Cloud · Networks · Cybersecurity · Automation

More secure
infrastructure.
More empowered teams.

Cloud Platform Engineer and cybersecurity engineer, focused on securing production environments and automating day-to-day operations.

Explore my experience Get in touch
Wignehies, France Open to conversations
Portrait of Lucas Defossez
Practical. Reliable. Useful.The right solution for the environment.
A cross-functional approach, from networking to automation Explore my skills

How I work

Technology that makes
everyday work better.

I like to understand the needs behind each request, rethink processes and build solutions that save time without adding unnecessary complexity.

From network operations to Python scripts, I work towards the same goal: making services safer, clearer and easier to maintain.

01 Improve security without slowing teams down 02 Automate repetitive work 03 Improve practices together

Professional experience

Hands-on experience.

From networking to cloud platforms, working in demanding environments with real production challenges.

Apr 2025 — Present

Cloud Platform Engineer

DECATHLON · Freelance · Lille, Hauts-de-France · Hybrid

01
  • Automated Wallix DRP workflows.
  • Set up reporting and alerting for the device PKI.
  • Built a FastAPI service to manage employees’ internet access and refactored the associated legacy frontend.
  • Maintained a DevOps container to support Ops teams who develop.
Cloud PlatformTerraformAnsibleKeyfactorDjangoWallixPKIFastAPIPython
Apr 2024 — Apr 2025

Cybersecurity and DevOps Engineer

IANORD · Freelance · Villeneuve-d’Ascq · Hybrid

02
  • Designed and deployed a complete office network, including firewalls, switches and wireless access points.
  • Rolled out security hardening with Ansible, including brute-force protections, firewall rules and SSH configuration.
  • Managed GDPR compliance and improved infrastructure while working towards ISO 27001 certification and SecNumCloud qualification.
  • Managed operations and maintenance for internal and external client infrastructure (Kubernetes and Windows Server), supporting production and continuous deployments of food-service management software for canteens and restaurants (Next.js/IIS).
Network DesignFirewallsSwitchingWireless Access PointsAnsibleSecurity HardeningGDPRISO 27001SecNumCloudKubernetesWindows ServerNext.jsIISContinuous Deployment
Nov 2020 — Jan 2024

Network Security Engineer

SNCF CONNECT & TECH · Permanent · Lille, Hauts-de-France

03
  • Built a certificate repository and AWS/on-premises infrastructure inventory, including cost tracking, expiration monitoring and anomaly tracking.
  • Automated checks, reminders, configuration changes and email notifications.
  • Led the frontend work for a service catalogue after reviewing business processes and introducing ITIL practices.
  • Operated and maintained network infrastructure, switches, routers, firewalls, VPNs and MPLS; maintained traffic-flow matrices.
InfrastructureAutomationITILAWS & on-premises
Aug 2019 — Nov 2020

Information Security Analyst

PICTIME GROUPE · Lille

04
  • Set up a secure analysis and attack lab.
  • Maintained systems within an ISO 27001 / HDS scope.
  • Automated recurring security tasks with Python.
  • Investigated incidents and risks, performed penetration tests and produced reports.
PythonISO 27001HDSPenetration testing
Oct 2017 — Aug 2019

Junior Systems Administrator

AXECIBLES · Lille

05
  • Developed an automated user onboarding and offboarding system.
  • Built email setup tools for Outlook, Thunderbird and iOS.
  • Created laptop deployment scripts and monitoring bots for printers and data consistency across databases.
Systems administrationScriptingUser support
Jun 2017 — Aug 2017

IT Technician

GERRESHEIMER

06
  • Provided daily support and maintenance and administered SAP ERP accounts.
  • Performed vulnerability testing (Petya, SMBv1), managed Dell TL2000 backups and deployed MS17-010 patches through WSUS.
  • Restored and migrated PCs with Norton Ghost.
IT supportBackupsWSUSSAP

Skills & technologies

A cross-functional skill set.

Systems, networking and security: bringing in the right skills for the job, without adding unnecessary complexity.

01 / INFRASTRUCTURE

Virtualization & containers

Designing and operating environments suited to their use cases.

ProxmoxVMware ESXiHyper-VDockerKubernetes
02 / SECURITY

Networking & firewalls

Network operations, traffic control and secure access.

Check PointPalo AltoFortinetpfSenseStormshieldNetasq
03 / AUTOMATION

Scripting & tools

Reducing repetitive work with simple, maintainable tools.

PythonBashAnsibleTerraformFastAPIDjangoGitLab CI/CDVaultJFrogJira
04 / SYSTEMS

Systems & development

Administering diverse platforms and understanding the software lifecycle.

CentOS / Red HatDebianUbuntuWindowsDOS / BatchC# / C++PHP · HTML · CSS · JS
Networking & protocols

Cisco · Juniper · HPE · Extreme Networks · BGP · MPLS · DHCP

Education

Keep learning,
then share.

Technical English — C1

Industries: retail & manufacturing

2019 — 2020

RNCP Expert in Digital Security

Aston · Lille

2017 — 2019

RNCP Systems, Network and Database Administrator

Aston · Lille

2015 — 2017

BTS in Digital Systems — IT and Networks

Jean Rostand · Roubaix

2014 — 2015

DUT in Electrical Engineering and Industrial Computing

IUT A · Lille · studies pursued

Let’s talk

A project to secure
or simplify?

I’d be glad to discuss your infrastructure, security or automation challenges.

Email me
Emailcontact@netsecforge.com LinkedInlinkedin.com/in/lucas-def
Location59212 Wignehies, France