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Julien LeroyJL

Julien Leroy

Performance and Industrial Methods Engineer

€450/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

My specialty: I combine a concrete understanding of production and support service issues (methods, quality, etc.), acquired from the shop floor, with development skills that allow me to design the analysis, automation, and management tools my clients need.

Thus, I help industrial sites reduce waste in their processes (production and support services) through a structured, analytical, and factual approach, drawing on the principles of Lean Manufacturing and continuous improvement.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km), Amiens (up to 10km), Lille (up to 10km), Rouen (up to 10km)

Experience

  • Freelance - Ferroviaire
    Performance and Methods Engineer - Railway
    TRANSPORTATION
    October 2025 - Today (10 months)
    Tergnier, France
    Supporting teams in the ramp-up phase of heavy maintenance operations:

    - Reliability of standard times and throughput times for heavy railway maintenance operations: ~€300k in avoided costs and ~4,000 hours of recalculated workforce load
    - Active contribution to the development of standards for a methods department in transformation
    - Conducting workload/capacity studies and optimizing load leveling in a takt-paced flow
    - Development of tools for collecting, processing, and analyzing operational data
    - Design of visual management and industrial management assistance tools
    - Conducting inter-site data benchmarks to identify performance gaps and improvement levers
    - Pragmatic use of AI for rapid prototyping of industrial tools
    Time study Data analysis Continuous improvement Process optimization Industrialization
  • Freelance
    Entrepreneur (e-commerce)
    March 2025 - August 2025 (5 months)
    • • Conducted in-depth market research
    • • Managed supply chain operations: sourcing, supplier monitoring, cost, deadline, and quality monitoring
    • • Developed KPIs and dashboards to track business model results and performance

    Tools: Kanban, Budget Tracking, Microsoft Power BI, English, Microsoft Excel
  • SNCF Voyageurs (maintenance ferroviaire),
    Methods and Performance Engineer
    March 2023 - October 2024 (1 year and 7 months)
    Rue de Bischheim, Schiltigheim, France
    Managed the performance optimization of the TER Grand-Est fleet's mid-life maintenance operation for a maintenance unit of 160 people.
    • • Analyzed existing processes using a LEAN approach, identifying bottlenecks and waste, and prioritizing improvement actions
    • • Researched and deployed production and maintenance tools, equipment, and processes
    • • Created, monitored, and analyzed production performance indicators (KPIs), with physical (A3) and digital (Power BI) dashboards
    • • Benchmarked expertise and methods
    • • Wrote and updated operating procedures; trained maintenance agents; calculated standard times; provided technical support to agents
    • • Reduced unit maintenance times for TER bays by 50%; achieved a gain of 3 million euros
    • • Optimized production workflows and bills of materials for production management
    • • Deployed the internal MES (Manufacturing Execution System)
    • • Managed QRQC (Quick Response Quality Control) topics for rapid resolution of quality problems
    Tools: Project management, Ishikawa, root cause analysis, A3, field work, Power BI

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Education

  • Master of Industrial Engineering
    University of Strasbourg
    2021
    Master Génie Industriel
  • Bachelor of Science for Engineers in Industrial Engineering
    University of Strasbourg
    2019
    Licence Sciences pour l'Ingénieur Génie Industriel et

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