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William jums

@williamjums

Network security engineer at MOSS in defense, who built Python tools for firewall migration, rule generation, and ANSSI compliance checks.

France
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At MOSS, I ran Stormshield firewalls connecting more than 10 sites across France for a defense client, supporting high-availability IPsec tunnels and enforcing security policies aligned with ANSSI recommendations.

I built three Python tools to reduce repetitive firewall work: an SMC migration toolkit, tools for preparing and comparing flow rules, and first-pass ANSSI compliance checks. They include safeguards such as dry runs, automated tests, and engineer review before generated scripts are used.

At CELINE, I delivered more than 60 EMEA store openings on Meraki SD-WAN, handling network design and connectivity while meeting every opening date. At Société Générale, I contributed to the migration of more than 2,600 branches from MPLS to Cisco Viptela SD-WAN.

My experience also includes F5 BIG-IP proxy and WAF operations at BNP Paribas, anti-DDoS work at Axians CSP, and FortiGate deployments at Intrinsec. I’m currently training in AI engineering and building self-hosted MCP servers and agent skills in my personal projects.

Experience

Work history, roles, and key accomplishments

CE

Network / Security Engineer

CELINE

Jan 2023 - Dec 2024 (1 year 11 months)

Delivered 60+ EMEA store openings on Meraki SD-WAN, including network design, bandwidth sizing, and VLAN configuration. Recovered a store offline mid-migration using temporary internet access and CDP/LLDP.

SG

Network / Security Engineer

Mar 2020 - Dec 2022 (2 years 9 months)

Acted as client-side technical authority for SD-WAN migration of 2,600+ branches from MPLS to Cisco Viptela. Integrated control plane in data centers, set up BGP routing, and supported rollout of ten branches per day.

FC

Network / Security Engineer

Feducia for CELINE

Jan 2019 - Feb 2020 (1 year 1 month)

Migrated 40+ EMEA stores from MPLS to Internet SD-WAN using Meraki, including WAN links, telephony, and fiber backbone.

AC

Network / Security Engineer

Axians CSP

Dec 2017 - Jan 2019 (1 year 1 month)

Built Wanguard anti-DDoS from scratch using Juniper MX J-Flow and BGP diversion, and tuned thresholds per ISP. Provided level 2/3 support for 20+ hosted clients.

BNP Paribas logoBP

Proxy / Reverse Proxy Engineer

BNP Paribas

Dec 2016 - Dec 2017 (1 year)

Sole referent for F5 BIG-IP (VIPs, SSL/TLS, iRules) and WAF tuning across 50+ business applications. Handled 100+ URL-filtering requests with zero-incident production deployments.

IN

Network / Security Engineer

Intrinsec

Aug 2015 - Dec 2016 (1 year 4 months)

Deployed dedicated FortiGate firewalls in a multi-tenant data center for 30+ clients. Managed VLAN/VPLS across 3 data centers, BGP/OSPF, and Juniper CPE, with on-call rotation.

Education

Degrees, certifications, and relevant coursework

Cisco logoCI

Cisco

CCNP, Networking

2016 - 2019

CCNP certification from Cisco, completed between 2016 and 2019.

ET

ETNA

Master's degree (BAC+5), Network, System Architecture & Security

2016 - 2018

Master's degree (BAC+5) in Network, System Architecture & Security from ETNA, Ivry-sur-Seine, 2016–2018.

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