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David MatheDM

David Mathe

Full-Stack JS Engineer | AI & RAG Expert

€600/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About David

🚀 From POC to Production: I industrialize your Generative AI applications on the Cloud.

Full-Stack JS Engineer, I work at the intersection of modern interface development (React/Next.js) and AI architectures on Google Cloud Platform (GCP).

My goal: to connect LLMs to your internal data securely, efficiently, and scalably.

💡 MY AI & CLOUD EXPERTISE:
• LLM Orchestration: Deployment and management via Vertex AI (Gemini, Claude, Llama).
• RAG (Retrieval-Augmented Generation) Architectures: Secure connection to enterprise data with vector databases (pgvector, Vertex AI Vector Search).
• Workflows & Automation: Automation of complex business processes using n8n and Node.js scripts.

💻 MY PREFERRED STACK:
• AI / Cloud: GCP, Vertex AI, OpenAI / Anthropic APIs
• Backend & Data: Node.js (Express, NestJS), PostgreSQL (with pgvector), Docker
• Frontend: React.js, Next.js, Tailwind CSS

Available immediately to accelerate your AI and Cloud projects. Let's discuss your needs during an initial chat!
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Projet Reach
    Full-Stack & AI Developer (React Native / Node.js)
    SOFTWARE PUBLISHING
    October 2025 - Today (8 months)
    Paris, France
    Conception and development from scratch of Reach, an innovative cross-platform (Web & Mobile) matching application, powered by an AI multi-agent system.

    Technical Missions and Achievements:

    • Frontend Architecture (React Native & Web): Development of the mobile application (iOS/Android via Expo) and the web interface. Creation of fluid User Interfaces with real-time messaging integration (StreamChat) and advanced UX management (animations, keyboards).
    • Backend Development (Node.js): Design of a robust and modular REST API with the Fastify framework and TypeScript. Integration of Auth0 for securing user profiles.
    • AI & LLMs Integration: Orchestration of generative Artificial Intelligence models via OpenRouter. Creation and fine-tuning of complex prompts to control the behavior of multiple conversational agents.
    • Data & Vector Database: Advanced PostgreSQL database modeling (Multi-schema JSONB). Design of an internal matching engine based on semantic search using vector embeddings (pgvector extension).
    • DevOps & CI/CD: Containerization of the Backend and DB infrastructure with Docker. Configuration of build and publication pipelines on the stores (App Store, Google Play Store) via EAS (Expo Application Services).
    A complete project requiring strong end-to-end technical mastery, from the data infrastructure (vector databases) to deployment on end-user phones.
    React Native PostgreSQL Node.js Docker LLM
  • Adeo
    Full-stack JS Developer
    RETAIL (SMALL BUSINESS)
    December 2022 - December 2025 (3 years)
    Lille, France
    • Frontend Development & Internationalization: Creation of a multilingual customer interface deployed in five European markets.
    • API Integrations & Data Flows: Integration and complex management of data flows from multiple external APIs.
    • Performance & Reliability: Application monitoring, production incident management, and implementation of continuous optimizations (response time and stability).
    • DevOps & CI/CD: Management of application deployment processes and version control (Git) across all staging and production environments.
    • Big Data Processing: Development of large-scale file import scripts (XLSX, CSV) incorporating fault-tolerant parsing and robust validation logic.
    • Asynchronous Architecture: Orchestration of asynchronous communication via Kafka to manage high-volume data pipelines.
    Scrum Database Management Front-end Interface Development Node.js Kafka
  • Humans Matter
    Tech Lead Frontend
    EDUCATION AND E-LEARNING
    May 2021 - December 2022 (1 year and 7 months)
    Paris, France
    • E-commerce Platform & UX: Development of a high-performance e-commerce platform, strongly focused on user experience and conversion rate optimization.
    • Frontend Development (React.js): Creation of reusable UI components using React Hooks, in strict accordance with design specifications (Figma/UI).
    • SEO Optimization: Advanced integration of SEO best practices into the core of the application (SSR/SSG, markup, web performance) to ensure optimal visibility and ranking.
    • Cloud Architecture (AWS): Design and deployment of a highly scalable serverless architecture leveraging the AWS stack (AppSync, Amplify, S3, and Kinesis).
    • Responsive & Adaptive Design: Implementation of interfaces perfectly adapted across all platforms (Desktop, Tablet, Mobile).
    • Software Quality & Testing: Rigorous implementation of unit and integration tests to ensure code stability, non-regression, and long-term maintainability.
    React.js AWS Cloud Typescript Chat Messaging Digital Transformation

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Education

  • ECOLE 42
    EC English School
    2017
    ÉCOLE 42

Skill set

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