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Grégoire BerthomesGB

Grégoire Berthomes

Tech Lead | Fullstack Architect | FinTech

€600/day
La Rochelle, FR
8-15 years

Average response time: 4 hours

Freelancer profile translated to English.
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About Grégoire

🟦Software Architect • Fintech • CTO-as-a-Service

👨‍💻 Entrepreneur and software architect with over10 years of experience**, I support companies, fintechs, and technical organizations in the **design, security, and scaling of critical digital platformswith high business value.

🎯 I work across the entire systems lifecycle: **architecture, development, infrastructure, compliance, operations, and product evolution**, with an approach focused on **performance, security, scalability, and ROI**.

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## 🚀 Core Expertise


🔹 Microservices architecture, high-availability APIs, and distributed systems
🔹 Development ofSaaS platforms, fintech solutions, and custom business tools
🔹 💳 Payments & fintech: KYC, wallets, IBAN, SEPA, AML-CFT compliance
🔹 ☁️ Cloud, hybrid, and on-premise infrastructures, CI/CD automation
🔹 🤖 AI integration and intelligent automation of business workflows
🔹 🔄 Migration, refactoring, and scaling of existing architectures

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## 💼 Global Value-Added Solutions


🔹 📄 Provision and integration ofprofessional software licenses
🔹 🖥️ Provision ofhardware and technical solutionsadapted to projects
🔹 📡 Deployment ofprofessional telecommunication solutions(voice, data, connectivity, convergence)
🔹 🧩 Strategic support:architecture, build, optimization, and operations

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⚡ Positioning: **Strategic Architecture, CTO-as-a-Service, creation or transformation of critical platforms**, with a pragmatic approach focused on results and business performance.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Youseeme
    Project Manager | Fullstack Developer | Architect
    BANKING AND INSURANCE
    January 2021 - Today (5 years and 5 months)
    Paris, France
    🎯 Context & Challenges

    Fintech platform offering IBAN and SEPA payment services through complete Treezor integration, as well as a crypto platform. Overall technical responsibility: architecture, development, team management, and regulatory compliance.

    ⚙️ Strategic Responsibilities
    • Design of the microservices architecture and transactional backend
    • Complete Treezor API integration (KYC, wallets, IBAN, transfers, webhooks)
    • Development of the client area and back-office (accounts, transactions, operations)
    • Setup of the crypto platform (wallets, orders, history)
    • Management of a technical team (3 developers) and coordination with partners
    • Administration of dedicated VMware / Proxmox infrastructure
    • AML-CFT compliance, audit trails, and identity verification processes
    📈 Results
    • Deployment of a complete banking platform integrated with Treezor
    • Industrialization of KYC processes and automated transactions
    • Scalable high-availability infrastructure
    Node.js Symfony MongoDB Next.js API
  • ADDREA
    President
    DIGITAL AND IT
    August 2016 - Today (9 years and 10 months)
    La Rochelle, France
    🎯 Context & Challenges

    Leading and developing technical structures and digital products with complete responsibility: compliance, finance, architecture, and delivery.

    ⚙️ Strategic Responsibilities
    • Leadership in compliance, governance, and regulatory documentation
    • Financial management and pre-accounting (treasury, invoicing, cost optimization)
    • Negotiation with suppliers, partners, and strategic contracts
    • Design and development of complex technical platforms (microservices, APIs, CI/CD)
    • Secure cloud and on-premise architecture
    📈 Results
    • Deployment of multiple SaaS and fintech platforms
    • Structuring of complete operational processes (finance, compliance, delivery)
    • End-to-end delivery capability in critical environments (fintech, security)
    Project Management Accounting Legal Compliance Node.js
  • Bulls Motorsports
    Fullstack Developer | Architect
    TRANSPORTATION
    August 2022 - February 2025 (2 years and 6 months)
    Cesson-Sévigné, France

    CONTEXT & CHALLENGES

    Development of a comprehensive internal management solution for an engine remapping specialist. The application covers customer, vehicle, service, and invoicing management, with an AI assistant accessible via Telegram to facilitate daily team operations.

    ACHIEVEMENTS

    ▸ Design and development of a complete business management software

    ▸ Decoupled architecture: Symfony/Bootstrap frontend + asynchronous Node.js engine
    ▸ Process engine: PDF generation, automated email sending, business workflows
    ▸ Integration of a Telegram bot with a conversational AI assistant
    ▸ Multi-LLM connection via LiteLLM (OpenAI, Anthropic, Mistral)
    ▸ Deployment and maintenance on VPS
    Node.js Bootstrap Symfony MongoDB Telegram

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Education

  • BTS SIO, Computer Engineering
    Lycée Guy Chauvet
    2015
    BTS SIO, Ingénierie informatique
  • Professional Baccalaureate SEN, Computer Systems and Telecommunications Networking
    Lycée progessionnel de rompsay
    2013
    Baccalauréat Progessionnel SEN, Mise en réseau de systèmes informatiques et télécommunications

Skill set

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