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Walt L.WL

Walt L.

Software Architect & Platform Designer

€600/day
Lille, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Walt

Software architect and senior consultant with over 30 years of IT experience. Expertise in modular architectures, microservices, and event-driven systems. Proven experience as a decision-making architect on complete technical scopes, with the ability to code, prototype, and validate choices through practice. Recently integrated AI/LLM technologies (RAG, embeddings, local LLMs). Available for assignments in Belgium, Hauts-de-France, and remotely.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Lille (up to 50km), Bruxelles (up to 50km)

Experience

  • Nexinet
    Software Architect & Platform Designer
    SOFTWARE PUBLISHING
    January 2018 - January 2026 (8 years)
    • • Complete design of a modular platform's software architecture: definition of the client-server model, choice of exchange protocols (JSON/XML), server sizing for scalability.
    • • Microservices architecture: design of a set of decoupled PHP services (read/write), standardized exchange protocols, exposure via AJAX API.
    • • Design of an event-driven messaging system (EventManager.js): inter-component publish/subscribe, complete decoupling between modules, Observer pattern applied to the entire UI.
    • • Data access layer abstraction: complete encapsulation of DB functions (connection, SELECT, INSERT…) allowing for DBMS changes without application impact. Repository/DAO pattern.
    • • Modular architecture based on specialized singletons: ProcessManager (routing and rendering of pages described in the database), state manager (inter-page state machine), graphics representation manager.
    • • Design of a cross-platform mobile abstraction layer: native Android (Java) and iOS (Objective-C) foundations exposing a unified JavaScript API for resource access (camera, files, notifications), eliminating business code duplication.
    • • Security: authentication token system, anti-SQL injection procedures, service isolation.
    • • AI/LLM Integration: RAG system (ChromaDB, Ollama embeddings, Mistral local LLM) for intelligent automation.
    • • CI/CD, Linux Ubuntu server administration, Apache, MySQL, Firebase (FCM), App Store & Google Play publication.
    Technologies: PHP, JavaScript, Java, Objective-C, MySQL, Apache, Linux Ubuntu, Firebase, Python, ChromaDB, Ollama
    Linux JavaScript, HTML5, CSS3, PHP, MySQL Event-driven architecture Web Development MySQL
  • Avantage Production
    System Architect & Developer – Production Supervision
    January 2017 - January 2018 (1 year)
    • • Design and implementation in full autonomy of a real-time industrial production supervision system, as a decoupled layer on top of an ITPAM PLC (CA).
    • • Decoupled architecture: abstraction of the ITPAM database to ensure longevity against source product evolution. Definition of exchange protocols (XML), API design (microservices).
    • • Real-time visualization on a graphical timeline of application processes, with an ergonomic alert system, SMS/email notifications, and filtering by user profile.
    • • Complete infrastructure: LAMP server implementation, architecture definition, autonomous deployment.
    Technologies: PHP, JavaScript, jQuery, C, C++, Linux, Apache, MySQL, SQL Server, XML
  • NDL | Entrepôt logistique automatisé (Carrefour France Textile)
    IS Manager – Technical Leadership & Architecture
    January 2002 - January 2007 (5 years)
    Gamm vert, Moyvillers, France
    Managed a team of 12 people organized into Operations, Development, and Integration units.
    • • Design of an asynchronous messaging system (MQSeries type): each barcode scan generates a message stored in a queue, consumed cyclically to provide real-time tracking of receptions and shipments. Event-driven / message queue pattern.
    • • Decoupled supervision architecture: a parallel system to the existing Oracle/SCHERZO database, designed to provide operational staff and business users (Carrefour) with real-time indicators (progress, incidents, stocks) without impacting the source system.
    • • Negotiation and management of projects outside the initial contractual scope: joint specifications with Carrefour, technical specifications, cost estimation, and delivery monitoring.
    • • Active participation in ISO 9001 and 14001 certifications, budget validation, HR management.
    Technologies: Unix/Linux, Oracle, MySQL, PHP, PL/SQL, Thales/Crisplant conveyor systems

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Education

  • Master II in Computer Engineering
    Diplômé Master II Ingénierie Informatique.
  • Master II in Science & Technology
    VAE
    2007
    Master II Sciences & Technologies

Skill set

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