Freelancer profile translated to English.
Back to original languageAbout Dominique
I intervene on search platforms facing stability, performance, relevance, or migration issues. My missions cover technical audits, complex incident diagnostics, distributed architecture optimization, and evolution towards semantic, hybrid search, and RAG architectures.
Over 50 missions completed for major public and private clients (EDF, AP-HP, UGAP, La Poste, RATP, Naval Group, Carrefour, Canal+...).
- Complex incident diagnostics
- Performance analysis and load scaling
- Solr, Elasticsearch, and OpenSearch architecture design and audit
- Search result relevance optimization
- Semantic search and RAG
- Indexing strategy definition
- Technical team support and knowledge transfer
- Version upgrades and migration to Solr, Elasticsearch, and OpenSearch
- Deployment of search applications in Cloud environments (GCP, AWS, Terraform)
English
Fluent
French
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- EDFApache Solr - Audit and stabilization of a SolrCloud platformENERGY AND UTILITIESJanuary 2021 - March 2023 (2 years and 3 months)
- Diagnosis of root causes for instability and performance degradation of a SolrCloud archival cluster handling up to 1.5 billion documents.
- Cross-analysis of JVM/GC logs, thread dumps, heap dumps, system metrics, and configurations for Linux, Zookeeper, SolrCloud, and indexing schemas to identify factors of CPU saturation, memory pressure, and response time slowdowns.
- Identification of several improvement areas: commit and searcher opening strategy, query and cache optimization (including filterCache pre-warming upon node restart), replication architecture, sharding, and JVM configuration.
- Once the production environment was stabilized, definition of a modernization roadmap covering TLOG replication and indexing schema optimization.
- UGAPElastic Stack 8.x - Observability platform migrationPUBLIC SECTORSeptember 2024 - December 2024 (3 months)Paris, France
- Migration of an Elastic Stack 6.x platform to Elastic Stack 8.x on a production infrastructure comprising a 5-node Elasticsearch cluster.
- Design and deployment of a secure architecture based on Elasticsearch, Kibana, Logstash, Fleet, Elastic Agent, and APM.
- Implementation of native Elastic Stack security: TLS, certificate management, authentication, authorization, and node/agent enrollment mechanisms.
- Centralization via Fleet and Elastic Agent for log and metric collection, supplemented by application traces via APM Server, to unify agent administration, deployment, and lifecycle management.
- Activation of Stack Monitoring and definition of ILM policies for data retention and rotation according to usage and operational constraints.
- Creation of installation, operation, administration, and version upgrade procedures.
- Education NationaleApache Solr - School establishment search application ACCEPUBLIC SECTORJanuary 2020 - June 2026 (6 years and 5 months)Paris, France
- Design and initial development (2020) of a web application for searching and consulting French school establishments using an Apache Solr 8 engine.
- Full-stack development: user interface (responsive front-end, lightweight framework) and search back-end (PHP, Solr, PostgreSQL), including Solr query construction, facets, mapping, sorting, and relevance tailored to business needs.
- 2023 Maintenance: Implementation of an indexing ETL pipeline feeding Solr: extraction from the Ministry's Ramsese REST API, caching and transformation in MongoDB, consolidation in PostgreSQL, then Solr indexing — replacing the historical process based on DIH.
- 2026 Maintenance: modernization of the application chain: upgrade to PHP 8.4 and Solr 9, multi-environment Docker Compose containerization (dev, test, pre-prod, production), and industrialization of packaging and deployment (build, installation scripts).
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Education
- Master of Computer ScienceUniversity of Besançon1989
Skill set
Categories
- Other