Full Stack Developer Java React Consultant

Keystone Solutions • Brussels, Brussels • Posted June 20, 2026

Position Overview

Mission Overview:

This is a consultancy mission at a client site, where you will represent Keystone Solutions as a Full Stack Developer (Java/React). As a Keystone Solutions consultant, you will be hired to work on client projects, bringing your expertise and our values to every engagement.


Key Responsibilities:

  • Translate requirements into high quality code.
  • Design, build, and maintain high performance, reusable, and reliable Java code based on Spring Framework.
  • Collaborate with cross-functional teams to ship new features.
  • Work with outside data sources and APIs.
  • Ensure the best possible performance, quality, and responsiveness of the application.
  • Unit-test code for robustness, including edge cases, usability, and general reliability.
  • Identify and correct bottlenecks and fix bugs.
  • Help maintain code quality, organization, and automatization.

Mi...