Freelancer profile translated to English.
Back to original languageAbout Guillaume
Automation, Secure API Architectures & TDD
Launching, automating, or making a web project more reliable? I support you as a technical partner with a pragmatic, results-oriented approach focused on clarity and efficiency.
My goal: To translate your business challenges into concrete, ultra-performant, and automated architectures, without ever sacrificing security or long-term vision.
🚀 My Pillars of Intervention
Automation & TDD: Design of workflows and scripts (PHP/Python) fully covered by tests. Test-Driven Development is my guarantee of robustness for smooth deployments without regressions.
API Ecosystem & Tooling: Design of highly connected RESTful and GraphQL APIs. Mastery of modern stacks (CI/CD, Docker, monitoring).
Cyber Mindset (Security by Design): Your data flows are critical. I integrate the strictest security standards (OWASP, fine-grained authorization management, encryption) from the very first line of code.
Business Alignment & Management: With a hybrid profile (tech + project management), I communicate directly with your teams or clients to streamline delivery (specifications, agility, coordination).
🛠️ Technical Expertise & Methodologies
Developer for over 10 years (Start-ups, SMEs, Large Corporations), I shape clean, modular, and scalable architectures:
Back-end & Automation: PHP (Symfony — my preferred framework, Laravel, Phalcon), Python (automation, scripting, data).
Front-end & Fullstack: Modern ecosystems including Node.js, TypeScript, React/Next.js, and Vue/Nuxt.js for fluid interfaces.
Craftsmanship & Architecture: Hexagonal Architecture, DDD (Domain-Driven Design), TDD, API-first, SecOps, and rigorous documentation.
My method is simple: solid, tested, highly secure code, and clear communication at every step. Let's discuss your project!
French
Native or bilingual
English
Fluent
Spanish
Fluent
Can work on-site
Paris (up to 50km)
Experience
- Techne-LabBackend & Technical Lead DeveloperDIGITAL AND ITDecember 2024 - Today (1 year and 6 months)Paris, France
Techne Lab — IT Agency dedicated to the digital transformation of VSEs
- **Automation & TDD**: Design and automation of complex business workflows through a rigorous test-driven approach (TDD), ensuring code robustness and maintainability.
- API Architecture & Tooling: Modeling and development of robust RESTful APIs (Symfony), interconnected with a modern ecosystem of tools (CI/CD, Docker, monitoring tools) and Python automation scripts.
- Cyber Mindset & Security by Design: Native integration of security best practices (OWASP, fine-grained authorization management, encryption) to secure data flows and automations.
Business Projects & Achievements:
- Development of complex applications: Design and development of a custom Web application (Symfony) for an accounting firm, streamlining and automating client interactions.
- SecOps & Data Transfer: Implementation of a highly secure system for transferring and storing sensitive accounting documents.
- Planning & Business Logic: Integration and synchronization of calendar software via API for automation and planning of accounting exercises.
- Co-design & Business Approach: Direct collaboration with clients to translate their business processes into technical specifications and design software architectures perfectly aligned with their needs.
- ObatSymfony Back-end DeveloperCIVIL ENGINEERINGJune 2024 - December 2024 (6 months)Paris, FranceObatis an innovative startup offering invoicing management solutions for construction companies.As a member of the "Cash" team, I participated in the development and optimization of tools related to accounting and invoicing:
Main Missions
Transfer of accounting data to Pennylanevia theCHIFTAPI:- Optimization of exchanges with a Symfony response streaming solution.
- Advanced management of accounting flows, allowing me to deepen my mastery of accounting management.
**Advanced user features**:- Addition of tools allowing users to view costs and profitability per construction site.
- Multi-user management with specific roles: accountant, site manager, president, etc.
Architecture and quality
- Implementation of a hexagonal architecture on a PHP Symfony 6 and 7 base, with a multi-service breakdown.
- Adherence to a code coverage of at least 80%, checked with tools like Deptrac, PHPStan, and SonarCloud.
**Strict contracts**:- Contractual API between back and front, validated by contract tests.
- Internal contracts between backend services, ensuring the robustness of exchanges.
Results and impact
- Significant improvement in the performance and reliability of accounting data transfer.
- Enrichment of features for users, facilitating their business management and decision-making.
- Implementation of processes and tools guaranteeing code quality and long-term maintainability.
- EISF - EDLPTech LeadEDUCATION AND E-LEARNINGSeptember 2023 - Today (2 years and 9 months)Paris, FranceL’EISF and EDLPare organizations offering distance learning:- EISF specializes in CAP diplomas highlighting French know-how (pastry chef, baker, chocolatier).- EDLP offers training in photography, marketing, and web professions.As **Project Manager**, I supervised the technical management and evolution of both platforms:
Migrations and infrastructure:
- Migration ofSymfonyenvironments (2.3 → 6.4): rewriting key modules withautomated teststo prevent regressions.- Server modernization (**Debian** 8 → 11) and implementation ofPleskfor simplified infrastructure management.Automation and optimization:
- Optimization of thesales funnelto improve user experience.- Automation of subscription payments withDalenysand **Payplug**.- Implementation of automated management ofuser rightsand training access.- Automatic invoice generation with **Payum Be2Bill**, eliminating manual interventions.Integration and unification
- Unification of the two platforms via aFactory (Design Pattern)for centralized maintenance.- Integration ofHubSpotfor effective CRM management and lead tracking.Quality Guarantees
- Implementation ofquality control tools(PHPStan, SonarQube) to ensure robust code.- Use ofunit and functional tests(PHPUnit) and integration tests to validate each delivery.- Automation of deployments withCI/CDpipelines and environment standardization via **Docker**.This experience highlights my skills in managing complex technical projects, optimizing processes, and ensuring quality in demanding environments.
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Education
- Expert in Information TechnologyEpitech Paris2017Epitech est une école d'informatique suivant un cursus en 5 ans. Elle a pour vocation de former des experts en informatique, des innovateurs, de vrais dirigeants capables d’imaginer et de créer le futur de l’informatique et le meilleur de l’innovation. Grâce à une méthode pédagogique centrée sur le concret, les étudiants acquièrent des connaissances et des compétences en réalisant de nombreux projets, généralement en groupe. La formation permet d’accéder à des postes à responsabilités en France comme à l’international dans tous les secteurs de l’économie et dans tous les domaines technologiques comme la sécurité informatique, le big data, l’embarqué, l’intelligence artificielle.