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Guy Mandina NzezaGM

Guy Mandina Nzeza

Lead Tech Backend Java | Spring | Cloud & DevOps

€660/day
Nanterre, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guy

Lead Tech / Senior Backend Engineer – Java, Spring, Cloud

With over 15 years of experience, I help companies design and implement robust, secure, and scalable backend architectures.

I primarily work in demanding environments (banking, fintech, large corporations) where reliability, performance, and delivery quality are critical. As a Tech Lead, I drive architectural choices, establish best practices (clean code, testing, CI/CD, DevSecOps), and upskill teams.

💡What I bring to my clients:
- Design of performance and resilience-oriented Spring Boot architectures
- Migration and modernization to the Cloud (IBM Cloud, Azure, Kubernetes…)
- Implementation and optimization of CI/CD pipelines
- Improvement of software quality and reduction of technical debt
- Technical leadership and coordination with Product Owners and agile teams

I am recognized for my ability to combine technical vision, pragmatism, and business orientation to deliver reliable, maintainable solutions aligned with strategic objectives.

Available for missions as a Lead Tech or Senior Backend Developer.
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • BNP Paribas Personal Finance
    Lead Tech
    BANKING AND INSURANCE
    January 2023 - October 2025 (2 years and 9 months)
    Levallois-Perret, France
    As an experienced technical lead, I managed a team for the migration of projects to the cloud (IBM Cloud). My role allowed me to develop developers while maximizing business value and ensuring the security and reliability of solutions delivered in a demanding environment.

    Achievements
    ➔ Close collaboration with Product Owners and agile teams to maximize business value and accelerate agile transformation.
    ➔ Contribution to the implementation and improvement of DevSecOps pipelines (continuous integration, security, test automation).
    ➔ Level 3 technical support management (bug analysis, production monitoring, on-call duty).
    ➔ Active participation in defining target architectures and evolving technical solutions.
    ➔ Performance testing leadership

    Technical Environment
    ➔ Framework: Spring
    ➔ Languages: Java
    ➔ Continuous Integration: Gitlab, Jenkins
    ➔ IDE: Jetbrains Intellij
    Java Spring boot Apache Kafka IBM Cloud CI/CD
  • Banque Internationale à Luxembourg (BIL)
    Mobile Developer
    BANKING AND INSURANCE
    January 2022 - June 2022 (5 months)
    Amsterdam, Netherlands
    Mobile developer in the team building the BILnet application for iOS and Android. The contract's objective is to build a new payment authorization and data access system via a third-party application compliant with the European PSD2 standard.

    Role:
    ➔ Contribution to the development of new features.
    ➔ Legacy code maintenance
    React Native iOS Android
  • ING
    Software Engineer
    BANKING AND INSURANCE
    April 2020 - December 2021 (1 year and 8 months)
    Amsterdam, Netherlands
    Fullstack developer in the team providing tools for clients and prospects to prepare and track their appointments with customer advisors.

    Role:
    ➔ Contribute to the development of new features
    ➔ Application maintenance
    ➔ Migration from Gitlab to Azure DevOps
    Java JavaScript Scala Azure DevOps Gitlab

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Education

  • Master 2, Advanced Computer Science and Applications
    Université de la Méditerranée (Aix-Marseille II)
    2009
    Master 2, Informatique Avancé et Applications

Skill set

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