Back-End/API Developer

At Quento, the ICT arm of the Qualco Group, we deliver comprehensive and innovative solutions across AI, Digital Engineering, Cloud, and Cybersecurity, helping businesses accelerate digital transformation. With a presence in Greece, Luxembourg, and Belgium, and backed by the expertise of the Qualco Group, we combine deep technical knowledge with strategic partnerships to support business growth.

At Quento, we empower our people to innovate and lead in delivering transformative ICT solutions to our clients worldwide. Quento Technologies seeks a highly motivated and experienced Back-End/API Developer.

Responsibilities:

• JJava Development:
• Developing vendor-agnostic portable applications
• Spring Boot:
• Developing back-end applications.
• Integrating Spring Boot applications with external services
• API Development:
• Developing and integrating Java APIs, especially with RESTful services.
• Credential Management:
• Securing applications and using secrets management tools like Hashicorp Vault.
• Dependency Management:
• Using Maven to manage Java project dependencies.
• Database Integration:
• Working with databases (PostgreSQL)
• Integrating and configuring databases, e.g. Liquibase or similar
• Containerization:
• Containerizing applications with Docker, ideally with solutions compatible with cloud-agnostic environments.
• Messaging Platforms:
• Integrating Kafka distributed event systems for asynchronous contexts.
• Centralized management of data schemas in distributed events context.
• Continuous Integration/Continuous Deployment (CI/CD):
• Following CI/CD practices for automated testing, integration, and deployment.
• Using GIT code repositories and delivery processes
• Licensing and Compliance:
• Working with licensing and compliance aspects and constraints of integrated components and dependencies.
• Testing and Validation:
• Testing and validation of application changes
• Back-end testing with tools such as JUnit, Mockito, Postman, and Testcontainers
• Documenting and Communication:
• Documenting code and system configurations.
• Communication and collaboration with other teams and stakeholders.
• Cloud Platforms & Monitoring:
• Development and integration of AWS, Azure, or GCP.
• Implementing services using SaaS and CaaS hosting.
• Integrating monitoring and logging tools such as the  ELK stack.
• Monitoring Kafka-based data flows
• Agile & Collaboration:
• Working in Agile/Scrum environments.
• Using tools like Jira, Confluence, Sharepoint and Teams for team collaboration.

• University degree in Information Technology or Computer Science or Computing;
• At least 8 years of experience in Java 8 to 21;
• At least 7 years of experience in XML, HTML as data formats and JSON;
• At least 7 years of experience in Dependency management with Maven;
• At least 7 years of experience in SQL;
• At least 5 years of experience in Spring Boot framework for developing back-end applications;
• At least 5 years of experience in developing and integrating RESTful APIs;
• At least 5 years of experience in backend testing tools such as JUnit, Mockito, Postman, and Testcontainers, or similar;
• At least 5 years of experience in SaaS and CaaS hosting services;
• At least 5 years of experience in monitoring and logging tools such such as the ELK Stack, designing dashboards;
• At least 5 years of experience in Agile/Scrum environments;
• At least 5 years of experience in Atlassian suite (Jira, Confluence);
• At least 5 years of experience in documenting code and configuration;
• At least 4 years of experience in securing applications under security standards (SSDF, NIST 800-53);
• At least 3 years of experience in designing and developing of vendor-neutral, cloud-portable applications using open standards;
• At least 3 years of experience in Apache Kafka for asynchronous event-driven processing;
• At least 3 years of experience in Centralized management of Kafka data schemas (e.g. Schema Registry);
• At least 3 years of experience in CI/CD practices for automated testing, integration, and deployment;
• At least 3 years of experience in GIT code repositories and delivery processes;
• At least 3 years of experience in writing analysis documents;
• At least 3 years of experience in writing installation instructions and other technical guides;
• At least 2 years of experience in using secrets management tools like Hashicorp Vault;
• At least 2 years of experience in RDF, knowledge graphs, triple stores;
• At least 2 years of experience in Developing containerized applications (Docker);
• At least 1 year of experience in GraphQL;
• At least 1 year of experience in WSO2 API Gateway or similar;
• At least 1 year of experience in Cloud-agnostic environments;
• At least 1 year of experience in monitoring and troubleshooting Kafka-based data flows and consumer performance;
• At least 1 year of experience in managing licensing and compliance aspects of integrated components and dependencies;
• At least 1 year of experience in microsoft Sharepoint and Teams for team collaboration;
• Excellent knowledge of the English language and good knowledge of French language.

This role is an on - site opportunity in Luxembourg.

CV submitted in English.

Your race, gender identity and expression, age ethnicity or disability make no difference in Quento we want to attract, develop, promote, and retain the best people based only on their ability and behavior.

Disclaimer: Quento collects and processes personal data in accordance with the EU General Data Protection Regulation (GDPR). We are bound to use the information provided within your job application for recruitment purposes only and not to share these with any third parties. For more details on the processing of your personal data during the Recruitment procedure, please be informed in the Recruitment Notice, before the submission of your application.