Freelancer profile translated to English.
Back to original languageAbout Arhalai
Expert Java Backend | Performance & Architecture Microservices | Migration to WebFlux
Senior Java Developer with over 10 years of experience, I help companies optimize their backend systems and modernize their architecture.
My areas of expertise:
⚡ Performance Optimization (response time, scalability, cost reduction)
🧩 Microservices Architecture (design, refactoring, resilience, observability)
🔄 Migrating applications to reactive architectures with Spring WebFlux
🔧 Improving code quality and reducing technical debt
🎯 What I can do for you:
Quick technical audit and concrete recommendations
Resolving production performance issues
Migrating Spring Boot to reactive solutions
Implementing scalable and robust architectures
🛠️ Technical Stack:
Java, Spring (Boot, WebFlux), microservices, REST APIs, Docker, Kubernetes, CI/CD
📈 Results:
Significant performance improvement
More scalable and maintainable systems
Reduced infrastructure costs
French
Fluent
English
Fluent
Arabic
Native or bilingual
Can work on-site
Lille (up to 50km)
Experience
- Secteur assuranceJava/Spring ExpertJanuary 2025 - Today (1 year and 5 months)Migration of backend to Spring Webflux.Optimization of Batch processes for client and contract integration.Improvement of API response time.Reduction of technical debt and improvement of code quality.Reduction of production incidents.
- Secteur assuranceSenior JAVA DeveloperBANKING AND INSURANCEFebruary 2022 - March 2025 (3 years and 1 month)Lille, FranceMigration of CRM and development of REST APIs to ensure CRM integration.
- Refactoring and code restructuring by adopting Java development best practices.
- Writing and automating unit tests using JUnit and Mockito.
- Development of REST APIs and real-time client data integration.
- Development of batches in Spring Batch for massive client integration into the CRM database.
- Writing technical and functional project documentation. Release management, application deployment, and release note publication. Production incident management and end-user support.
- Optimization of application performance by reducing SQL query latency.
- System supervision and application performance monitoring using Dynatrace metrics, with weekly performance reporting and improvement suggestions.
- Application of Agile methodologies (Scrum).
- Tools: Java 17, Spring Boot, Spring Kafka, JSP, Servlet, Efficy CRM, Junit/Mockito, SOAP, SQL, Jenkins, GIT, JS/HTML/CSS, Dynatrace, Intelliji, Linux.
- Secteur bancaireFull Stack JAVA/Angular DeveloperJuly 2020 - January 2022 (1 year and 6 months)Lille, FranceDevelopment of a web application to manage the client subscription process.
- Design and development of backend microservices to power the front-end application.
- Front-end development with Angular, creating reusable components. Application performance optimization by implementing a caching system.
- Ensuring code quality through SonarQube, code reviews, and unit tests.
- Deployment of the application to the testing environment and release monitoring.
- Monitoring application performance and logs via Splunk. Leading technical workshops with cross-functional teams.
- Active contribution to daily stand-ups, sprint planning, and retrospectives for agile and iterative feature delivery.
- Tools: Java 8, Spring Boot 2.2, Spring Security, Spring WebFlux, EHcache, Angular, Junit/Mockito, SOAP, Jenkins, GIT, JS/HTML/CSS, Intelliji, Tomcat, Splunk, OpenShift, Docker, Kubernetes, MongoDB
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Education
- Computer EngineeringNational School of Applied Sciences2013Ingénieur en développement logiciel
- License in Mathematics and Computer ScienceNational School of Applied Sciences2009Mathématiques et Informatiques