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Paul-Henri CallewaertPC

Paul-Henri Callewaert

Full-Stack Software Engineer

667 €/jour
Le Rœulx, BE
3-7 ans

Délai de réponse moyen : 1h

À propos de Paul-Henri

With a background in computer sciences and in economics, I can help you to build and maintain your projects alone or as part of a team.
I also founded a startup named Vedisee which is able to predict your tourist preferences and suggest you the perfect places to visit according to your constraints.
  • Français

    Bilingue ou natif

  • Anglais

    Bilingue ou natif

  • Néerlandais

    Capacité professionnelle limitée

Accepte de travailler sur site
Le Rœulx (jusqu’à 50 km), Namur (jusqu’à 50 km), Bruxelles (jusqu’à 50 km), Lille (jusqu’à 50 km), Luxembourg (jusqu’à 50 km)

Expériences

  • Smals
    Full-Stack Software Engineer
    SECTEUR PUBLIC & COLLECTIVITÉS
    avril 2026 - Aujourd'hui (2 mois)
    Bruxelles, Belgique
    Smals describes itself as "ICT for Society" and builds software for the Belgian public sector. On this assignment I work for the RSZ-ONSS (National Social Security Office), where I:

    • New service development: Building a brand-new full-stack service from the ground up with Angular 21 and Java 21, owning it across both the front-end and the back-end.
    • Legacy maintenance & evolution: Maintaining and evolving a portfolio of existing services across several Java projects (Spring Boot 3.5, Java Batch, Angular 16), keeping their versions consistent and current so they stay secure and maintainable.

    Technologies: Java 21, Spring Boot 3.5 (incl. Batch), Angular 21 & 16, SOA (REST/SOAP), PostgreSQL, OpenShift, OAuth2/OIDC, GitLab & Jenkins.
    JavaScript Spring boot Spring Batch Java Angular
  • Smals
    Full-Stack Software Engineer
    SECTEUR MÉDICAL
    janvier 2024 - décembre 2025 (1 an et 11 mois)
    Bruxelles, Belgique
    Smals describes itself as ICT for Society, it develops projects for the public sector. In this context, I worked for the Federal Agency for Medicines and Health Products where I did:
    • Projects Migrations: Executed migrations of Java and Angular projects to ensure alignment with the latest technologies, maintaining project relevance, security, and performance;
    • Code Refactoring: Refactored Java and Angular codebases to improve maintainability and introduced comprehensive test coverage;
    • Feature Development: Collaborated closely with customers, product owner (PO), analysts, and architect to design, implement new features tailored to business needs, delivering high-quality solutions on time;
    • Technical Mentorship: Mentored and guided a junior developer, teaching best practices in coding, testing, and Gitlab workflows, fostering their technical growth and contributing to team productivity and knowledge sharing.
    Technologies: Java (11->21) (EE, Spring (Boot, Security, Batch, MVC),
    JAX, Maven, Mockito & JUnit), Postman, SOA (REST, SOAP), PostgeSQL,
    Angular (15->19), Jest & Karma/Jasmine, OpenShift, HTML/CSS with
    scss/sass



    Angular Java Spring Spring boot PostgreSQL
  • Proximus
    Full-Stack Software Engineer
    TÉLÉCOMMUNICATIONS
    janvier 2021 - décembre 2023 (2 ans et 11 mois)
    Bruxelles, Belgique
    Developed new features (few of them below):
    • KYC (Know your customer): implementing a solution to check the customers identity. I had to request a third party service (Rest API) and define many scenarios from the front-end (Angular) to the back-end (Java Sring);
    • EasySwitch: When a customer changes from an operator to another, an automatic transfer can be processed. I contributed to the development of the front-end part (Angular) and to define the rules in the back-end part (Java Spring);
    • Improved the customer experience by adjusting the front-end to the customers journey (Angular) and the back-end to the business and legal requirements (Java Spring);
    • Configurations: Added the new products in configurations and update the back-end (Java Spring) accordingly;
    • Developed parts of the Finite State Machine (Node) with GraphQL and Apache Kafka in the context the reactive architecture between the front-end and back-end;
    Task force: I had to identify the bugs' root causes (Adobe Reports, Kibana, Splunk & Dynatrace) in production and tackle them to the fix (Angular, Java Spring & Node);

    Migrated AngularJS components to Angular;

    AGILE (refinements, daily standup's, pair-programming and teamwork);

    Technologies: Java 11 (Spring (Boot, Security, Batch, MVC), Maven & JUnit), Postman, SOA (REST, SOAP), Kafka, GraphQL, CouchBase, Angular (12 & JS), HTML/CSS (saas/scss), Jasmine, Adobe Reports, Kibana, Splunk, Dynatrace.
    Spring boot Java Angular Typescript JavaScript

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Formations

  • Ingénieur informatique
    INSA Hauts-de-France
    2025

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