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Raed Ben Haj GacemRB

Raed Ben Haj Gacem

Senior Software Engineer | Tech Lead

€750/day
Paris, FR
8-15 years

Average response time: 1 hour

About Raed

I help companies build scalable, high-performance backend systems and improve search relevance and performance.

Senior Java Engineer / Tech Lead specialized in DDD and distributed architectures, with strong expertise in OpenSearch / Elasticsearch and AI-driven search (embeddings, ranking, semantic search).

I bring added value by combining backend engineering + search expertise + AI integration to deliver systems that are both fast and highly relevant.

Typical projects:

  • Search engine design & optimization (OpenSearch / Elasticsearch)
  • Microservices & event-driven architectures (Kafka, Spring Boot)
  • Performance, scalability, and relevance improvements
  • English

    Native or bilingual

  • French

    Native or bilingual

  • Arabic

    Native or bilingual

Can work on-site
Paris (up to 50km)

Experience

  • MIRAKL ADS
    Senior Software Engineer
    E-COMMERCE
    September 2023 - Today (2 years and 9 months)
    Paris, France
    • Core contributor to the sponsored products and display banners search engine, focusing on relevance, performance, and scalability
    • Designed and implemented advanced semantic search features using OpenSearch and embedding vectors in collaboration with the Data Science team
    • • Worked closely with Data Scientists to integrate ranking models and continuously improve product visibility and click-through rate
    • Led performance optimization efforts, reducing search latency and improving system throughput under high load
    • •Actively participated in the Firefighter rotation, a dedicated support mission assisting Customer Success and client integration teams with onboarding, incident resolution, and solution implementation
    • Worked across a modern cloud-native stack including Java, Spring Boot, OpenSearch, Kubernetes, Databricks, PostgreSQL, GitHub, and GitHub Actions
    Java Spring boot Opensearch Kubernetes Apache Kafka
  • CARREFOUR
    Software Engineer | Tech Lead
    E-COMMERCE
    September 2020 - Today (5 years and 9 months)
    Paris, France
    • Tech Lead of the omnichannel search engine carrefour.fr
    • Redesign the data ingest microservices to an event-driven and distributed architecture by using Stateless and Clusterless services based on a streaming Kafka system in order to reduce desynchronization issues and infrastructure cost
    • Improve search engine performance in order to handle 300 request/sec and responding below 80ms for the 75th percentile
    • Improve Team Agile Velocity and Traceability by finding the right expert to delegate and track feature delivery tech issues
    • Contribute to enlarging team responsibility and staffing
    • •Discuss & Validate technical choices with developers, QA team, the Enterprise Core Architects
    • •Coordinate with Production teams on the delivery process
    Elasticsearch Spring boot Apache Kafka Cloud GCP Java
  • ADELEAN
    Software Engineer
    TECH
    September 2020 - Today (5 years and 9 months)
    Paris, France
    • Support Production teams for scalability (Migrations, upgrades...)
    • Improve software production (Docker, Configuration playbooks, CI / CD pipelines...
    • Participate in the developpement of a collaboratif search engine all.site(ElasticStack, Java/Kotlin, SpringBoot, OVH, Gitlab, Docker, AWS)

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Education

  • SOFTWARE ENGINEERING (TOP 3)
    INSAT (National Institute of Applied Science and Technology)
    2018

Certifications

  • Certified Kubernetes Application DeveloperProfessional Cloud developer
    THE LINUX FOUNDATION
    2023
    Kubernetes
  • Professional Cloud developer
    GOOGLE CLOUD
    2023
    Google cloud

Skill set

Categories