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Julien KaeseryJK

Julien Kaesery

Expert AI Automation & Design System Architecture

€700/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

Founder of Flowo, I transform your complex processes into fluid and profitable systems. With 10 years of Full-Stack expertise (React, Node.js), I don't just deliver tools, I build your digital infrastructure.

**My 3 Areas of Intervention**:

1. AI Automation (n8n/Make/Vapi): Elimination of repetitive tasks. Average gain: 20% time freed up for your teams.

2. Web Conversion (Next.js/Tailwind v4): Ultra-high-performance websites with optimized booking funnels.

3. Enterprise Design System: Industrialization of your production via Design Tokens (W3C) to eliminate technical debt.

Why choose me?
- Zero intermediaries: You speak directly to the senior expert who produces.

- Sovereignty & GDPR: Mistral Large and self-hosted n8n expertise for your sensitive data (health, legal).

- Speed: Start in less than 7 days.

Ready to free up your teams' time?
Contact me for a free diagnosis.
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • PMV
    Infrastructure & Automation Lead
    PUBLIC SECTOR
    August 2025 - April 2026 (8 months)
    Paris 13 Gobelins, France
    Automation of business processes and integration of AI solutions into full-stack applications. – Automation of 5 critical business processes, generating an estimated operational time saving of 25-30% per quarter. – Design and deployment of autonomous AI agents via LangChain, LangGraph, and CrewAI — multi-agent orchestration in production. – Management of LLM contextual memory (short-term / long-term memory, vector stores) for intelligent business workflows. – Deployment of containerized solutions (Docker) with CI/CD pipelines; integration of AI solutions into Node.js/Python applications. – Technical documentation and skills transfer to the team on automation and AI integration patterns.
    React.js n8n Artificial Intelligence Docker Python
  • NielsenIQ
    Senior Full Stack Engineer & Design Lead
    AGRICULTURE
    December 2019 - January 2024 (4 years and 1 month)
    Bezons, France
    Lead Front-end & Design System Architect

    Objective: Industrialization of the interface and guarantee of software quality.
    - Design System Architecture: Design and deployment of a complete design system based on Design Tokens (DTCG) to ensure multi-platform consistency.

    - Technical Governance: Structuring of UI/UX standards, facilitation of architecture rituals (ADR, Code Review, Pair Programming) and writing of reference technical documentation.

    - Quality & Testing Culture: Implementation of robust CI/CD pipelines with guaranteed coverage through unit tests and end-to-end (E2E - Playwright/Cypress) tests.

    - Performance & Maintainability: Optimization of Angular application performance and drastic reduction of front-end technical debt.
    Angular Design System Design token Storybook CI/CD
  • Dijii
    Senior Front-End Engineer
    DIGITAL AND IT
    September 2016 - January 2019 (2 years and 4 months)
    Clichy, France

    AngularJS Engineer


    Objective: Design of modular and high-performance interfaces for data analysis.

    - Modular & Sustainable Architecture: Development of complex React/TypeScript components following Domain-Driven Design (DDD) and Clean Code principles to ensure long-term maintainability.

    - Code Security: Implementation of a comprehensive automated testing strategy (Jest & Cypress), halving the number of production regressions.

    - Critical Performance Optimization: Drastic improvement of Lighthouse scores through Lazy Loading and Bundle Splitting, ensuring maximum fluidity with large data volumes.

    - Agility & Multi-device: Continuous delivery in Agile/Scrum environment to ensure perfect compatibility across all devices (Desktop, Tablets, Mobile).
    Typescript Domain-Driven Design (DDD) Jest Web Performance User Interface Design

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Education

  • Master of Web Development
    IPSSI
    2015
    Master Développement Web
  • Web Developer & Integrator
    IFOCOP
    2014
    Développeur & Intégrateur Web

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