Freelancer profile translated to English.

Description

Software engineer specializing in Java backend development, I work on projects with high technical requirements around microservices, REST APIs, reactive architectures, and performance optimization.

With a PhD in Computer Science from the University of Toulouse, I have over 7 years of experience in Java backend development in France and Switzerland, primarily in the health, insurance, and business software sectors.

I specialize in:

Java / Spring Boot backend development,
Microservices design,
REST APIs,
Reactive architectures with Spring WebFlux,
SQL and PostgreSQL optimization,
Application performance,
Load testing with Gatling,
Kafka and Redis integration,
Maintenance and evolution of critical applications.

During my assignments, I contributed to:

Performance optimization of high-traffic APIs,
DB2 to PostgreSQL migrations,
Implementation of ETL pipelines,
Distributed and reactive architectures,
Agile/Scrum projects in an international environment.

Main stack:

Java 8–21, Spring Boot, Spring WebFlux, PostgreSQL, Kafka, Docker, Hibernate, Angular, Redis, Jenkins, Grafana, Kibana.

I am available for Java backend development, performance optimization, microservices architecture, and application modernization assignments.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Iron Cloud | HUG
Senior Software Engineer
March 2025 - September 2025 (6 months)
Geneva, Switzerland
ePOP Project:
◦ Performance analysis and monitoring
◦ Data-driven optimization
◦ Data visualization via Grafana
◦ Development of performance and load tests on various APIs using Gatling in Java, with Redis integration for test data management.
◦ Optimization of REST APIs performance through reactive programming and Server-Sent Events (SSE) with Spring WebFlux.
◦ Backend development of features related to historization in ePOP with Java, Avro, and Kafka
◦ Monitoring and visualization of performance metrics using Grafana and Kibana.
◦ Development in a Java, Spring WebFlux environment, using IntelliJ IDEA.
◦ Service deployment via Pandora FMS and continuous integration with Jenkins.
◦ Participation in Sprint Plannings in an Agile/Scrum environment.

Technologies: Java, Spring WebFlux, Kafka, Avro, Gatling, Redis, SSE, Kibana, Grafana, Jenkins, Pandora FMS, IntelliJ IDEA, Bitbucket, Agile/Scrum
Java Spring Boot REST APIs Docker PostgreSQL performance-optimization
Globaz SA,
Software Engineer Developer
SOFTWARE PUBLISHING
February 2022 - July 2024 (2 years and 5 months)
Lausanne, Switzerland
AVS4.0 Project:
o Coordination with business teams
o Contribution to solution structuring
o Participation in requirements definition
o Contribution to hexagonal architecture and backend/frontend development of modules (affiliations, contributions, SEDEX integration).
o Optimization of API performance and improvement of response times through in-depth analysis of SQL queries.
o Development and optimization of stored procedures, triggers, and PL/SQL functions to automate data processing.
o Improvement of SQL query performance and relational database schemas.

WebAVS Project:
o Development of REST micro-services for XML file exchange via SFTP with Sedex.
o Collaboration with business analysts for estimation and requirements analysis.
o Maintenance and evolution of the application according to new AVS laws.
o Migration of DB2 databases to PostgreSQL with integrity control and query tuning.
o Design and implementation of ETL data pipelines for data extraction and transformation.
o Optimization of API and relational database performance (analysis and tuning of indexes for large databases in a production environment).

Technologies: Java 8-17, Spring Boot, Angular, PostgreSQL, Hibernate, ETCD, DB2, Docker, ElasticSearch, Git, Liquibase, JIRA, Confluence, Testing (UT/IT), Cucumber, Dynatrace, Talend, kafka, Postman
Java Spring Boot PostgreSQL Docker Angular Database Design
Evialog,
Full-Stack Web Developer
AUTOMOBILE
November 2018 - January 2022 (3 years and 2 months)
Thonon-les-Bains, France
LogVO
o Development and maintenance of a vehicle fleet management software (LogVO): vehicle file management, invoicing, SMS/Email alerts.
o Backend migration J2EE -> Java/Spring Boot + REST APIs.
o Frontend migration GWT -> Angular
o Remote training and technical support for end-users.
o Participation in the development of B2B and B2C websites connected to LogVO.

Technologies: Java 8-11, Angular, Spring Boot, GWT, HTML5/CSS3, PostgreSQL, Hibernate, JBoss, Tomcat, Git
Java Spring Boot microservices-architecture GWT Angular PostgreSQL

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PhD in Computer Science
Université Paul Sabatier Toulouse III
2017
Spécialisation en systèmes distribués, optimisation de requêtes et performance des bases de données. Travaux de recherche autour de l’optimisation hybride et robuste de requêtes dans les systèmes distribués.
Research Master's in Computer Science
Université Paul Sabatier Toulouse III
2013
Recherche d’information, bases de données et systèmes multimédias.

Check out Chiraz's education

Chiraz M.

Java Backend Developer | Spring Boot | Postgres

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