Freelancer profile translated to English.
Back to original languageAbout Vincent
Slowness in features? An application that's becoming difficult to maintain? Complex business needs to implement? That's exactly where I come in!
Senior Backend Developer**, I design and implement features with strong business logic. My approach is centered on design and value delivery, not on the language. In practice, I mainly work with **Java/ Spring Boot,Python/ FastAPI, andC++**. I identify and fix **algorithmicandSQLquery slowness to ensure good performance for your critical features. My background inSoftware Craftsmanshipallows me to design code that is readable and maintainable by your entire team.
Concrete Achievements
- **Optimization of a C++ calculation engine**: 10x reduction in processing time, latency eliminated in production.
- **Optimization of critical SQL queries**: Elimination of 30 minutes of degradation at server startup and removal of data inconsistency risks.
- **Development of an automatic routing engine in a banking/insurance context**: Elimination of manual assignment errors and reduction in claim processing time.
- **Audit of a statistical distribution algorithm**: Identification of undocumented behavior, system correction, and clear restitution to stakeholders.
I use AI tools as **design and validation assistants**. The goal is to go faster, not to delegate understanding.
Available for remote work or in Nantes. 15 minutes are enough to assess if I can help you.
Need end-to-end delivery? I can also integrate my developments on the frontend side (Vue.js).
French
Native or bilingual
English
Fluent
Can work on-site
Nantes (up to 30km), Paris (up to 30km), Lyon (up to 30km), Bordeaux (up to 30km), Toulouse (up to 30km)
Experience
- Legend2.frSenior Backend Developer | Business Logic & PerformanceENTERTAINMENT AND LEISUREAugust 2020 - October 2025 (5 years and 2 months)Paris, FranceCo-technical lead on a real-time distributed online game application (500 concurrent connections, 20,000 registered users). Multi-instance architecture inC++with inter-instance data synchronization and a user interface in **Python**.
What I Contributed
- **Feature Design**: Systematic modeling before implementation (Excel, Python) to validate progression, balancing, and consistency with existing systems. These documents served as the basis for each development.
- **Algorithmic Reliability**: Audit and correction of a statistical distribution algorithm with undocumented behavior. Identification of the system's real boundaries, correction, and transparent, simplified communication with users.
- Performance**: Optimization of a C++ calculation engine (**10x reduction in processing time**) and critical SQL queries — **elimination of 30 minutes of degradationat server startup and removal of data inconsistency risks.
- Software Quality**: Progressive refactoring of a legacy codebase using **SOLID, KISS, and DRYprinciples — restoration of maintainability and reduction of delivery cycles.
- AI Pipeline**: Design of an automated translation tool using a **local LLM(Llama 3) following a Context-Aware strategy — guaranteed consistency across thousands of translation keys and data confidentiality.
- Natixis AssurancesERP Developer (JVM/Gosu) | Banking-Insurance Sector | ApprenticeshipBANKING AND INSURANCESeptember 2019 - July 2020 (10 months)Paris, FranceIntegration into an Agile (Scrum) team of 4 developers, 8 Business Analysts, and 2 Infrastructure Engineers. Participation in agile ceremonies and collaboration with an external QA team.
What I Contributed
- Business Rule Development**: Implementation of complex logic in Gosu (JVM / **Java8 equivalent) on the Guidewire ClaimCenter ERP — translation of functional requirements into robust logical components in a demanding banking environment.
- **Automatic Routing Engine**: Design of an automatic court assignment system upon claim creation — elimination of manual assignment errors and reduction in processing time.
- Réseau GESBackend Java Developer | API & Service Integration | ApprenticeshipEDUCATION AND E-LEARNINGSeptember 2018 - July 2019 (10 months)Boulogne-Billancourt, FranceDevelopment of an API and an intranet for centralized management of a network of higher education institutions within an Agile team of 6 developers (**Java** /Spring/ Hibernate).
What I Contributed
- **Virtual Class Module**: Development of an automatic online course management system via a partner API, with access control based on schedules (students and professors) — elimination of manual interventions and increased reliability of course access.
- Quality & Knowledge Transfer**: Improvement of the onboarding process for new developers and creation of **SQLpractical exercises to facilitate understanding of the data model.
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Education
- Master in Software ArchitectureÉcole Supérieure en Génie Informatique2020Mastère - RNCP I - Expert en ingénierie des systèmes d'informations, Ingénierie logicielle Mémoire : Software Craftsmanship, une discipline à introduire dans nos métiers.
- Bachelor in Software ArchitectureÉcole Supérieure en Génie Informatique2018Bachelor - RNCP II - Chef de projet logiciel et réseaux, Ingénierie logicielle