Back-End Engineer - International Projects

Altia; Brussel Hoofdstad; On-site; EUR 70,000 - 110,000; Full time

Job summary

Altia is seeking a Senior Back-end Software Engineer to join our team on an international project focused on secure, scalable back-end solutions. You will contribute to API design, database optimization, CI/CD pipelines, cloud deployments, and collaboration with international teams across Europe.

Ideal candidates have 5+ years in IT with Java/Spring Boot, REST APIs, and Docker/Kubernetes. Strong problem-solving and OpenAPI experience are valuable assets for this role.

Qualifications

• 5+ years in IT in Mobility/Transport and/or Energy sectors.
• 3+ years with Java, Spring Boot, REST, databases and Docker.
• English B2 or higher, written and spoken.
• Strong back-end architecture and scalable design knowledge.
• Experience with REST API design and OpenAPI/Swagger.

Responsibilities

• Design, develop and maintain secure, scalable back-end applications and APIs.
• Integrate with external services and optimise database performance.
• Ensure API security, automated testing and CI/CD pipelines.
• Participate in cloud deployments and Kubernetes operations.
• Collaborate with international teams across Europe.

Skills

Java

Spring Boot

REST APIs

Cloud

Docker

CI/CD

Kubernetes

OpenAPI/Swagger

Database design

Testing

Education

Master's degree or EQF7 + 5y IT

Bachelor's degree + 7y IT

Secondary education + 12y IT

Tools

Docker

PostgreSQL

Oracle

MySQL

Kubernetes

OpenAPI/Swagger

Job description

Hello everyone!

We are currently looking for a Senior Back-end Software Engineer (Java / Spring Boot) to join our team.

About us

We are an IT Consulting Group providing innovative digital solutions across Europe.

Learn more: www.altiacompany.com/en

The project

Join an international project focused on the design, development and maintenance of secure, scalable back-end applications and APIs for a major European organisation.

You will contribute to the development of Java-based solutions, implementation of business logic, integration with external services and optimisation of database performance. The role also involves API security, automated testing, CI/CD pipelines, cloud deployments and collaboration with international teams.

Requirements

• Master's degree or equivalent (EQF Level 7) + 5 years of IT experience; OR Bachelor's degree (EQF Level 6) + 7 years of IT experience; OR secondary education + 12 years of IT experience.
• Minimum 3 years of professional experience in IT systems within the Mobility/Transport and/or Energy sectors.
• English B2 or higher, both written and spoken.
• 5+ years of professional experience with Java, Spring Boot, RESTful web services, relational databases (PostgreSQL, Oracle or MySQL) and containerisation technologies, particularly Docker.
• Strong knowledge of back-end application architecture, business logic and scalable software design.
• Experience designing, developing and documenting REST APIs, ideally using OpenAPI/Swagger.
• Knowledge of database performance optimisation, query design and indexing.
• Experience integrating back-end applications with front-end components and external services.
• Knowledge of API security, including input validation, authentication, authorisation, token management and access control.
• Experience with automated unit and integration testing.
• Knowledge of CI/CD practices and pipelines.
• Experience with Docker and fundamentals of cloud deployments, serverless technologies and managed Kubernetes.
• Knowledge of monitoring, logging, troubleshooting and continuous improvement.

What we offer

• International and multicultural environment.
• Opportunity to work with a major European organisation.
• Challenging projects involving modern back-end and cloud technologies.
• Career growth opportunities.

This job offer has been drafted with impartiality and non-discrimination on the basis of gender, race, ideology or any other grounds in mind. In particular, it complies with current regulations on gender equality between women and men (Royal Decree-Law 6/2019).