About

Aymen Jamaaoui

Lead Java Developer · Backend & Full Stack

I am based in Île-de-France. For more than 15 years, I have designed and improved Java applications, from finance to the public sector, where reliability is not negotiable. Distributed microservices, real-time data flows, secure applications: I like work where every detail matters. I care about software craftsmanship. I write clean, tested and readable code that another developer can take over easily, years later.

What I do

Modernize existing systems: improve applications in production step by step, without breaking anything for users.
Design distributed architectures: split a monolith into microservices, run in containers and deployed on Kubernetes.
Automate delivery: set up CI/CD pipelines to deliver often and with no surprises.
Secure applications: authentication, encrypted exchanges and fixing vulnerabilities.
Help the team grow: review code, help with technical choices and support developers.
Build with AI: use coding assistants and agents to go faster without losing quality.

Skills

My toolbox

Languages

Java
TypeScript
Shell
Python
Groovy

Backend

Spring Boot
Kafka
REST
SOAP
GraphQL
WebSockets

Frontend

Angular
PrimeNG
React

Cloud & Infra

Docker
Cloud
Kubernetes
Jenkins
Ansible
AWS

Data

PostgreSQL
Oracle
MySQL
MongoDB
Redshift

AI & agents

Claude Code
LLM
RAG
MCP
function calling

Where I worked

Demanding institutions

I have been lucky to work for institutions where mistakes are not an option. At BNP Paribas Securities Services, I took part in the migration to T2S, the European platform for securities settlement, up to the production cutovers. At the Bibliothèque nationale de France (the French national library), I designed from scratch the legal deposit portal for moving images. At Euronext, the leading stock exchange operator in Europe, I led the rebuild of a tool that runs thousands of tests every day, without stopping the teams’ work.

See my full background →

Open source

Giving back to the community

I contribute to open source. Here are some projects I have contributed to:

QuickFIX/J: the open source Java implementation of the FIX protocol. GitHub →
Simple Binary Encoding (SBE): a very fast binary encoding library, used in finance. GitHub →
Floci: a local emulator of AWS services, written in Java with Quarkus. GitHub →

Education & certifications