.
  - Implemented automated deployments and production release pipelines with Jenkins and Ansible for Enedis's ADAJE team.
- 2016–2017: Infrastructure Architect / Senior Systems and Network Administrator, Interflora, Lyon.
  - Managed incidents and changes across infrastructure distributed over three data centres.
  - Designed a scalable platform to handle activity peaks, improving availability and reducing costs by 80%.
  - Migrated hosting from NBS to OVH and deployed Hybris to production.
  - Stack: Ansible, Proxmox, LXC, pfSense, Nginx, HAProxy, MaxScale and a Percona XtraDB cluster.
- 2015: IT Operations Manager, Profideo, Saint-Ouen.
  - Organised IT operations and managed a six-person team covering monitoring, incidents, service requests and systems and network architecture.
- 2013–2014: Systems Engineer, Amesys / Bull, Montpellier.
  - Administered VMware infrastructure across three data centres, with approximately 50 ESX hosts and 600 VMs; 200 XenApp applications; NetApp/IBM SAN storage; and PowerShell and Orchestrator automation.
- 2012–2013: Open Source Systems Engineer, Thanis, Paris.
  - Produced technical architecture documentation, optimised network flows, centralised logs with Syslog-NG, implemented Nagios/Munin monitoring and developed Perl/Bash scripts.
- 2009–2012: IT Manager, CIPAC, Nouméa.
  - Managed VMware virtualisation, Red Hat/Debian and Windows Server administration, Check Point/Astaro security, remote-site deployments and a four-person team.
- 2007–2008: Network and Systems Manager, Infolor, Montrouge.
  - Managed the information system and budget, Debian Linux, Cisco, NetBackup and Nagios/Cacti; conducted ISO 27001 audits; and led a multidisciplinary six-person team.
- 2006–2007: Network and Systems Administrator / IT Manager, Document Image Solution, Bidart.
  - Administered Windows and Debian Linux, backups, Exchange/OWA and Cisco VPNs; managed IT assets and supported approximately 80 workstations.
- 2001–2006: Systems Administrator / Project Manager, Atos, Nanterre.
  - Transitioned a managed-services contract; administered Citrix, Windows, Linux, Apache, PHP, MySQL, Exchange, Domino and NetBackup; and handled level 2 incidents. Clients: BNP Paribas, Cetelem, DGA and AESN.

## Certifications & continuing education
- [IBM Cybersecurity Analyst](https://www.credly.com/badges/59db769a-5ffa-4c3f-a1fc-e4711327636d/public_url), 2024
- [Google Cybersecurity Professional Certificate](https://www.credly.com/badges/806042c5-ed4d-454b-84a4-3167043e72ca/public_url), 2024

## Education
- Two-year technical degree in Industrial IT, ECE Tech (formerly ECTEI), 1998–2000
- Technical Baccalaureate in Electrical Engineering, Lycée Gaston Crampe, 1998

## Languages
- French: Native, C2
- English: Intermediate, B1/B2
- Spanish: Basic, A1

## Interests
- Artificial intelligence & technology: Continuous technology monitoring
- Travel & photography: Visited more than 50 countries.

## Contact
- Status: Open to opportunities
- Availability: approximately 1 month
- Email: eric@grunwasser.fr
- [Book an appointment](https://calendar.google.com/calendar/appointments/schedules/AcZssZ1jHX4CoSOkGOgDr-UQ3FS0-Ohbe1f20OGiyQr0KGFlB5-pjXc9ie5C2ZiN_IMeQZ_RYrQwsJBJ)
- [LinkedIn](https://www.linkedin.com/in/eric-grunwasser)
- [Malt](https://www.malt.fr/profile/ericgrunwasser)
- [GitHub](https://github.com/grunwasser)
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