Senior Java Full Stack Developer

Mission Overview We are seeking a Senior Java Full Stack Developer for a consultancy mission at a client site, representing Keystone Solutions. In this role, you will develop, program, test, and maintain software applications to ensure they meet business needs and expectations. Key Responsibilities Participate in determining user needs and conduct feasibility analysis to understand requirements and assess technical feasibility for smooth application programming. Perform technical analysis and document changes and developments related to assigned applications to facilitate future modifications. Test solutions designed within the department and make necessary adjustments to ensure compliance with quality standards and business needs. Monitor production developments and make modifications as needed, contributing to the realization and improvement of assigned applications for an efficient development process. Control, analyze, and resolve intervention requests and bugs related to assigned applications to ensure optimal functionality. Act as a technical advisor for support and functional questions regarding software applications and management software, providing support for optimal use and development of various applications. Requirements Understand client requests and needs, critically analyze them (what, why, who, when, where, and how), and maintain a critical, analytical, and creative approach. Comprehend various database modeling concepts and object-oriented programming. Ability to work across the entire technical backend chain and the technologies used. Strong expertise in JAVA 8+ (Reactive Streams, performance, etc.) and associated frameworks (primarily Spring and Maven). Good knowledge of components such as Jenkins, JIRA, Git. Experience in implementing microservices and database queries (Oracle, SQL, and DB2) is a plus. Document applications for which you are responsible (e.g., user manuals, processes, etc.). Participate in the Agile way of life of the team (SCRUM Methodology). Develop and test new features or bug fixes in JAVA following existing patterns. Test your own work or that of a team member and support the business in data usage. Conduct technical analyses and challenge business analyses. Adhere to governance and IT strategy. Master's degree, Bachelor's degree, or equivalent experience. Minimum of 5 years of professional experience. Concrete experience in JAVA analysis and development (preferably Spring and Reactive Streams). Good knowledge of Git, Jenkins, and JIRA components. Good knowledge of databases (Oracle, SQL, DB2, etc.). Familiarity with IDEs like IntelliJ or similar. Good frontend experience with the latest versions of Angular (React is a plus). Comfortable with concepts such as ngrx, openid connect, HTML, CSS, TypeScript, and SASS. Knowledge of Json Form is also an asset. Good knowledge of French or Dutch (oral/written) and knowledge of English (oral/written). Oral comprehension of French is an asset (French-speaking team). Desired Qualities Synthesis skills and good organizational sense. Proactive in work and seeking new solutions. Autonomous. Rigorous. Good communication skills. Listening skills. Self-taught. Apply If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal. Duration 01/08/2026 - 31/12/2026 (5 months, full time) Skills Required Agile – Level: Intermediate – Most recent: Any time Angular – Level: Expert – Most recent: Any time Java – Level: Expert – Most recent: Any time Jira – Level: Intermediate – Most recent: Any time Microservices – Level: Advanced – Most recent: Any time React – Level: Expert – Most recent: Any time Language Requirements Dutch or French (Native or bilingual proficiency) English (Professional working proficiency) #J-18808-Ljbffr