Senior Java Developer | Spring Boot | Freelance | 100% on-site | Major European agency

Arbalett; Grand Est; Sur place; EUR 90 000 - 130 000; Plein temps

Résumé du poste

Arbalett in Strasbourg is seeking a Senior Java Developer for a long-term freelance contract, 100% on-site. You will design, develop, and maintain Java components, ensuring documentation and integration with third-party systems in an international context.

The ideal candidate has 10+ years in IT, strong Java/Spring Boot expertise, and excellent English. You will mentor juniors, participate in code reviews, and contribute to testing and deployment activities.

Qualifications

• Minimum 10 years of experience in IT, including at least 5 years in software and application development.
• Strong proficiency in Java and associated technologies: Spring Boot, Kafka / IBM Event Stream, PostgreSQL, Istio.
• Good knowledge of multi-tier web environments, web services, and APIs.
• Experience with Magnolia CMS, IBM Sterling ITX, ForgeRock / OpenID / OAuth 2.0, API Connect, IBM MQ Advanced is a plus.
• Minimum 1 year of experience with CASE tools or equivalent for modelling and development.
• Comfortable working in an international and multicultural environment, with the ability to adapt quickly to technological developments.
• Good level of English (minimum B2).

Responsabilités

• Design, develop, and maintain robust software components in Java, based on defined technical specifications and ensuring their documentation.
• Ensure the integration of technological components with one another and with third-party systems, while maintaining the consistency and reliability of the application architecture.
• Contribute to code quality by actively participating in code reviews, applying development best practices, and strengthening application security.
• Design and execute unit and integration tests, including through automation scripts, to ensure the reliability of deliverables in development environments.
• Support and mentor junior developers within the team, fostering technical cohesion and knowledge transfer.
• Contribute to the preparation and updating of technical documentation (components, installation and operational manuals) and provide support during deployment and configuration phases.

Connaissances

Java

Spring Boot

Kafka / IBM Event Stream

PostgreSQL

Istio

English (B2)

APIs

Mentoring

Code reviews

Outils

CASE tools

Description du poste

Senior Java Developer | Spring Boot | Long-term freelance contract | 100% on-site | Strasbourg | Major European agency | Competitive remuneration

We are actively seeking a Senior Java Developer for a long-term freelance contract within a major European agency.

Based in Strasbourg, you will join an international technical team and contribute to ambitious, high-stakes projects in an evolving technological environment that values technical excellence, rigour, and knowledge sharing.

Your responsibilities:

• Design, develop, and maintain robust software components in Java, based on defined technical specifications and ensuring their documentation.
• Ensure the integration of technological components with one another and with third-party systems, while maintaining the consistency and reliability of the application architecture.
• Contribute to code quality by actively participating in code reviews, applying development best practices, and strengthening application security.
• Design and execute unit and integration tests, including through automation scripts, to ensure the reliability of deliverables in development environments.
• Support and mentor junior developers within the team, fostering technical cohesion and knowledge transfer.
• Contribute to the preparation and updating of technical documentation (components, installation and operational manuals) and provide support during deployment and configuration phases.

Your profile:

• Minimum 10 years of experience in IT, including at least 5 years in software and application development.
• Strong proficiency in Java and associated technologies: Spring Boot, Kafka / IBM Event Stream, PostgreSQL, Istio.
• Good knowledge of multi-tier web environments, web services, and APIs.
• Experience with the following is a plus: Magnolia CMS, IBM Sterling ITX, ForgeRock / OpenID / OAuth 2.0, API Connect, IBM MQ Advanced.
• Minimum 1 year of experience with CASE tools or equivalent for modelling and development.
• Comfortable working in an international and multicultural environment, with the ability to adapt quickly to technological developments.
• Good level of English (minimum B2).

Our offer:

• A long-term freelance contract, 100% on-site, within an international institutional environment.
• Ambitious projects with high strategic impact, in a stimulating and constantly evolving technological context.
• A multicultural and innovative working environment, with high-level technical teams.
• Competitive remuneration, commensurate with your expertise and responsibilities.