Freelancer profile translated to English.

Description

Java Backend Developer | ERP Integration, APIs & Reliable Microservices

Looking to modernize your backend or ensure reliable system integration?

As a Java Developer with 8 years of experience, I specialize in designing REST APIs, **ERP integration**, and **implementing robust microservice architectures**. I help you structure your backend for performance, scalability, and maintainability.

Accustomed to high-traffic environments and critical systems, I pay close attention to maintainability, code readability, and data flow reliability.

I have participated in:

Setting up and modernizing ERP adapters (JSON ↔ XML)
Developing Spring Boot microservices
Implementing a Change Data Capture mechanism via Debezium
Setting up unit tests (JUnit / Mockito)
Projects in distributed architecture with Kafka

🔹 Core Technologies: Java (8–17), Spring Boot, JPA/Hibernate, Kafka, Debezium, REST APIs, Maven, Docker.

I can assist with:

Backend development
Architecture refactoring / modernization
Setting up new services
Optimizing and maintaining existing applications
Technical support and team mentoring

I prefer missions focused on business backend, integration, and distributed systems.

Available for full remote or hybrid missions depending on location.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Arabic
Basic

Workplace preferences

Remote only

Primarily works remotely

Contraste Digital
Backend Java / Golang Developer
April 2018 - Today (8 years and 2 months)
ERP Adapter Modernization (V1 → V2)

Migration of the adapter to a more robust and maintainable solution, with a clearer and unified multi-country architecture (FR / BE).

Migration to Java 17
Implementation of a Clean Architecture-inspired architecture
JPA / Hibernate Implementation
Setup of unit tests (JUnit / Mockito)
Participation in technical decisions within the team
Merging multi-country flows into a unified adapter
Collaboration with the infrastructure team for CI/CD and deployments

Technologies include Java 17, Spring Boot, JPA, Hibernate, Maven, Kafka, Docker, and Azure DevOps

Content Management & Distribution- Microservices Development

Backend architecture comprising about ten microservices in a high-traffic environment

Millions of users
~5000 articles published per day
Several thousand Kafka messages / day

Development of backend microservices dedicated to editorial content management and distribution
Implementation of a Change Data Capture mechanism via Debezium
Configuration of Debezium connectors
Production of Kafka events from database modifications
Automatic data synchronization between services
Integration of OpenSearch for dynamic indexing
Collaboration with infrastructure for cloud deployment via Northflank
Active participation in code reviews and technical decisions
Technologies include Java 11, Golang, Kafka, Debezium, OpenSearch,
Docker, and Northflank,
Java Golang Apache Kafka Spring Boot JPA/Hibernate
Contraste Digital, Marcq-en Barœul
Backend Java / Golang Developer
April 2018 - Today (8 years and 2 months)
Long-term mission at a Belgian press group

SSO Management– Version V2

Development of web services for user management, including password recovery and connection management.

Management of templates (login / reset password)
Implementation of email sending
Application support including identification and resolution of anomalies to ensure application availability and performance.
Knowledge transfer to new developers
Technologies include Golang, Git, GitLab, GitFlow, and Redmine

ERP Adapter V1– French ERP Integration

Setup of an adapter to simplify communication between websites and the ERP
Development of REST APIs on the adapter side
Transformation and adaptation of flows (JSON → XML)
Recording / traceability of transactions

Technologies include Java 8, Spring Framework, REST API, Apache
ServiceMix/Camel, and phpMyAdmin

Establishing exchanges between external partners and the ERP
using microservices

Participation in several services in Java 11 / Spring Boot to manage
communication between external partners and the ERP.
Development and evolution of REST APIs
Work in microservices approach
Technical assistance, bug fixes, and feature updates

Technologies include Java 11, Spring Boot, and REST API,
Spring Boot GO Spring Framework Microservices Maven
Pymma Software
Backend Java Developer
March 2017 - June 2017 (3 months)
Development of an insurance management web application – Spring / Vaadin Stack

Skill enhancement and implementation of a complete business application based on the Spring ecosystem.

Design and development of an insurance management web application with Spring Boot and Vaadin (backend + server UI architecture).

Development of a REST API documented via Swagger / OpenAPI.

Integration with an external API for data synchronization to the Dolibarr software.

Containerization and deployment of the application with Docker.

Project structuring according to Spring best practices (layered architecture, dependency management, configuration, etc.).
Spring Boot Docker REST API Development ERP Integration Maven

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Cybersecurity Training
Pop School
2018
Formation CyberSécurité
Professional Bachelor's Degree in Information Technology and Internet
University of Technology of Compiègne
2017
Licence professionnelle Technologie de l'Information et Internet

Check out Halim's education

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Halim Loukili

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About Halim

Java Backend Developer | ERP Integration, APIs & Reliable Microservices

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