Freelancer profile translated to English.
Back to original languageAbout Elyes
I secure your critical production environments by combining realistic load testing and fine-grained system observability, from e-commerce tunnels to cloud-native APIs.
For over 10 years, I have been supporting major clients (RATP, GRDF, DOCAPOST) as well as e-commerce merchants in optimizing their web platforms and ensuring performance tuning.
My approach combines strategic vision with technical precision to ensure resilience and sustainable performance.
🚀Achievements:
- Secured the production deployment of Java batches processing 11 million data records in under 4 hours.
- Intervened in a production incident as part of a task force, identifying the root cause of connection loss to the database during user authentication for about ten users.
- Reduced page loading time by 60% during Black Friday on a merchant's website.
- Secured the conversion tunnel: reduced cart page loading time and resolved critical server anomalies (500 errors) on the merchant's website.
- Identified the root cause of a memory leak in a module running in production.
💡Key Skills:
- Troubleshooting, JVM Tuning, Oracle & PostgreSQL
- Performance Testing (Neoload, Jmeter, Octoperf, Gatling)
- APM (Dynatrace, Datagog, Splunk, Grafana...)
- Observability (Log analysis, metrics, and distributed tracing)
- API Testing with Postman, Bruno, and SoapUI
- Development of automated tests with Selenium, Playwright integrated into CI/CD (Jenkins, GitHub)
French
Native or bilingual
English
Native or bilingual
German
Basic
Can work on-site
Paris (up to 50km)
Experience
- PrestashopQA Performance SpecialistE-COMMERCEJanuary 2023 - Today (3 years and 7 months)Paris, France
CONTEXT
Securing seasonal load increases (Black Friday, Sales) on a platform serving thousands of merchants.MISSION
- Design, execute, and industrialize platform load testing campaigns.
- Implement production observability to correlate synthetic tests with real behavior.
ACHIEVEMENTS
- Implemented an OctoPerf load testing framework capable of simulating up to 5k concurrent users.
- Reduced module response time by 45% after identifying a production memory leak.
- Set up Grafana and GCP dashboards for comprehensive observability.
- Troubleshot a production incident (pod restart too often) and identified the root cause (a probe establishing a database connection with each iteration).
- Created an OctoPerf MCP Server for analyzing and comparing test results with AI.
STACK
OctoPerf, Grafana, PostgreSQL, Docker, Kubernetes,GitLab CI, Go, Python, Node.js, Symfony, PHP - GRDFPerformance & Observability ExpertENERGY AND UTILITIESJanuary 2021 - November 2022 (1 year and 10 months)Paris, France
CONTEXT
GRDF, the national natural gas distributor serving 11 million customers, operates a critical 24/7 IT system under strict regulatory and seasonal constraints (winter peaks, meter reading campaigns).MISSION
- Ensure the load capacity of critical business applications in pre-production.
- Intervene in task forces for production performance incidents, using observability as a diagnostic tool.
ACHIEVEMENTS
- Design and execution of performance testing campaigns (Neoload, JMeter) on pre-production environments (production mirror).
- Diagnosis and resolution of critical production incidents using Dynatrace.
- Identification of JVM memory leaks, unoptimized Oracle queries, and contention points on Tomcat.
- JVM and Tomcat server tuning, resulting in a reduction of over 50% in response times for the most solicited flows with JMS.
- Analysis and optimization of critical Oracle queries (execution plans, indexes, statistics) with a measured gain of 80% in batch processing time.
- Production of decision-support reports for the IT department and development teams, including quantified action plans and targeted technical recommendations by component.
STACK
Neoload, JMeter, Dynatrace, Tomcat, JVM (Java 8/11), Oracle, Linux,Shell, Java, Spring Boot - DocaposteQuality and Performance ExpertPUBLIC SECTORNovember 2020 - January 2021 (2 months)Paris, France
CONTEXT
Docaposte, the digital subsidiary of Groupe La Poste, operates critical e-services for the public sector and local authorities, with major load peaks for citizen online services (administrative deadlines, online declarations).MISSION
Short expertise mission: Reinforcement intervention on a critical production performance incident, with the objective of providing a root cause diagnosis and immediate corrective recommendations within two months.ACHIEVEMENTS
- Investigation and reverse engineering of a critical incident reported by the CIO, affecting the MariaDB database during simultaneous user authentication.
- Definition of a targeted testing strategy and reproduction of the anomaly in the testing environment.
- Modeling and scripting of complex load scenarios using Neoload to stress the platform on the affected functionalities.
- Diagnosis delivered on confirmed root causes (database connection pool saturation and database tuning for transaction cache management).
- Production of a final test report with recommendations and technical advice provided to the Dev and CIO teams.
STACK
Neoload, Linux/Java environments, production monitoring,application log and metric analysis
Recommendations
Be the first to recommend Elyes
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- National Diploma in Computer Engineering,ESPRIT2011Diplôme National d'Ingénieur en informatique,
- Tunisian Baccalaureate – Math Section2006Baccalauréat Tunisienne – Section Math
Certifications
- NEOLAOD ExpertNeotys a Tricentis company2016
- Octoperf ExpertOctoperf2023