Freelancer profile translated to English.

Description

Systems and security engineer passionate about GNU/Linux, I administer and secure a fleet of 90 Ubuntu servers daily. Among my notable achievements, I deployed an SMTP and IMAP email server based on Postfix and Dovecot, ensuring the confidentiality and reliability of communications, as well as a secure internet gateway using a Stormshield firewall, to effectively protect the network infrastructure.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Paris (up to 50km), Versailles (up to 50km), Rouen (up to 50km), Roubaix (up to 50km)

Pomelo-Paradigm
Information Systems Security Engineer
SOFTWARE PUBLISHING
June 2024 - Today (2 years)
Versailles, France
Developed a Bash script automating the deployment of the Pomdoc application on a three-tier architecture, integrating OS hardening measures and dynamic load balancer configuration. This script effectively integrated 17 GNU/Linux servers into the application node.
Replaced a third-party email system with a free and open-source solution, based on Postfix and Dovecot, to enhance communication confidentiality. The integrity and authenticity of emails were protected through SPF, DKIM, and DMARC, thereby reducing the risks of phishing and identity theft. Additionally, the implementation of an anti-spam system (Greylisting and DNSBL RBL) effectively filtered threats.
Deployed a secure gateway compliant with ANSSI guidelines, from defining the specifications to integrating firewalls. Configured a Stormshield firewall cluster with protocol break, enhancing network traffic analysis via an IPS (Intrusion Prevention System).
Stormshield Bash GNU/Linux Windows Server Jamf
Gatewatcher
Systems, Networks, and Security Engineer
SOFTWARE PUBLISHING
January 2024 - May 2024 (4 months)
Puteaux, France
Integration of the security system — Network Detection Response (NDR)
Analysis and optimization of system performance — Sar, Ksar
Firewall — Fortinet, Palo Alto
Writing documentation/Knowledge Base (KB)
Customer support
Bug reproduction and patch application
Monitoring - Syslog, Kibana, Netdata
Tools — Git, Docker, GNU/Linux, Suricata, LDAP, Nginx, PostgreSQL
Member of the internal SOC team
CFA Stephenson
Systems and Network Administrator
EDUCATION AND E-LEARNING
October 2019 - September 2022 (2 years and 11 months)
Paris, France
Administration of Ubuntu Server, RedHat, Windows Server systems
Administration of Cisco Meraki switches and Wifi access points via SSH and Telnet
Implementation of a virtual environment — Hyper-V, in cluster mode
Refactoring of firewall rules — Sonicwall
Automated processing of logs via Bash and Python scripts
Integration of monitoring systems — Nagios, Cacti, Nedi, Syslog, Graylog
Participation in the VLAN restructuring project and ACL definition
Definition of the backup strategy based on the ANSSI 3-2-1 rule
L2 and L3 user support

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Master, MSc Cybersecurity
ESIEE-IT
2022

OSCP, OffSec Certified Professional
Offensive Security
2023
https://www.credential.net/e807e336-e419-457d-919a-f1454231c218#acc.4xMJarKC
Information Gathering Privilege Escalation Password Attacks Web Exploitation Vulnerability Scanning Penetration Testing Antivirus Exploitation Kali Linux Antivirus Exploitation Exploitation

Sysadmin

Vithurshan S.

Systems and Network Administrator | Linux/Windows

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