Freelancer profile translated to English.

Description

Senior developer with a strong background as a Lead Developer, Technical Expert, and Consultant, I undertake high-value missions for large corporations as well as SMEs/startups.

My dual technical and leadership expertise allows me to address various challenges: building solutions from scratch, structuring complex architectures, code and performance audits, and guiding teams towards best practices.

What I bring to your projects:

*Construction & architecture— implementation of robust application foundations, business domain slicing (DDD), REST APIs, full-stack Java / Spring / React applications

*Data Engineering— data lake design, large-volume processing pipelines (Kafka, Spark, Scala, Elasticsearch, Hadoop)

*LLM & AI Expertise— audit and guidance for integrating language models into business applications, GPU deployment (Nvidia H100)

*Audit & Consulting— performance, code, architecture, and deployment audits, with actionable recommendations and implementation monitoring

*Technical Leadership— team management, skill development, technical reference for complex multi-stakeholder projects

**References**: MAIF · EDF · RCA · and other multi-sector clients

Based in Niort, I work remotely or on-site depending on project needs.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Niort (up to 50km)

EI Guillaume Le Floch
Lead Developer | Insurance Intermediation Platform
BANKING AND INSURANCE
September 2025 - Today (11 months)
Niort, France
As Lead Developer, I managed the design and development of an intermediation platform enabling external partners to distribute MAIF insurance products.

Technical Scope:

Design and development of REST APIs (Java / Spring) exposed to partners, with a focus on robustness, security, and documentation (OpenAPI)
Development of public landing pages in React, designed for conversion and end-user experience
Deployment and production on Clever Cloud

Role & Responsibilities:

Technical reference for the entire scope, from architecture to implementation choices
Coordination between MAIF teams and partner integration constraints
Guarantee of code quality and best practices
Java Spring boot React.js Helm CleverCloud
EI Guillaume Le Floch
Lead Developer | Generic Accounting Integration Connector
PUBLISHING
January 2025 - Today (1 year and 7 months)
Nantes, France
As Lead Developer, I led my team in the design and development of a generic connector enabling RCA clients to automate data synchronization between RCA pre-accounting tools and major accounting software on the market (Pennylane, MyUnisoft, etc.).

Technical Scope:

Design of the connector's architecture, intended to be generic, extensible, and capable of adapting to multiple target software
Development of REST APIs (Java / Spring) managing data flows between systems
Integration with partners' external APIs via OpenAPI
Deployment and infrastructure on AWS

Role & Responsibilities:

Co-design of the architecture with the team, ensuring the solution's generality and scalability
Technical reference for implementation choices and integration patterns
Coordination of development to ensure compatibility with different target software
Java Spring boot AWS Terraform OAuth2
Zenika
Audit & Consulting | Multi-Client
CONSULTING AND AUDITS
March 2023 - April 2026 (3 years and 1 month)
Niort, France
Mandated as a technical expert by an IT consulting firm, I carried out several short interventions with different clients, covering both auditing and implementation support for various advanced technical issues.

Scope of Interventions:
MySQL performance audit — analysis of bottlenecks, identification of critical queries, and optimization recommendations
Implementation of a distributed L2 Hibernate cache — design and implementation of a caching strategy to improve application performance
Code & architecture audit — maintainability diagnostics on legacy applications, refactoring and modernization recommendations
LLM integration audit (ChatBot) — evaluation of technical choices for integrating language models into a conversational application
LLM deployment audit on Nvidia H100 GPU — analysis of infrastructure and configurations for high-performance hardware model inference

Approach:

Intervention as an independent expert, producing actionable deliverables (reports, recommendations) and monitoring implementation as needed
Ability to quickly gain context on heterogeneous environments and issues
Langchain Python Scaleway OpenAI SQL

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Google cloud certified professional Data Engineer CKAD: Certified Kubernetes Application Developer
Google cloud certified professional Data Engineer CKAD: Certified Kubernetes Application Developer
Master of Engineering (M.Eng.)
Esir
2013
Master of Engineering (M.Eng.)

Check out Guillaume's education

CKAD: Certified Kubernetes Application Developer
The Linux Foundation
2024
https://www.credly.com/badges/411c0063-e59a-41e4-85b1-af3441ba6b8d/linked_in_profile
Kubernetes
Google cloud certified professional Data Engineer
Google
https://www.credly.com/badges/5ab2aab4-551f-4568-8008-de6a419887e4/public_url
Big Query Google Cloud Storage Google cloud Dataproc Dataflow

Guillaume Le Floch

Lead Developer

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