Freelancer profile translated to English.

Description

Expert in application performance and technical architect with 30 years of experience in Java/Linux Open Source ecosystems.

I am the consultant called when a Java application in production is not scaling: I diagnose the entire chain — UI, Web Services, JVM, database, OS — I quantify bottlenecks and I fix them. Concrete result: x10 improvement in response times for a critical application at AGIRC-ARRCO (2024).

What I bring:

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End-to-end performance testing expertise: scoping, JMeter/Gatling scripting, campaigns, analysis, recommendations

Senior DBA MariaDB/MySQL/PostgreSQL: advanced tuning, high availability, schema audit

Java/JEE technical architecture on complex Linux infrastructures (on-premise, AWS/GCP Cloud)

Observability and dashboarding: Grafana, Prometheus, ELK, Splunk

DevOps automation: Ansible, Jenkins, Docker, Kubernetes

Doctorate in applied mathematics, I combine analytical rigor with field pragmatism. Autonomous, I integrate quickly into your teams and deliver measurable results.

📝 Technical blog: blog.kaptus.net | 💼 +30 years of freelance missions in large accounts

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Italian
Fluent

Workplace preferences

Can work on-site

Paris (up to 50km)

AGIRC-ARRCO
Application Performance Expert
PUBLIC SECTOR
June 2024 - Today (2 years and 2 months)
Paris, France
Center of expertise for — Contribution management application (new application, before go-live). Context: Scrum project methodology, performance expertise.
‣ UI performance audit and analysis (Vaadin, Angular): identification of bottlenecks before go-live;
‣ Load testing campaigns with JMeter (latest version): scenario design, injection, results analysis;
‣ PostgreSQL 16 query optimization and execution plan tuning: reduction of response time for certain critical screens by up to x10;
‣ Java 1.8 / 17 code analysis (Spring) and technical and functional improvement recommendations;
‣ Performance analysis of REST and SOAP Web Services, and Batch processing;
‣ Monitoring and correlation of metrics via Grafana / Prometheus and Splunk;
‣ Writing analysis reports and weekly presentations of results to project teams and business stakeholders.
Stack: PostgreSQL 16, Java 8 & 17, Spring, Jboss, JMeter, Grafana, Prometheus, Splunk, Red Hat Linux, Vaadin, Angular
Splunk Jboss Red Hat Linux PostgreSQL Grafana
GROUPE PRÉVOIR
Java/JEE Application Development
BANKING AND INSURANCE
January 2023 - February 2024 (1 year and 1 month)
Paris, France
‣ Definition of the architecture and establishment of the technical design document
‣ Java/JEE development of the call center application for the insurance company PRÉVOIR;
‣ Validation testing, deployment, and hosting on the KAPTUS infrastructure.
Stack: Java/JEE, Tomcat, MariaDB, Debian Linux, PROXMOX
BETCLIC
CI/CD & Observability / Dashboarding Expert
SPORTS
April 2022 - December 2022 (8 months)
Bordeaux, France
‣ Implementation of Jenkins monitoring for CI/CD and audit of the existing environment;
‣ Deployment of the Mimir stack as code in an EKS cluster via ArgoCD;
‣ Development of Grafana dashboards: DevOps KPIs (Jenkins, GitHub, SonarQube), FinOps AWS;
‣ Development of a Jenkins plugin to push metrics to Prometheus via PushGateway;
‣ Implementation of Grafana alerts (via Microsoft Teams) and knowledge transfer to internal teams.
Stack: Grafana, Prometheus, Mimir, ArgoCD, Kubernetes EKS (AWS), Jenkins, GitHub, SonarQube, Python, Scrum
Kubernetes Amazon Web Services VictoriaMetrics OpenTelemetry Argo CD