Develop
Business apps, web interfaces, batch processes and APIs
Software developer & IT analyst
Julien Esterbet
Business applications • Web products • Experiments
I design and develop business applications, from requirements analysis to implementation and testing. My work draws on rigour, an understanding of how people use software, and a curiosity that extends beyond it.
React & TypeScriptJava & SQLSolidity & ethers.js
Design • Build • ImproveUseful, clear and maintainable products
PhilosophySociologyEconomics & politics
About me
Understand to act freely.
Understand
Technical systems, organizations and human challenges
Examine ideas
Engage with opposing arguments and understand where disagreements lie
As a software developer and IT analyst at PREPAR-VIE, I work on business applications in the life insurance sector. My background combines computing and finance, requirements analysis, development and an understanding of operational constraints.
What engages me extends far beyond this field: human and collective questions, behaviour, the quality of public debate and democratic participation. My thinking draws on psychology, sociology, philosophy and geopolitics, alongside questions of freedom, responsibility, and individual and digital sovereignty.
I value in-depth discussion, serious engagement with opposing arguments and pluralism. Technology is also an object of critical reflection: I am as interested in its possibilities as in the dependencies, power structures and forms of surveillance it can create.
I want to contribute to demanding, meaningful projects, digital or otherwise. My writing and travels belong here too: they are part of what I learn, what I question and how my perspective develops.
What engages me extends far beyond this field: human and collective questions, behaviour, the quality of public debate and democratic participation. My thinking draws on psychology, sociology, philosophy and geopolitics, alongside questions of freedom, responsibility, and individual and digital sovereignty.
I value in-depth discussion, serious engagement with opposing arguments and pluralism. Technology is also an object of critical reflection: I am as interested in its possibilities as in the dependencies, power structures and forms of surveillance it can create.
I want to contribute to demanding, meaningful projects, digital or otherwise. My writing and travels belong here too: they are part of what I learn, what I question and how my perspective develops.
Selected projects
Completed and ongoing projects
Products, prototypes and projects in preparation, each presented through its purpose, architecture and actual status.
Active product
Bruno Pizza — Production
A local desktop application that imports and validates an Excel plan, organizes production by distributor and guides preparation pizza by pizza.
Active portfolio
My-Website
A bilingual React and Vite portfolio bringing together projects, Web3 experiments, travel stories and reflections in a responsive, accessible experience.
Academic prototype
On-chain file archiving
An academic EVM prototype exploring the timestamping of public document references through a smart contract.
New project · In development
Agora — Debate graph
An exploration of how to make public disagreements easier to understand by connecting arguments, objections, responses, facts and sources without imposing a conclusion.
- Contrasting arguments
- Visible sources
- Explicit uncertainty
Explore the project’s intent
Why this project?
Public debate often mixes facts, interpretations, causal claims, predictions and values. Agora aims to make these differences visible so that people can better understand where a disagreement actually lies.
Objective
Organize a public question as a graph of supporting and opposing arguments, objections, responses, evidence and sources. The goal is not to tell people what to think, but to make reasoning easier to examine and challenge.
Design principles
Present the strongest arguments from different positions, preserve original sources, make uncertainty visible and avoid simplistic truth scores when a controversy also involves values.
Current state
An unpublished local prototype already makes it possible to explore a demonstration debate through a graph and an accessible text view, search and filter its elements, consult their sources and prepare a contribution that remains in the browser. It does not yet include accounts, remote collaboration or a public moderation system.
Open questions
The initial audience, editorial governance, contribution verification, moderation, hosting and future connections with Reflection Studio and the Democratic Observatory remain to be defined.
Skills
What I can build
A full-stack foundation focused on business applications, information systems and Web3 integrations.
Frontend
Modern interfaces, reusable components and clean user experiences.
ReactTypeScriptAngularGSAP / Framer Motion
In practice: portfolio interface and navigationBackend & IS
APIs, batch processes, business logic, data processing and integration with existing systems.
JavaSQLREST APIsBusiness batches
In practice: Bruno Pizza API and storageBlockchain & Web3
Smart contracts, wallet integrations, on-chain data and decentralized application design.
Solidityethers.jsHardhatSmart contracts
View the academic Web3 prototype codeBackground and method
Where I come from, how I work
A background at the crossroads of computer science, finance and Web3, extended through software work in demanding business environments.
Hybrid education
A technical foundation complemented by finance and blockchain technologies.
Education at the crossroads of computer science, finance and Web3
Academic projects kept as learning evidence without presenting them as products
A lasting interest in the economic, social and political impact of technology
Business practice
Current experience in life insurance, working with real systems and operational needs.
Building and evolving business web interfaces
Batch processing and workflow automation
Contributing to document management systems
Integrating with existing information systems
Working method
Understand the need, move through verifiable steps and make limitations explicit.
Frame the problem, users and useful scope
Build in clear increments instead of working through a long tunnel
Test behavior, accessibility, security and performance according to risk
Document decisions, trade-offs and remaining improvements
A bit more personal
What drives me
Beyond code, these are the ideas that shape my path: building, learning, questioning, discovering and moving forward without losing myself.
Following ideas
Writing and reflections
Personal essays to examine ideas, make doubts explicit and explore disagreements.
Being wary of simple oppositions
A personal reflection on our tendency to simplify reality, binary oppositions, responsibility, determinism and the difficulty of understanding without excusing.
Truth, freedom and self-construction
A personal reflection on doubt, determinisms, truth, individual responsibility and the way we build ourselves.
Beyond the everyday
Travels and perspectives
Places, encounters and memories that shape my perspective.
February 2025
Lisbon
A few days in Lisbon with Hugo, discovering the city, nightlife and Portuguese food.
Read this storyGet in touch
Contact me
Available
An idea, a project or a discussion?
For a project, a professional opportunity or a discussion about ideas and shared interests, you can reach me here.