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Julien Esterbet

Product-minded full-stack developer · FinTech · Business applications · Web3

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Full-stack developer and IT analyst turning business needs into reliable applications with Java, Angular, APIs and document workflows. My background combines FinTech, delivery quality and hands-on Web3 projects.

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Professional experience

Software Developer and IT Analyst

PREPAR-VIE · Permanent contract · Paris · April 2025 — present

  • Design, enhancement and maintenance of Java and Angular applications supporting unit-linked life insurance products.
  • Analysis of business requirements and translation into technical solutions with functional teams and partners.
  • Development of document batches, API integrations and SQL, XML and JSON data workflows.
  • JUnit and Mockito testing, GitLab/Jenkins integration, documentation, refactoring and production delivery support.

Skills used : Java, Angular, REST APIs, SQL, software quality, CI/CD and functional-technical analysis.

Business Analyst

PREPAR-VIE · Fixed-term contract · Paris · August 2024 — January 2025

  • Requirements gathering, functional specifications and analysis of regulatory impacts.
  • User acceptance test coordination, defect follow-up and support for business teams through validation.
  • Document digitalisation through APIs and OpenText Content Server in a life insurance environment.

Skills used : Business analysis, UAT, coordination, stakeholder communication and document management.

Financial Software Developer

PREPAR-VIE · Internship · Paris · January 2024 — July 2024

  • Enhanced and automated internal financial tools for market data and portfolio management.
  • Analysed user needs, improved processing reliability and streamlined workflows with business users.

Skills used : Financial systems, automation, data analysis, business understanding and problem solving.

Blockchain Consultant and Developer

SIB · Internship · Rennes · April 2022 — July 2022

  • Applied research into Ethereum, smart contracts, data integrity and their use in healthcare.
  • Designed a Solidity and web prototype for certifying document references.
  • Presented technical choices while addressing security, traceability and confidentiality considerations.

Skills used : Solidity, Ethereum, technical research, prototyping, data security and communication.

Manager — student position

McDonald’s Gare · Rennes · October 2018 — March 2022

  • Operational supervision, team support and priority management.

Education

European Master’s Programme in Financial Technologies

University of Rennes and Eötvös Loránd University · 2022 — 2024

European dual programme taught in English; first year completed with honours and a study period in Budapest. FinTech, finance, machine learning, security, innovation and blockchain.

Thesis: “Integrating Blockchain for Enhanced Security, Transparency, and Efficiency in Life Insurance Services at Prepar-Vie.”

Bachelor’s Degree in Computer Science — MIAGE

University of Rennes · 2019 — 2022

Degree awarded in 2022. Business-oriented computer science, data analysis, programming, economics, statistics and modelling.

Selected projects

Active product

Bruno Pizza — Production

Production-management desktop product built with React, TypeScript, Electron, Express and SQLite.

Active portfolio

My-Website

Bilingual React and Vite portfolio rebuilt with a documented RGAA accessibility approach.

Academic prototype

Megalis

EVM prototype for timestamping document references on-chain with Solidity.