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Paul-Henri CallewaertPC

Paul-Henri Callewaert

Full-Stack Software Engineer

€667/day
Le Rœulx, BE
3-7 years

Average response time: 1 hour

About 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.
  • French

    Native or bilingual

  • English

    Native or bilingual

  • Dutch

    Conversational

Can work on-site
Le Rœulx (up to 50km), Namur (up to 50km), Bruxelles (up to 50km), Lille (up to 50km), Luxembourg (up to 50km)

Experience

  • Smals
    Full-Stack Software Engineer
    PUBLIC SECTOR
    April 2026 - Today (2 months)
    Bruxelles, Belgium
    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
    MEDICAL
    January 2024 - December 2025 (1 year and 11 months)
    Bruxelles, Belgium
    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
    TELECOMMUNICATIONS
    January 2021 - December 2023 (2 years and 11 months)
    Bruxelles, Belgium
    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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Education

  • Ingénieur informatique
    INSA Hauts-de-France
    2025

Certifications

Skill set

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