Back End Developer

Back-End Developer

Location: Strasbourg, France (100% onsite)

Role Type: Long term contract

Day Rate: €650/day

EU Nationality Required

Role Overview

The Back-End Developer will be responsible for developing and maintaining core back-end services for a platform, with a strong focus on enterprise Java, secure messaging, databases, and interoperability standards used across justice systems.

Core Responsibilities

• Implement and maintain Spring-based services.
• Design and consume SOAP and REST APIs.
• Work with multiple relational and non-relational databases.
• Implement security, cryptography, and trust services.
• Support interoperability standards used in European justice systems.

Required Technical Skills

Backend & Frameworks

• Java (Amazon Corretto 8/11/17/21)
• Spring Framework (Spring Boot, Spring Data, Spring JDBC, Spring Data JPA)
• Hibernate / Jakarta Persistence API
• Apache CXF (SOAP & REST)
• Tomcat / Jakarta EE / J2EE

Security & Trust

• Certificates, PKI, encryption, digital signatures
• Key stores
• WS-Security (Spring Web Services Security)
• DSS Tools (EC security framework)
• Digital Signature Service (European Commission)

Messaging & Standards

• ebMS
• AS4
• ASiC-S
• ETSI-REM

Data & Storage

• Databases: MySQL, MariaDB, MS SQL, Oracle, PostgreSQL
• H2 (testing)
• File storage and processing: MongoDB, S3

DevOps & Tooling

• Maven / Gradle
• Liquibase
• Jenkins
• Docker
• JUnit 4 & 5, Mockito
• Logback
• Javadoc, AsciiDoc (Asciidoctor