Senior Full Stack Developer (Java 21, React, Kafka)

Square One ResourcesWarsawnofluffjobspublished 10/28/2026

Must-have:TypeScriptJavaScriptJavaReactGitDockerKubernetesFrontendBackendFullstackScrumSecurity

SIMPL is a European Commission initiative developing an open, modular middleware platform for secure data sharing and interoperability across European data spaces. The project focuses on full-stack development using React, TypeScript, Java 21, Spring, and Kafka, including API development, system integrations, and platform enhancements within an international Agile team.
The project is currently extended until April 2027.

Design, develop, test, and maintain frontend applications using JavaScript, TypeScript, and React.
Design and implement backend services using Java 21, Spring Framework, Spring Boot, Spring MVC, Spring Integration, and Spring REST.
Develop and maintain REST APIs and platform integrations.
Build and support event-driven integrations using Apache Kafka.
Develop and optimize relational database interactions and queries.
Create and maintain automated unit tests using JUnit.
Build and package applications using Maven and deploy them on Tomcat-based environments.
Ensure code quality through peer reviews, SonarQube analysis, and secure coding practices.
Address security findings and vulnerabilities identified through Fortify and other security scans.
Support deployment and operational activities using Argo and Rancher.
Investigate and troubleshoot technical issues using logs, monitoring, and Elasticsearch.
Maintain code, configuration, and technical documentation in Git repositories, Jira, and Confluence.
Contribute to continuous improvement initiatives and engineering best practices within SIMPL.

Must have: