Idir Leham

Client: Generali

Function: Lead Developer – migration of Java platforms

Team: 12 people

Project:

Within a Java service center, technical management of a migration project aimed at modernizing and securing the technological base of applications (application server, Java version, frameworks, tests, MVC architecture).

Objective: to technically reduce the debt of obsolete or unmaintained platforms, while guaranteeing continuity and quality of service.

Achievements:

Recovery and validation of source code: recovery of applications, adaptation and execution locally according to existing configurations (Jboss and java 8).

Migration planning: definition of a granular roadmap for each application – in particular migration from Java 8 to Java 21, from JBoss 6 to Tomcat 10.

Updating the different versions of frameworks (Spring Framework, Spring Security, Spring Integration, Apache CXF, Hibernate, JPA, Mockito, H2, JUnit, …)

Progressive implementation: development of each step, refactoring, resolution of SonarQube alerts, updating unit tests.

Updating documentation (application sheet of the wiki, STD, environment, installation of the development station, etc.)

Automation & continuous deployment: generation of packages, creation of Jenkins jobs, monitoring of the delivery campaign up to production.

Documentation: updating application sheets on the wiki (STD, environment, dev station installation, etc.).

Technical environment:

Java (8, 17, 21) · IntelliJ · JBoss · Tomcat · JMeter · Maven · JSF · CXF · Spring MVC · Hibernate & JPA · JUnit 4 & 5 · OpenRewrite · VSCode, GitHub Copilot (GPT-4.1, GTP-4o, Claude Sonnet 3.5, Claude Sonnet 3.7 Thinking, Gemini 2.5 Pro ...)

Function: Senior Java SAPCC backend developer

Team: 20 people

Project: Redesign of the Galeries Lafayette website with the technological support of SAP Commerce Cloud (SAPCC, also known as Hybris).

Achievements:

Design and development of the shopping cart price calculation engine

Adaptation of SAPCC vouchers to the needs of Galeries Lafayette

Improvement of existing code (analysis with Sonar, optimization of logs, design improvements, etc.).

Performance analysis using: Dynatrace, Java Microbenchmark Harness, Java flight recorder, ...

Setting up a mock server

Detection and correction of security vulnerabilities (especially related to payments, returns and delivery costs)

Creation of Jira tasks related to code quality, performance issues, log management and security issues

Implementation of a monitoring service to solve the problem of multiple clicks

Technical environment:

Sapcc (aka hybris) , Java17, Intellij, Json-server, Dynatrace , Agile scrum, PlantUML, Postman, Jira

Function: Lead dev and technical support

Team: 200

Project: Participation in Decathlon's “Cube” omni-commerce transformation program (200 employees, product-mode organization) aimed at offering a fluid experience between the e-commerce site and stores, and deploying the tool internationally (functions: merchandising, customer account, logistics, web-analysis, payment, etc.).

Achievements:

Proactive on functional and technical aspects

Implementation of the mirakl marketplace integration process

Macro encryptions

Design: UML (Class diagram, sequence diagram, state-transition diagram, ...), PlantUML, Lucidchart

Development under Centos and Fedora, Eclipse & INTELLIJ IDEA, Docker, VM

SQL (Oracle BDD, Sql, PlSql)

Code refactoring

Implementation of unit tests (TDD), integration test

Project conducted using Agile/Kanban methodology (daily meeting, sprint, user stories, retrospectives, pair-programming)

Micro service: RPM – Design and development of a relay point management tool:

Technical specification

Architecture file

Integration of relay points (Mondial relay, Colissimo …)

Implementation of a distributed cache with redis

Relay point search algorithm

Unit and functional testing of the module

Website security audit:

Manual and automatic security vulnerability research

CSRF, IDOR, XSS, Open redirect, Http parameter Pollution, SQL injection, XML External Entity, Race condition, …

Tools: Owasp ZAP, Burp Suite, Fiddler, SqlMap...

Fix reported bugs.

Technical environment:

Languages: JAVA 8, Scala, UML, Merise

RDBMS: Oracle, PLSQL, PostgreSql

IDE: ECLIPSE 4.3, IntelliJ IDEA 14.1, PlantUML, Lucidchart, Docker

Continuous integration: JENKINS, SONAR, HUDSON, MAVEN 3, SVN, RTC, ANT

Framework: Spring boot, spring batch, atg, Hibernate, JPA, amazon S3 bucket

Security: Kali lunix, Burp suite, owasp zap, fidler