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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.

Rigorous Curious Problem Solver Team Player

Experience

Systems Engineer & Software Engineer

Horizon Trading Solutions Sep 2024 - Present
Paris, France

• 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

Lead Developer

CreditBPO Jul 2022 - Dec 2023
Philippines

• 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

Freelance Sep 2015 - Jan 2022
Lyon, France

• 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

Senior Full Stack Web Developer

C Estates Inc Feb 2020 - Apr 2020
Manila, Philippines

• 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

Mostra Tirages d'Art Jul 2016 - Dec 2016
Grenoble, France

• 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

EverCleanCar Ltd Jun 2015 - Dec 2016
Lyon, France

• 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)

Lycée Polyvalent Corneille Sep 2024 - Jun 2026
La Celle-Saint-Cloud, France

Apprenticeship.

Software Engineering & Computer Science Curriculum

Ecole 42 Sep 2017 - Jun 2019
Lyon, France

Software engineering, C application development, web development, Linux system administration.

Digital Project Management (Coursework)

L'École LDLC Sep 2015 - Jul 2017
Lyon, France

Bachelor coursework: programming, web marketing tools, digital communication strategy, project management, business development, entrepreneurship.

BSc Coursework in Business Intelligence & Econometrics

Université Lyon 2 Sep 2014 - Jun 2015
Lyon, France

First-year coursework (Licence Informatique Décisionnelle et Econométrie Appliquée).

French Baccalaureate (Economics & Math Spec)

Kuala Lumpur, Malaysia

International high school diploma.

Skills & Technologies

Technical

Python
PHP
Laravel / Symfony
Vue.js
Astro
Linux (Debian/RHEL)
Windows Server
Powershell
Bash
Docker
Ansible
Nginx / Keepalived
Active Directory / LDAPS
Jenkins / CI
SonarQube
Artifactory
Azure
Zabbix
MySQL & PostgreSQL
Redis
TDD / Selenium
Git

Soft Skills

Agile / Scrum
Technical Mentorship
Architecture & DevSecOps
Code Review
Critical Incident Management

Certifications

Interests

Recommendations

[William] consistently delivered high-quality code and demonstrated a deep understanding of both front-end and back-end technologies. His problem-solving skills and dedication to meeting deadlines make him an asset to any development team.
Ronak Koya

Ronak Koya

Project Manager at Bacancy

Apart from his technical expertise, [William] is helpful to juniors and mentors them freely. An honest person, open for feedback and criticism. Overall a very solid team player and team leader.
Cedrick Rey Lariosa

Cedrick Rey Lariosa

Product Analyst at Med-Metrix

I often relied on his expertise to navigate and resolve complex technical challenges... What sets William apart is not just his technical proficiency but also his approachability... ensuring that our clients received prompt and effective solutions.
Almon Joyce Herodias

Almon Joyce Herodias

Account Manager at Oracle NetSuite

His exceptional skills and dedication were evident in his role on our project, contributing significantly to its success. A true asset to any team.
Jitendra Oza

Jitendra Oza

Software Engineer at ScaleTech Solutions

Selected Projects

E5 Synthesis Table
Bursar Office Management System (SGI)
BTS SIO E6

Bursar Office Management System (SGI)

"Supply order requests" module

H3 Release Checker
BTS SIO E6

H3 Release Checker

Tool for automating pre-release checks of the H3 software.

Deployment of the SGI application on Windows Server 2025

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

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

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.

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