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Bastien YoussfiBY

Bastien Youssfi

Full-Stack Dev specialized in AI & Intelligent Agents

€300/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Bastien

What I can do for you

Custom AI Application Development

- Creation of specialized AI agents to automate your business processes
- Integration of Language Models (LLMs) and Speech-to-Text
- Self-hosting of AI models to ensure data privacy
- Development of intelligent prospecting and lead generation systems

Complete Full-Stack Solutions

- Modern web applications with React, NestJS, Node.js
- Robust backend architecture with Python (Flask), PHP Symfony
- Optimized databases (PostgreSQL, MongoDB, MySQL)
- Cloud deployment on AWS, Google Cloud, Firebase

In-depth Technical Expertise

- **Languages**: Python, TypeScript, JavaScript, C/C++, Java
- **Cloud & DevOps**: AWS, GCP, Docker, CI/CD, Self-hosting
- **AI & Data**: LLM, Machine Learning, Natural Language Processing
- **Certifications**: IBM Deep Learning Essentials, IBM Machine Learning Specialist

Why choose me?

**Tailored Approach**: Every project is unique, I adapt to your specific needs
**Practical AI Expertise**: I don't just use APIs, I can host and customize your own models
**Global Vision**: From design to production, I manage the entire development cycle
**Responsiveness**: Immediately available for your urgent projects
**Innovation**: Always at the forefront of the latest technologies

Let's work together!

Whether you need to automate processes, create an intelligent application, or modernize your infrastructure, I'm here to turn your ideas into reality.

Contact me to discuss your project and discover how AI can revolutionize your business.
  • French

    Native or bilingual

  • English

    Native or bilingual

  • Spanish

    Conversational

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

Experience

  • Steamulo
    Full-Stack Developer / Project Engineer
    SOFTWARE PUBLISHING
    January 2024 - Today (2 years and 5 months)
    Paris, France
    • Development of an AI-powered automated meeting report generation application
    • Development of an AI-assisted candidate processing application (CV data extraction, matching with job offers)
    • Self-hosting of AI models (LLM, Speech-to-Text), as well as creation of specialized AI agents,
    Artificial Intelligence SEO Web Development Front-End Development Back-End Development
  • Digital Surf
    Software Engineer Intern
    SOFTWARE PUBLISHING
    February 2023 - August 2023 (6 months)
    25000 Besançon, France
    Development of a surface co-localization add-on for Mountains software

    6-month internship at Digital Surf, a leading French publisher of surface analysis and metrology software. Mountains is used by industrial and research professionals to analyze topographic data from microscopes, profilometers, and other measurement instruments.

    Technical Achievements:

    Design and development of a module for co-localizing two surfaces acquired with different measurement techniques (roughness, temperature, granularity, etc.). This feature allows users to overlay and correlate heterogeneous data on the same analysis area.

    Implementation of the Radon transform in C++ to automatically detect optimal overlap zones between two surfaces. Optimization of calculation performance to process large data matrices in a reasonable time.

    Methodology:

    Agile methodology with regular sprints, code reviews, and continuous integration. Use of Visual Studio and internal versioning tools.

    Result:

    Add-on integrated into the commercial version of Mountains, now available to all software users worldwide.

    Stack: C++, Visual Studio, Image Processing Algorithms, Radon Transform
    Software Architecture Fullstack External API Integration C++ Microsoft Visual Studio
  • Voicy
    Full-Stack Developer / AI
    SOFTWARE PUBLISHING
    April 2025 - September 2025 (5 months)
    Paris, France
    Development of an automated prospecting platform using voice AI agents

    Design and development of a complete B2B lead generation solution using AI-powered voice conversational agents.

    Technical Achievements:

    Architecture of a multi-agent system orchestrating automated prospecting calls with real-time contextual personalization. Integration of the ElevenLabs API for natural voice synthesis and bidirectional conversation management. Implementation of webhooks for real-time interaction tracking and automatic prospect qualification.

    Backend development in TypeScript/NestJS with a PostgreSQL database for storing campaigns, call scripts, and prospect data. Implementation of a queue system with Redis to manage call volume and comply with external API rate limits.

    Infrastructure & DevOps:

    Deployment on AWS with Docker containerization. Configuration of auto-scaling to handle load spikes during massive campaigns. Monitoring of performance and API costs.

    Results:

    Solution that fully automates the telephone prospecting cycle, from target selection to qualified lead generation, significantly reducing the human time required.

    Stack: TypeScript, NestJS, PostgreSQL, Redis, Docker, AWS, ElevenLabs API, WebSockets
    Artificial Intelligence Automation External API Integration Fullstack AI Agents

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Education

  • Computer Science Engineering Degree
    Grenoble-INP, ENSIMAG
    2025
    Diplôme d'Ingénieur en Informatique
  • Master of Computer Science and Artificial Intelligence
    University of Tsukuba
    2024
    Master d'Informatique et d'IntelligenceArtificielle

Certifications

Skill set

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