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Johann LosbarJL

Johann Losbar

Senior Software Architect | AI & API Systems

€500/day
Paris, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Johann

I help startups and companies design and structure scalable software systems, APIs, and platforms integrating artificial intelligence.

As a Senior Software Architect, I work on projects requiring a clear technical vision, a solid architecture, and reliable execution capability. My goal is not just to develop features, but to build robust, maintainable, and scalable foundations.

My areas of expertise include:
• Software architecture and API design
• Distributed systems structuring
• AI integration (LLM, RAG, multi-model orchestration)
• Performance and scalability optimization
• Technical guidance and leadership

I work with a pragmatic, results-oriented approach, focusing on quality, technical clarity, and the longevity of solutions.

If you are looking for a senior profile capable of structuring, securing, and evolving your architecture, I can assist you.
  • French

    Native or bilingual

  • English

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Autrice / NA3D
    Chief Technology Officer
    EDUCATION AND E-LEARNING
    March 2024 - December 2025 (1 year and 9 months)
    Paris, France
    SaaS platform for creating and distributing e-learning content.
    • Definition and steering of the platform's overall technical strategy
    • Design of the backend architecture and core application services
    • Deployment of features integrating AI workflows
    • Building and managing the engineering team (~10 people)
    • Supervision of cloud infrastructure, security, CI/CD, and operations
    Artificial Intelligence API CTO
  • Vestiaire Collective
    Engineering Manager
    LUXURY GOODS
    April 2022 - March 2024 (1 year and 11 months)
    Paris, France
    International e-commerce platform for reselling luxury goods.
    • Management and structuring of multidisciplinary engineering teams (~10 people), with a strong focus on mentoring and career development
    • Steering the technical roadmap for high-traffic products
    • Close coordination with product, data, design, and QA teams
    • Improvement of reliability, performance, and delivery standards
    • Key partner role for product teams on prioritization, scoping, and execution
    Leadership API Back-End Development Product Owner Front-End Development
  • Aufeminin / Marmiton
    Team Lead
    PRESS AND MEDIA
    February 2016 - April 2022 (6 years and 2 months)
    Paris, France
    High-traffic digital media platforms, reaching millions of users.
    Team management
    Mentoring & career development
    Recruitment & team structuring
    Cross-functional communication
    Technical decision-making
    • Leading and supporting a team of developers
    • Supervision of deployments and application quality
    • Migration of legacy infrastructures to AWS
    • Product Owner and Scrum Master role: prioritization, agile rituals, and cross-functional alignment
    Product Owner API Back-End Development Front-End Development Leadership

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Education

  • Master MIAGE
    Université d'Ivry
    2009
    Master MIAGE
  • DUT
    Diplôme d'Université Université de Vélizy
    2007
    DUT

Skill set

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