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Younes El HassaniYE

Younes El Hassani

Fullstack Java | Angular | GCP | Production & Reliability

€430/day
Lille, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Younes

Systems work… until an incident appears.
And then nobody understands why.

👉 That’s exactly where I come in.

Fullstack Java / Angular developer, I work on critical systems with a double expertise:

• backend: reliability, flows, performance
• frontend: complex interfaces integrating advanced business rules

🎯 What I bring
• stabilization of production systems (critical flows, batch jobs)
• reliability of event-driven architectures (Pub/Sub, Kafka)
• implementation of retries, DLQs, and idempotency
• development of complex Angular interfaces (validation, transformation, business data management)
• improvement of observability (logs, monitoring, tracing)
• performance and scaling optimization
• technical and functional analysis (requirements gathering, scoping, solution translation)

💻 Environment
Java / Spring Boot • GCP (Cloud Run, Pub/Sub, Workflows) • Angular
Microservices • Event-driven • APIs • Batch

🚀 Context of intervention
• large enterprise environments (retail)
• high volume
• interconnected systems
• high production constraints
• critical business interfaces used daily

🎯 My goal
Reduce incidents, make flows reliable, and make systems understandable — both technically and from a business perspective.

📩 Available for backend / fullstack missions with production challenges
  • French

    Native or bilingual

  • English

    Fluent

  • Arabic

    Native or bilingual

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

Experience

  • KIABI
    Fullstack Java / Angular Developer | GCP
    FASHION AND COSMETICS
    August 2025 - Today (10 months)
    Lille, France
    Client: Kiabi — International Assortment (Board SaaS integration)

    Implementation of a data exchange ecosystem between the IS and a planning SaaS (Board), in a context of high volume and business criticality.

    🎯 Objectives:
    • secure and make inter-system exchanges reliable
    • guarantee flow traceability
    • synchronize data and media between multiple systems

    💻 Achievements:

    • Design and development of secure backend flows (Java 21, Spring Boot)
    • Development of REST APIs for inter-system synchronization
    • Implementation of an event-driven architecture (Pub/Sub)
    • Deployment and operation on GCP (Cloud Run, Workflows, IAM, Storage)
    • Reliability and industrialization of exchanges via GitLab CI/CD

    • Development of an Angular application for image import and management
    • Integration with the Board SaaS for data and media synchronization
    • Improvement of user experience for business processes

    🤝 Transverse Contribution:
    • participation in the definition of the backend and cloud architecture
    • collaboration with product and business teams
    • consideration of security, performance, and scalability challenges

    📌 Environment:
    Java 21 • Spring Boot 3 • REST APIs • PostgreSQL
    GCP (Cloud Run, Pub/Sub, Workflows, IAM, Storage)
    Angular • Docker • GitLab CI/CD
    Java Spring Batch Spring boot Angular Google cloud
  • KIABI
    Fullstack Java / Angular Developer | GCP
    FASHION AND COSMETICS
    March 2022 - August 2025 (3 years and 5 months)
    Lille, France
    Client: Kiabi — Product Referencing (retail, high volume)

    Intervention on the modernization of the product referencing IS in a critical context (E2E flows, batch jobs, APIs, back-offices).

    🎯 Objectives:
    • stabilize production processing
    • make data flows reliable
    • improve performance and maintainability

    💻 Achievements:

    • Development of a budget calculation batch job (Java 21, Spring Batch)
    • Design of backend APIs in hexagonal architecture (Spring Boot)
    • Implementation of event-driven flows via Pub/Sub
    • Deployment on GCP (Cloud Run, Workflows)
    • Management of product assets (GCS: images, PDFs)
    • Optimization of backend performance and processing reliability
    • Implementation of monitoring and supervision for batch jobs

    • Development and evolution of Angular applications (business back-office)
    • Improvement of stability and UX of internal interfaces

    🤝 Transverse Contribution:
    • technical and functional analysis with business teams
    • translation of needs into technical solutions
    • participation in architectural decisions
    • close collaboration with product and tech teams

    📌 Environment:
    Java 17/21 • Spring Boot • Spring Batch • Angular
    GCP (Cloud Run, Pub/Sub, Workflows, GCS)
    SQL • Microservices • GitLab CI/CD • Terraform
    Java Spring boot Spring Batch Angular Google cloud
  • Laboratoire CRIStAL by Prodways,
    Java Development Intern – Distributed Computing & Modeling
    April 2021 - August 2021 (4 months)
    Upper France, France
    CRIStAL Lab – University of Lille

    Study and implementation of multi-agent systems (MAS) with temporality management in distributed environments.

    • Analysis and modeling of different forms of temporality in MAS.
    • Development of distributed computing mechanisms to compare implemented models.
    • Extraction and implementation of a minimal financial market from the ATOM platform.
    • Comparison of performance and behaviors according to temporality models.

    Stack: Java, distributed computing, modeling, multi-agent systems.
    Python PostgreSQL Git Java Back-End Development

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Education

  • Master MIAGE
    University of Lille
    2022
    Master MIAGE

Skill set

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