Freelancer profile translated to English.
Back to original languageAbout Pierre
Hello, I'm Pierre Halloo, a fullstack web developer based in Amiens. With several years of experience, I design robust, scalable, and custom web applications, focusing on code quality and performance.
My approach is based on autonomy, curiosity, and the ability to adapt quickly to the specific needs of each project. Whether you are an innovative startup, a growing SME, or an agency looking for technical support, I am committed to delivering effective solutions, on time and with complete transparency.
If you are looking for a reliable, responsive, and passionate partner to move your digital projects forward, do not hesitate to contact me. I would be delighted to discuss with you.
French
Native or bilingual
English
Fluent
Can work on-site
Amiens (up to 50km), Paris (up to 10km), Lille (up to 10km)
Experience
- PlaygrooundDesign, development and deployment of the SaaS playgroound.ioSPORTSDecember 2025 - March 2026 (3 months)Lille, FranceComplete autonomy in the creation of a SaaS platform dedicated to diagnosing workplace well-being, mental health, and team engagement through dynamic questionnaires.The solution allows for analysis of results and triggering targeted actions (seminars with top athletes) to address identified issues (cohesion, performance, stress management).Role & responsibilities
- End-to-end project management (architecture, development, production deployment)
- Design of a scalable and maintainable SaaS architecture
- Front-end in React
- Back-end in Python with Litestar (REST API)
- Admin space in Vue.js
- Design of a versioned questionnaire system (scalable and historized)
- Integration of mockups + client UX/UI support
- Containerization with Docker and cloud deployment
- PostgreSQL database
- Implementation of monitoring, logging, and unit tests
Results- Live and operational product
- Decision-making tool for companies on HR issues
- Robust architecture allowing for continuous evolution
- SOCOTECFull stack developerREAL ESTATENovember 2021 - August 2025 (3 years and 9 months)Lyon, France*Development of softwarefor controlling atmospheric emissions with afront-end firstapproach. Creation ofPython architecturesto manage data entered into logbooks, process them in spreadsheets, and detect deviations from standards. The project was successfully delivered in one year, with synchronization of front-end and back-end databases, while respecting user performance requirements.*Migrationof report generation code from an application to a micro-service, transferring reports to the micro-service's database, without service interruption or regression.*Import scriptfor data from 500,000 buildings from several Socotec software into a microservice.Data processingof location data using aKDTree algorithmto eliminate duplicates and maintain a clean database. Optimization of the script for fast execution: 30 minutes instead of the initial 8 hours.
- Design of astateless orchestratorusing theSAGA patternto synchronize operations between multiple applications and micro-services. A compensation system ensures the atomicity of operations in case of task failure, thus guaranteeing data consistency.
- **Audit and backend architecture redesign**, with a proposed migration plan and implementation of a first microservice on the new architecture.
*Development of features(back and front) on various group applications. - Snake interactive
On Malt
Front-end developerDIGITAL AND ITJuly 2025 - July 2025Amiens, FranceComplete development of a front-end only showcase website composed of five pages: home, registration/unregistration form, legal notice, and data usage terms. The project was entirely created from scratch for a web agency that wanted a reusable site base for its final clients.As the client only provided a functional mockup without a graphic direction, I took the initiative to define the entire interface and user experience. I designed a simple and elegant design in line with their expectations, structuring the pages around a coherent graphic charter (heading hierarchy, text styles, buttons, spacing, colors, responsive design, etc.). I also designed the entire navigation menu as well as the mobile and tablet interfaces.The entire HTML, CSS, and JavaScript code was organized clearly and modularly, allowing for easy reuse in various contexts without risk of graphic or functional breakdown. Regular exchanges allowed for validation of interface choices, and I took care to document and explain my choices to ensure the project's scalability.
Reviews
Maureen
Gérante - Maison Paul
Reviewed on 5/18/2026
I hired Pierre to create my e-commerce site, and I am fully satisfied with the result.
From the beginning, he understood my needs precisely and proposed a solution truly adapted to my target audience and goals. What particularly struck me was his ability to make the technical aspects accessible: the exchanges were clear, we understood what we were approving, which built a real relationship of trust.
The delivered work is of high quality, meticulous, and the deadlines were perfectly met. His personalized advice, always linked to my business and target audience, helped me make the right choices throughout the project.
I recommend him without hesitation.
D
Daniel
Directeur - Snake interactive
Reviewed on 3/24/2026
Great collaboration with Pierre
Smooth, clear and fast communication
Fast, high-quality and masterfully precise execution
I recommend him to everyone, it's a pleasure to work with Pierre
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Education
- DUT informatiqueIUT Amiens2017
- Ingénieur informatiqueCNAM2020