Senior Java Developer

Mission Overview:

Keystone Solutions is seeking a Senior Java Developer for a consultancy mission at a client site. The ideal candidate will have a minimum of 7 years of experience and possess strong skills in Java, Gradle, SpringBoot, Spring, Hibernate, and GWT. Knowledge of DB2 and PostgreSQL is also required.

Responsibilities:

• Adapt applications running on GlassFish 2/3/4 for migration to Payara5.

Requirements:

• Minimum 7 years of experience in Java development.
• Proficiency in Gradle, SpringBoot, Spring, Hibernate, and GWT.
• Good knowledge of DB2 and PostgreSQL.
• Experience in social security systems, particularly with Fedris, is a plus.

Why Join Keystone Solutions:

• Consultancy Nature: Work on-site and embrace your consultant identity.
• Dynamic Projects: Engage with diverse challenges across various client environments.
• Turbo-Charged Learning: Experience professional development and broad learning opportunities.
• Skyrocketing Ambition: Commit to your career growth within our framework.
• Values: As a

  If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.

  Duration: 06/07/2026 - 30/09/2026 3 months • (full time)

  Skills required:

  • DB2 - Level: Junior - Most recent: Any time
  • gradle 5.x - Level: Confirmed - Most recent: Any time
  • GWT 2.7 - Level: Confirmed - Most recent: Any time
  • Hibernate 5.5.X - Level: Confirmed - Most recent: Any time
  • java 8 - Level: Confirmed - Most recent: Any time
  • PostgreSQL - Level: Junior - Most recent: Any time
  • Spring 5.3.X - Level: Confirmed - Most recent: Any time
  • Spring Boot 2.7.X - Level: Confirmed - Most recent: Any time

  Language requirements:

  Dutch
  Level Passive knowledge
  English
  Level Passive knowledge
  French
  Level Active knowledge