Freelancer profile translated to English.
Back to original languageAbout Jerome
Linux, CybersecurityandDevSecOpsexpert, I help organizationssecure**, **optimize**, and **industrialize**sensitive or critical environments**. I handle everything fromauditstoproduction deploymentandoperations**, focusing on **system and web hardening**, **CI/CD, operational automation, vulnerability management, monitoring, backups/DRP**, and **Linux administration**. Particular expertise in **certificate lifecycle management (TLS/PKI)**, **application platform operations**, and integration around **databases and APIs**. I also undertake **targeted development**: **internal tooling, custom scripts and automation, API integration, application patches**, or **small technical components**. Accustomed to contexts with high constraints on **availability, traceability, and compliance**, including for **sensitive data**. Possible entry point: **MonAideCyber diagnostic+ report +action plan**, followed by support for **implementationand **remediation**.
French
Native or bilingual
English
Fluent
Spanish
Basic
Can work on-site
Niort (up to 15km), Paris (up to 15km)
Experience
- Prestataire de services de confiance qualifié eIDAS du groupe DocaposteSRE / DevSecOps Engineer – Linux, CI/CD, Certificates and HardeningSOFTWARE PUBLISHINGApril 2023 - December 2025 (2 years and 8 months)Paris, FranceWithin theCryptography SREteam, I was responsible for themaintenance in operational condition (MCO)**, **security**, and **industrializationof critical PKI and application platforms in GNU/Linux environments with high availability, traceability, and compliance requirements.My scope included:
- MCO of PKI and Java application platforms: EJBCA, Tomcat, WildFly, upgrading Java 8 Oracle to Java 21 OpenJDK/JRE
- Linux Migration: CentOS to AlmaLinux/Oracle Linux, automating system updates and tracking via Jira ticketing
- Implementing GitLab CI/CD with QA, testing, security, SBOM, and secure backup phases
- Cyber threat intelligence and security remediation: analyzing CVEs in production and pre-development, handling false positives, system and application hardening, remediating audit findings
- Certificate lifecycle management: generating, converting, and deploying certificates (CER, PEM, etc.), TLS rotation, RSA to ECC migration, automated validation of CRLs
- Fixing the Java SDK for interfacing with the EJBCA REST/SOAP API and providing support for PKI usage
- Deploying and configuring HSM components (Proteccio) and securing web cryptographic configurations
- Database administration and optimization: MariaDB cluster, PostgreSQL upgrades, and writing/executing SQL patches
- Observability and operations: logrotate, syslog, auditd, monitoring, log analysis, defining metrics probes, automated reporting, Grafana dashboards
- Operational automation using Bash, Ansible, cron, and Jira API, aiming to reduce manual interventions and improve replayability
- Supporting deployment of PHP/Laravel applications, maintaining web components, deploying Go/Python services
- Technical documentation, diagrams, architecture proposals, and coordination with development, compliance, SOC, and operations teams
- Sages incWordPress Restoration after Compromise (Showcase Site) – Corrective MaintenanceVIDEO GAMES AND ANIMATIONDecember 2024 - December 2024Niort, FranceRestoration of acompromised WordPresssite (malicious actor) with the goal of returning it as close as possible to its original state. Intervention scope based on **backup availability and compromise level**: diagnosis, restoration, cleanup, relaunch, followed by maintenance catch-up (core/plugin/theme updates, hardening, and access rotation).Correction ofsecurity vulnerabilities identified in the themeused (patches/code modifications) to remove re-intrusion vectors and stabilize the site. Report on actions taken + recommendations for preventive maintenance.
- CAIROSIoT Alarm Management Interface (LoRa / SIP) – CakePHP & PostgreSQLMEDICALAugust 2022 - June 2024 (1 year and 10 months)Niort, FranceDevelopment of aCakePHPweb application formanaging alarmsanddevicesfor elderly care monitoring. Design of amultilingual PostgreSQLdatabase, implementation of anauthentication system**, integration of **LoRa frame reception and processing(parsing/treatments), orchestration ofAPI callsto retrieve/exchange data, and alarm lifecycle management (creation, tracking, prioritization). TriggeringSIP calls (VoIP)to signal critical alerts. Dynamic front-end interface using **JavaScript**.
Reviews
Ludovic
GROUPE SCP
Reviewed on 9/1/2022
We entrusted a mission to Jérôme who proved to be very professional and attentive.
We highly recommend his WEB DEVELOPMENT services.
Thank you again,
See you soon
Dimitri
Beyond Gravity
Reviewed on 3/4/2020
Very satisfied with this start to our collaboration.
Jérôme is very responsive, competent, and professional. He regularly challenges the current solution to propose alternatives, thanks to his in-depth technical skills in many areas (Java, networks among others), as well as strong analytical skills.
He works with Estelle, who has been the main person developing this Java application so far, and we can say it's a great success: true to the specifications and mockups, perfectly functional from the start, all in complete autonomy. Nothing to say, I recommend.
Recommendations
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Master of Computer Science, Mathematics, Multimedia and Telecommunication, Specialization in Computer ScienceUniversity of Poitiers, France2016Formation en informatique traitant du développement de logiciels et d'applications web, et de la gestion de systèmes d’information. Première année de Master effectuée à l'université de Moncton, Canada. Contenu : - Ingénierie des données - Reconnaissance de formes (réseau de neurones, etc...) - Architectures Avancées pour le web N-Tiers (java, REST SOAP, docker) - Système temps Réel (c, xml, spécification et validation) - Systèmes experts : Clips - Programmation orientée objet : C++ - Architecture Matérielle - Base de Donnée : sql , PL / SQL - Système d'exploitation : C , GNU/Linux - Conception : UML ( VisualParadigm ), MVC2, singleton, factory - Algorithmie - Automates - Gestion de Projet - Économie - Anglais
- University Diploma: Skills Passport CreationUniversity of Poitiers, France2016Formation d'accompagnement à la création d'activité et à l’insertion professionnelle, en lien avec le statut d'étudiant-entrepreneur. Contenu : - Étude de marché - Méthodologie d’organisation - Stratégie Commerciale - Veille Stratégique - Innovation - Structure juridique et fiscalité d’entreprise - Économie sociale et solidaire - Compétences juridiques - Comptabilité et gestion - Étude prévisionnelle - Analyse financière - Communication - Utilisation des outils des internets - Recherche de financement - Constitution et maintien d’un réseau - Gestion des ressources humaines
Certifications
- Master in Computer ScienceUniversity of Poitiers2016
- Bachelor in Computer ScienceUniversity of Poitiers2014