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William Blondel
Senior Full-Stack Developer / Security Engineer
I am an experienced Full-Stack Web Developer with a passion for software design and DevOps. I specialize in building robust solutions from the ground up and leading development teams to solve complex technical challenges. Whether it’s architecting new systems or optimizing existing ones, I combine technical know-how with strategic thinking to deliver software that exceeds expectations.
Experience
• Systems Engineering: Implemented High Availability (HA) Nginx reverse proxy architecture using Keepalived and VRRP • Security/Identity: Directed the global migration of infrastructure services (Jenkins, Artifactory, SonarQube) to secure LDAPS/Active Directory via SSSD • IT Operations: Supervised major Linux OS upgrades (Ubuntu, Debian, Rocky Linux), storage expansion (LVM), and monitoring capabilities (Zabbix) • CI/CD: Maintained and administered complex continuous integration and delivery pipelines • Software Engineering: Developed internal automation tooling
• Reduced critical daily application exceptions from 4,000 to 0 • Improved application rating report generation speed by over 110x • Upgraded legacy code base from Laravel 5.7 to 10 • Managed infrastructure migration from Digital Ocean to Azure • Educated junior developers on best practices and conducted technical interviews
Full Stack Web Developer & Linux SysAdmin
• Developed websites with Python (Django) and PHP (Laravel, Symfony, CakePHP) • Built front-ends using Vue, Angular, Tailwind, Element Plus • Set up CI/CD pipelines (GitHub Actions, BitBucket Pipelines, Jenkins) • Managed Linux servers, Docker containers, and databases (MySQL, PostgreSQL) • Practiced Test Driven Development with PHPUnit and Selenium
• Developed new features (PHP with Yii2 Framework, MySQL, Redis) for a fractional real estate platform • Optimized static assets and improved browser compatibility • Set up continuous deployment workflow and configured servers to improve security
CTO Growth-hacker
• Executed lead generation and Info Scraping using custom Python scripts (BeautifulSoup, XPath, OAuth) • Managed PrestaShop platform, implemented Google Analytics, Tag Manager, and Mixpanel • Improved accessibility and SEO strategies
Co-founder & Web Developer
• Co-founded an eco-friendly mobile car cleaning service • Architected and developed the MVP web platform using CakePHP and Bootstrap • Designed MariaDB database and integrated PayPal API processing • Implemented Test Driven Development (TDD) via PHPUnit and Selenium
Education
BTS SIO specialized in Software Solutions (SLAM)
Apprenticeship.
Software engineering, C application development, web development, Linux system administration.
Bachelor coursework: programming, web marketing tools, digital communication strategy, project management, business development, entrepreneurship.
BSc Coursework in Business Intelligence & Econometrics
First-year coursework (Licence Informatique Décisionnelle et Econométrie Appliquée).
French Baccalaureate (Economics & Math Spec)
International high school diploma.
Skills & Technologies
Technical
Soft Skills
Certifications
- Junior Cybersecurity Analyst Career Path
Cisco • March 2026
Course Details - SecNumacadémie
ANSSI • 29/05/2025
Course Details - Python Programmer Track (end of 2023 version)
DataCamp • November 2023
Course Details - Career Essentials in GitHub Professional Certificate
GitHub • 02/11/2023
Course Details - Prepare for the GitHub Foundations Certifications
LinkedIn • 30/10/2023
Course Details
Interests
- Genealogy & History (family tree of 23,000+ individuals)
- Tech & Science Literature (Hacker News, daily.dev, Phys.org)
- Hiking & Mountain Biking
Recommendations
Selected Projects
Bursar Office Management System (SGI)
"Supply order requests" module
H3 Release Checker
Tool for automating pre-release checks of the H3 software.
Deployment of the SGI application on Windows Server 2025
Personal challenge: bringing the SGI application into production on Windows Server 2025 via WSL2, Docker Swarm and ServerSideUp Spin.
Static archiving of a Jira instance
Migration of a legacy Jira 3.13 instance to a static, browsable, searchable HTML archive protected by Microsoft Entra ID SSO.
Professional portfolio
Bilingual (FR/EN) static site serving as a BTS SIO portfolio and a technical blog. Designed, developed, deployed, and maintained independently.
Contact Me
I am always open to discussing new opportunities, exciting projects, or simply chatting about tech.