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Mehdi RejabMR

Mehdi Rejab

Frontend Lead React — AI & LLM Products

€689/day
Poissy, FR
8-15 years
React.js
JavaScript
TypeScript
Next.js

Average response time: 1 hour

Freelancer profile translated to English.
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About Mehdi

Frontend Lead with over 10 years of experience in React and TypeScript. Specializing in the architecture of complex business applications and AI products based on LLMs. Recent experience with conversational platforms, RAG systems, and large-scale document automation tools within BNP Paribas CIB.

KEY ACHIEVEMENTS
  • Development of the internal BNP CIB ChatGPT (genFactory)
  • Implementation of RAG and LLM interfaces in production
  • Design of over 50 reusable UI components (Hubside)
  • Frontend lead on several strategic AI products for CIB
  • 10+ years of React experience in banking and SaaS environments

EXPERTISE
  • Generative AI Products (LLM, RAG, Agents)
  • Frontend Architecture & Technical Decisions
  • Design System & Ownership
  • Technical Leadership & Coaching
  • Web Performance & Observability
  • Accessibility & Software Quality
  • Testing & CI/CD Industrialization
  • Team Support & Best Practices
Software Publishing

  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • BNPPARIBAS CIB
    FRONTEND LEAD REACT / AI – BNP PARIBAS CIB
    SOFTWARE PUBLISHING
    June 2023 - June 2026 (3 years)
    Paris, France
    Frontend Lead React for BNP Paribas CIB's internal AI products, used by numerous business teams. My role covers technical framing, architectural decisions, definition of frontend standards, and UX guidance for generative and document extraction products.

    🟣 genFactory — Internal BNP CIB ChatGPT
    • Design and development of the multi-session conversational interface (history, context, user metadata)
    • Implementation of real-time LLM response streaming (SSE), reducing perceived latency by several seconds
    • RAG integration with display of citations and sources in modular React components
    • Contribution to POCs around semantic classification and AI workflows, in coordination with data and backend teams

    Technologies: React, TypeScript, React Query, LLM, RAG, SSE, Sentry, Docker, GitLab CI

    🟣 docFactory — Automated Document Data Extraction
    • Development of the analysis and extraction interface for PDFs, images, contracts, and tables using dedicated AI models
    • Interactive visualization of extracted areas (highlight, overlay, before/after comparison), significantly reducing document validation time
    • Delivery of the complete workflow: import → prediction → human validation → export (JSON, Excel)
    • Optimization of rendering on heavy multi-page documents to maintain a fluid UI
    • Participation in defining the shared data model between frontend and extraction models

    Technologies: React, TypeScript, React Query, OCR, AG Grid, Sentry, Docker
    React.js TypeScript Next.js JavaScript LLM
  • HUBSIDE
    Frontend Lead React/TypeScript
    SOFTWARE PUBLISHING
    October 2019 - May 2023 (3 years and 7 months)
    Paris, France
    Frontend Lead within a team responsible for a SaaS platform for creating websites for individuals and professionals. Definition of development standards, technical support, code reviews, and dissemination of best practices within the team.

    • Design and delivery of over 50 reusable UI components (WYSIWYG editor, galleries, dynamic forms) at the core of the platform
    • Scalable frontend architecture: modularization, code splitting, and performance optimization on critical user journeys
    • Management of the design system (Storybook + Chromatic) and industrialization of visual tests, reducing UI regressions in production
    • Implementation of unit and functional tests (Jest, React Testing Library) on key user journeys
    • Application observability and production error tracking (Sentry)

    Technologies: React, TypeScript, Redux, Next.js, Node.js, Storybook, Chromatic, Sentry, Git
    React.js Next.js TypeScript JavaScript Node.js
  • BNP Paribas Partners for Innovation (BP2I)
    Frontend Developer React
    SOFTWARE PUBLISHING
    October 2018 - September 2019 (11 months)
    Île-de-France, France
    Frontend development within a team responsible for the redesign of the internal infrastructure management portal for the BNP Paribas group.

    • Design and development of React components (Hooks, React Router v4)
    • State management with Redux on high-stakes business journeys
    • Jest / snapshot test coverage to ensure reliable deliveries
    • Performance and build pipeline optimization (Webpack, Babel)
    • Daily collaboration with backend teams

    Technologies: React, Redux, JavaScript ES6+, Jest, Webpack, Babel, React Router v4, Git
    React.js JavaScript HTML5/CSS3
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Education

  • Engineering degree in Computer Science, Distributed Systems Engineering
    National Engineering School of Sousse
    2016
    Diplôme d'ingénieur en informatique, Ingénierie des Systèmes distribués
  • University Diploma of First Cycle Studies (DEUPC), Mathematics-Physics (MP)
    Preparatory Institute for Engineering Studies of Tunis (IPEIT)
    2013
    Diplôme des Études Universitaires de Premier Cycle (DEUPC), Mathématiques-Physiques (MP)

Skill set

Node.js
HTML5/CSS3
Git
Agile Method

Categories