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Constyl DuvalCD

Constyl Duval

Fullstack Web & Mobile Developer

€300/day
Les Pavillons-sous-Bois, FR
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Constyl

Hello and welcome to my profile!

As a passionate software engineer, I help companies design robust and high-performing digital solutions. My approach goes beyond just code: I bridge the gap between technical innovation and your business objectives.

From designing microservices architectures and optimizing financial systems to developing intuitive mobile applications, I am committed to delivering reliable, secure, and scalable products.

What I can do for you:

- Fullstack & Mobile Development: End-to-end creation of Web and Mobile applications (Front, Back, API).

- Architecture & Performance: Designing systems capable of handling high loads (Scalability, Dockerization).

- Digital Transformation: Automating complex processes and integrating intelligent features (AI/Data).

My technical expertise:

- Backend: Python (FastAPI, Django, Flask), Java (Spring Boot), PHP (Laravel, Symfony), C# (.NET), Node.js(Fastify, Expess).

- Frontend & Mobile: Angular, React, Node.js, Flutter.

- Data & DBMS: PostgreSQL, MySQL, MongoDB, Oracle, SQL Server.

- DevOps: Docker, CI/CD, Cloud Deployment(AWS, GCP).

Beyond the technical aspects, I bring methodological rigor (Agile/Scrum) and an analytical vision to transform your complex challenges into sustainable software solutions.

Let's discuss your project!
  • French

    Native or bilingual

  • English

    Native or bilingual

Can work on-site
Les Pavillons-sous-Bois (up to 50km)

Experience

  • ICAM GRAND PARIS SUD
    Full Stack Software Engineer | Web & API Development
    MEDICAL
    January 2025 - June 2025 (5 months)
    Lieusaint, France
    • Implementation of the initial web application drivenby AI (FastAPI/Angular)and design of a scalable microservices architecture, optimizing the efficiency of hospital workflows.
    • Architecture and deployment of a multi-platform mobile application for patients **(React Native/FastAPI/MongoDB)**, enabling autonomous treatment management through intelligent assistance.
    • Development of a cross-platform mobile application(Flask/Flutter)for post-operative medical communication, integrating a third-party SDK foreye-trackinganalysis of responsiveness.
    • Creation of an internal web tool(FastAPI/Angular)for centralized management of staff schedules and leave, significantly improving administrative productivity.
    • Optimization of system responsiveness by implementing adistributed Redis cachelayer, reducingAPI latency by over 200ms.
    • Design and maintenance ofasynchronous data pipelines (Celery)for batch processing of medical data, enabling near real-time analysis and reporting.
    • Securing services through the implementation of advanced protocols(JWT, OAuth2)and standardizing deployments using Docker containerization for all backend and mobile services.
    • Steering strategic alignment through facilitating weekly project meetings and writing comprehensive technical documentation and scientific articles.
    JWT Redis Celery OAuth2 Artificial Intelligence
  • SOCIÉTÉ GÉNÉRALE CAMEROUN
    Backend & Database Developer (SQL)
    BANKING AND INSURANCE
    September 2023 - January 2024 (4 months)
    Douala, Cameroon
    • Design and security of a full-stack web application(PHP Laravel/SQL Server)for centralized authorization management, efficiently processing over 50,000 daily transactions.

    • Development and deployment of a critical application inC# ASP.NET Corefor automating the processing of bank files, significantly reducing manual errors and processing times.
    • Implementation of enterprise-level access control through a robust authentication system based onActive Directoryfor all internal applications.
    • 40% reduction in critical financial report execution time throughSQL Server stored procedure optimizationand database schema redesign.
    • Improved operational team efficiency by automating key business processes through the development and deployment ofVBS and PowerShell scripts.
    • Streamlined project communication by facilitating weekly progress meetings and ensuring high adoption through organizing training sessions for end-users.
    • Improved system maintainability and reduced future bugs through refactoring legacy code by applyingSOLID principles.
    SOLID principles Active Directory VBScript Project Management Powershell
  • LA SONARA (Raffinerie de Pétrole)
    Full Stack Developer | Functional Analysis
    RAW MATERIALS INDUSTRY
    January 2023 - April 2023 (3 months)
    Limbe, SW, Cameroon
    • Led the end-to-end design and development of an IT asset tracking systemin Python Django, compliant with ISO 9001and used by over 500 employees.
    • Accelerated analytical query performance through the modeling and optimization of thePostgreSQL database schema (materialized views and strategic indexes).
    • Standardized and orchestrated the multi-service application ecosystem(App, DB, Cache)throughDocker containerization and Docker Compose configuration management.
    • Deployed an interactive dashboard providing real-time data visualization and key performance indicator (KPI) tracking.
    • Ensured operational continuity by managing and resolving Level 2 Helpdesk support tickets, providing quick solutions to user technical incidents.
    • Collaborated with department heads to translate complex business needs into clear functional and technical specifications.
    Docker SCRUM Agile Methodology Practice Cache ISO 9001 Kubernetes

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Education

  • Specialized Master
    Icam Strasbourg-Europe
    2026
    Mastère Spécialisé
  • Computer Engineering Degree
    L'Institut UCAC-ICAM
    2025
    Cycle Ingénieur Informatique

Skill set

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