You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Giovanni ColonniGC

Giovanni Colonni

AI Engineer | Senior FullStack Developer

€500/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Giovanni

You have a product to move forward, not just code to stack. As a Paris-based full-stack engineer, I assist you from architecture to deployment: web and mobile applications, APIs, AI pipelines, and cloud infrastructure – with real ownership of the results.

Concretely, I can help you launch or scale an MVP, refactor a slow app, industrialize your deployments, or integrate AI (RAG, agents, MCP) into an existing product – without sacrificing quality or maintainability.

What sets me apart: a dual tech lead and hands-on role. I've led teams while also delivering myself, reduced a P99 loading time from 17s to 3s, and designed production RAG pipelines for fintech and ERP. DevOps (Terraform, Kubernetes, GitOps on Azure) + AI (LangChain, embeddings, LLM orchestration): rarely both in the same profile.

Usual deliverables: React / Next.js / React Native apps, Node.js or Go APIs, front-end refactors, third-party integrations (ERP, payment, data providers), App Store / Play Store mobile apps, infra as code, CI/CD, MCP servers connected to your business data, back-offices, and internal tools.

Startups, scale-ups, SMEs – let's talk about your next milestone.
  • Italian

    Native or bilingual

  • English

    Fluent

  • Spanish

    Fluent

  • French

    Fluent

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

Experience

  • Paage
    Fullstack Tech Lead
    TECH
    February 2026 - May 2026 (3 months)
    Paris, France
    Tech — 40% leadership / 60% hands-on full-stack. UI performance overhaul — cut P99 total page load from 17s → 3s (≈83% reduction) by refactoring client-side fetch and data-loading logic, optimising backend API endpoints, and applying targeted React rendering optimisations. Intelligence pipeline (Scrape + RAG + LLMs + Analysis) — end-to-end system for data collection, classification, and clustering using RAG, LLM orchestration, embeddings, and clustering to derive the classification topology. Production pipeline (retrieval, vector storage, eval loop, observability) — powering UX personalisation and product page SEO to cut churn from misaligned messaging.
    React | Next.js PostgreSQL RAG User Experience Design LLM
  • Feefty
    Software Engineer
    BANKING AND INSURANCE
    May 2024 - February 2026 (1 year and 9 months)
    Paris, France
    Feefty is a platform focused on structured financial products, allowing users to buy, request, and create personalised structured products, with additional services for issuers and financial advisors. JavaScript-based stack: React and Next.js on the frontend, Node.js on the backend. Integrated the platform with enterprise financial data providers (Harvest) to keep portfolio positions, quotations, and account status continuously in sync. Designed and implemented a LLM driven system for automated booking. Developed and maintained features across the full product stack — back-office tools and client-facing applications under strict UI/UX constraints.
    React | Next.js PostgreSQL Back-End Development Node.js
  • Amadeus - Nice (FR)
    DevOps Engineer
    SOFTWARE PUBLISHING
    January 2023 - May 2024 (1 year and 4 months)
    Nice, France
    Designed hybrid CI/CD pipelines for Amadeus applications, from the development phase up to deployment both on Azure and on-premise infrastructure, integrating Terraform in the management of Azure cloud infrastructure and nodes. Developing and maintaining a Container Deployment Manager service for internal tool (both office and production tools) +150 services, leveraging Azure technologies and Services; also Kubernetes resources and other tools like Helm and ArgoCD, React for the FR and python for BK.
    Kubernetes Microsoft Azure React.js Python Programming GitOps

Recommendations

LB
Koami K.KK
Louis Bidault and 1 other person have recommended Giovanni

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Erasmus+ Exchange
    Universitat Politècnica de Catalunya
    2022
    Erasmus+ Exchange
  • Master's Degree
    Polytechnic of Turin
    2022
    Master's Degree

Skill set

Categories