Abed Ottou

Air Liquide is a world leader in gases, technologies and services for Industry and Health. Present in 60 countries with 66,500 employees and 27.1 billion euros in sales (2024). The Group operates critical industrial OT/IT environments subject to the highest security standards.

Long-term assignment within the GIO (Global Infrastructure Operations) department — a team of 5 engineers using Agile methodology on an international scope. Objective: securing and migrating non-compliant industrial sites to the IEC 62443 standard.

My responsibilities:

- Design and deployment of multi-site industrial secure network architectures

- Configuration of NGF firewalls (Fortinet FortiGate, Palo Alto PA-440)

- Design of OT/IT segmentation and micro-segmentation compliant with IEC 62443

- Conducting systematic security audits per site

- Management of critical changes in production 24/7

- Writing technical documentation (HLD, LLD, DAT)

- L3 support post-installation + transition to OCD teams

Achievements:

✅ 30+ multi-site secure architectures deployed

✅ 60+ firewalls configured and deployed

✅ 40+ sites migrated to IEC 62443 compliance

✅ 30+ security audits performed

✅ 50-70% reduction in security incidents

✅ 98% availability of industrial infrastructures

✅ 97% success rate for critical changes (3+/month)

Technical Environment

Fortinet FortiGate (60F/100F/200F/400F), Palo Alto PA-440, Cisco ASA, Cisco Catalyst, HP Aruba, Nutanix, VMware, AWS, MPLS, BGP, OSPF, VLAN, IPSEC/SSL VPN, VeloCloud SD-WAN, ServiceNow, Visio, Draw.io, IEC 62443, HLD/LLD/DAT, Agile, L3 MCO

Network security engineer, firewall, Fortinet FortiGate, Palo Alto,

OT/IT segmentation, IEC 62443, industrial security, critical infrastructure,

security audit, VLAN, VPN, MPLS, BGP, SD-WAN, L3 MCO,

technical documentation, HLD LLD DAT, secure network architecture

Orange is a global telecommunications operator with 40.3 billion euros in revenue (2024), 127,000 employees in 26 countries and 291 million customers. The Group operates carrier-grade networks with 99.999% availability.

Assignment within the SII group's network competence center for Orange (Arcueil site) — team of 6 network engineers/architects in collaboration with mobile project managers. Scope: mobile network core (IMS, 3G, 4G) and shared national LAN backbone, France.

My responsibilities:

- Qualification of project requirements (bandwidth, interfaces, addresses, traffic, security)

- Proposal of architectural solutions for the mobile core network

- Definition of hardware to be deployed (Cisco, Juniper, HP)

- Conducting technical feasibility pre-studies

- Writing architecture documents and engineering documents (HLD/LLD)

- Coordination with operations teams for commissioning

Achievements:

✅ 8 core mobile network architecture solutions for mobile projects

✅ 7 core mobile network deployments completed

✅ 10 engineering documents (HLD/LLD) produced

✅ Core network reliability through high-availability architectures

✅ Support for sizing IMS and admin LAN infrastructure

Cisco ASR, Juniper, HP, Fortinet, MPLS, BGP, OSPF, IS-IS, MPLS-TE, IMS, 3G/4G, Mobile Core Network, Shared LAN, Backbone, HLD/LLD, Carrier-grade

Network engineer, network architecture, carrier-grade, mobile core network,

Cisco ASR, Juniper, MPLS, BGP, OSPF, IMS, 3G 4G, backbone,

telecommunications, HLD LLD, high availability, network engineering

Transatel (acquired by NTT in 2019) is an international MVNO operator specializing in mobile connectivity for IoT and M2M, present in over 100 countries and serving millions of connected devices.

Assignment within the Transatel network team — support and maintenance of mobile and M2M/IoT network infrastructures internationally.

My responsibilities:

- L2/L3 support for MVNO mobile network infrastructures

- Maintenance and configuration of network equipment (routers, switches)

- Deployment of IoT/M2M connectivity solutions

- Troubleshooting and resolution of network incidents

- Monitoring and performance analysis of infrastructures

- Writing technical documentation and operational procedures

Achievements:

✅ 15+ network equipment deployed for MVNO infrastructures

✅ 50+ network incidents/month resolved — resolution rate >95%

✅ Network availability improved to 99.5%

✅ Connectivity support for thousands of IoT/M2M devices

Technical Environment

MVNO, IoT, M2M, Cisco, Routers, Switches, MPLS, VPN, L2/L3 Support, Troubleshooting, Network Monitoring, Cellular Connectivity, Connected Devices

Network engineer, MVNO, IoT, M2M, mobile connectivity, L2/L3 support,

network troubleshooting, monitoring, MPLS, VPN, Cisco,

network infrastructure, telecommunications, connected devices