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Leo SollvellesLS

Leo Sollvelles

Full-Stack Developer

€550/day
Caen, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Leo

🚀 SaaS & Infrastructure Architect

I help tech startups and SMEs design, stabilize, and secure their SaaS applications and backend infrastructures.

I specialize in multi-service Docker architecture, secure Linux VPS deployment, and complex production bug resolution.

🔧 What I can do for you

Backend architecture design and structuring (Django / API)
Docker infrastructure deployment and security
Setting up automated backups and restore tests
Access security (VPN, role management, network isolation)
Advanced debugging (Frontend / API / Database)
Backend performance optimization
Local environment migration to production
Taking over and stabilizing existing projects
🧠 My working method

Clear initial audit
Work on Git branches
Backup before modification
Testing before production deployment
Clean deployment with possible rollback
Simple and understandable documentation
My goal: to make your system reliable, secure, and scalable, without unnecessary complexity.

🏗 Concrete experience

Creation and deployment of a complete business SaaS in production (client management, invoicing, reports, appointments).
Development of technical tools (Rust / VS Code extension).
Design of data pipelines and real-time oriented multi-agent architectures.
🎯 What you get

A global vision of the system (frontend / backend / data / infrastructure)
A reduction in production risks
A clean and maintainable architecture
A self-sufficient and structured point of contact
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • NWD
    OsteoPets – Business SaaS in Production
    MEDICAL
    November 2024 - Today (1 year and 9 months)
    Caen, France
    OsteoPets is a SaaS platform dedicated to animal osteopaths, designed and developed from start to finish.

    I was responsible for the complete technical architecture design, as well as the development and production deployment.

    Main responsibilities:
    • Design of a multi-service Docker architecture
    • Integration and management of payments via Stripe (subscriptions, webhooks, status management)
    • Backend development (API, business logic, user management)
    • Secure database management
    • Automated invoicing system
    • Clinical report generation
    • Appointment management and client sharing
    • Deployment on a secure Linux VPS
    • Setup of automated backups
    • Maintenance, upgrades, and zero-downtime deployments

    The project is currently in production with active users.
    Docker PostgreSQL Django Next.js Linux System Administration
  • Projet indépendant
    RestoBrain – Real-time Customer Review Analysis Platform
    RESTAURANTS AND FOOD SERVICE
    February 2025 - January 2026 (11 months)
    Caen, France
    RestoBrain is a SaaS platform dedicated to the collection and real-time analysis of customer reviews for restaurants.

    The project's objective was to centralize online reviews, analyze them using AI models, and present them in the form of decision-making dashboards.

    Main responsibilities:
    • Multi-service Docker architecture design
    • Automated ingestion system development
    • Data collection and normalization
    • Semantic analysis of reviews
    • Real-time indicator generation
    • Deployment on a secure Linux server
    • Database and storage management
    • Integration and management of payments via Stripe (subscriptions, webhooks, status management)

    The project resulted in the design of a robust architecture focused on real-time data.
    It is currently on strategic pause for technical evolution and product repositioning.
    Docker Python REST API Web Scraping
  • Projet R&D indépendant
    BoursoBrain – AI Multi-Agent Financial Analysis Platform
    PRIVATE EQUITY
    December 2025 - February 2026 (2 months)
    Caen, France
    BoursoBrain is an experimental platform dedicated to real-time financial flow analysis and the orchestration of decision-making AI agents.

    The project aims to demonstrate the impact of information flows on financial markets through a complete and modular data architecture.

    Technical Architecture:

    • RSS & Financial API Feed Ingestion (Finnhub)
    • Normalization and storage via MinIO (S3 compatible)
    • Real-time data pipeline
    • AI processing for structured “news cards” generation
    • Decision-making multi-agent network
    • MongoDB for state and decision management
    • Deployment on Linux server via multi-service Docker
    • Network security and isolation

    Project Objective:

    Design a robust architecture for automated financial information analysis and intelligent agent decision-making simulation.

    R&D Project demonstrating skills in:

    • Data Engineering
    • Multi-service Orchestration
    • SQL & NoSQL Databases
    • Distributed Architecture
    • Secure Production Deployment
    Minio Data Engineering MongoDB Docker REST API

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Education

  • Meta – Full-Stack Developer Certification
    coursera
    2025

Skill set

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