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Ahmed Ben AbderrahmaneAB

Ahmed Ben Abderrahmane

Supermalter

Java Developer | Spring Boot | Go

€600/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Ahmed

đź’» With over 10 years of experience in IT development and software architecture, I support my clients on large-scale projects by building reliable, scalable systems aligned with their product and business goals and visions.

📌 I specialize in:

- Designing high-performance and secure APIs and services for critical applications with high traffic and volume.
- Optimizing existing systems (performance, scalability, resilience).
- Modernizing legacy platforms towards modern architectures.

🚀 Key Experiences:

- Development of billing systems for Malt, the European leader in freelance marketplaces.
- Complete refactoring of air traffic scheduling systems for Qantas, Australia's largest airline (replacing 25+ years of legacy).
- Development of decision support solutions to optimize flight planning and disruption management at Qantas, thereby improving operational efficiency and customer experience.
- Design of scalable services and APIs optimizing the search experience for 5+ million users on Ricardo, Switzerland's largest e-commerce platform.

⚙️ I apply proven architectures (DDD, microservices, event-driven) with a focus on simplicity, maintainability, and performance.

🛠️ I adopt a "You Build It, You Run It" approach, with end-to-end ownership: design, development, deployment, and operation of critical systems.

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Tech Stack: Java (21), Spring Boot, Golang, Kotlin, SQL, PostgreSQL, MongoDB, Redis, Kafka, RabbitMQ, GCP, AWS, Apache Beam, Dataflow, Docker, Kubernetes, Terraform, CircleCI, GitHub Actions, Maven, Gradle, Grafana, Prometheus, Datadog.
  • English

    Fluent

  • French

    Native or bilingual

Can work on-site
Paris (up to 50km), Nice (up to 50km), Lyon (up to 50km), Marseille (up to 50km)

Experience

  • MALT
    Senior Software Engineer Java Kotlin Spring Boot
    SOFTWARE PUBLISHING
    February 2026 - Today (4 months)
    - Designing, developing and maintaining resilient billing systems to optimize invoicing, ensure regulatory compliance and enhance overall customer experience on Malt, the leading freelance marketplace in Europe.

    - Contributing to cross-functional initiatives at the intersection of product, engineering, finance, accountability and legal.
    Java Spring Boot Kotlin RabbitMQ PostgreSQL MongoDB
  • Swiss Marketplace Group (SMG)
    Senior Backend Engineer Java Spring Boot Golang
    E-COMMERCE
    October 2022 - January 2026 (3 years and 3 months)
    Nice, France
    • Designing, developing and maintaining scalable and high-performance backend systems optimizing the search experience for 5M+ users on Ricardo, the largest marketplace in Switzerland, by applying domain driven design, microservices and event-driven architecture principles.

    • Built a cutting-edge image embeddings-based search recommendation system powering Ricardo AI, a major innovation launched in 2024, that significantly enhanced user engagement and product discovery on the platform.

    • Developing SEO-focused initiatives (such as dynamic sitemaps generation, internal tools for SEO content curation) to enhance organic traffic and improve search engine rankings, in close collaboration with the SEO team.

    • Implementing and running Apache Beam pipelines on GCP Dataflow for large-scale data processing (e.g. Kafka events ingestion and aggregation).
    Java Spring Boot PostgreSQL Apache Kafka Redis Go
  • Amadeus
    Senior Backend Engineer Java
    SOFTWARE PUBLISHING
    December 2014 - October 2022 (7 years and 10 months)
    Nice, France
    • Designed, developed and maintained mission-critical systems for Qantas, the largest airline in Australia, within an agile multi-region DevOps-driven team.

    • Delivered scalable and high-performance decision support systems optimizing flight scheduling and disruption recovery, boosting operational efficiency and enhancing customer experience.

    • Handled responsibilities including requirements clarification with Business stakeholders, mentoring and ramping-up new-comers, promoting best practices within the team, production loads, stability and performance monitoring, data analytics and technical documentation.

    • Provided a recognized technical Subject Matter Expertise (SME) in data interfaces (read-write integration with Qantas information systems), business rules and decision support engines, automated load and performance tests as well as data analytics pipelines.
    Java Scala Couchbase Amazon Web Services Spark

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Education

  • MSc. in Engineering
    ENSTA Paris
    2014
    Optimization and Operations Research

Skill set

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