Python Back-End Software Engineer Senior

Employment: Full-Time About Cronos Europa Cronos Europa is a leading IT and digital transformation partner dedicated exclusively to European Institutions and agencies, delivering mission-critical solutions that shape Europe's digital future. As part of the Cronos Group, one of the most innovative and fastest-growing tech ecosystems in Europe, we benefit from a vast pool of expertise and cutting-edge capabilities. With over 1,000 specialists across Belgium, Luxembourg, and the Netherlands, we combine deep institutional knowledge with strong engineering excellence to support long-term, high-impact EU programmes requiring reliability, scalability, and innovation. About the job We are looking for a Python Back-End Software Engineer to design, develop, secure and maintain robust server-side components supporting mission-critical web applications. The role focuses on building scalable back-end services, integrating systems through APIs, optimising databases and supporting reliable delivery in cloud-based environments. Responsibilities Architect server-side components and services that form the backbone of web applications, employing best practices in Python programming. Develop and maintain RESTful APIs to facilitate seamless communication between front-end and back-end systems. Design, implement and optimise database schemas and queries to ensure efficient data storage and retrieval processes. Manage database security measures to protect sensitive information, ensuring compliance with data protection standards. Enhance application performance by identifying bottlenecks and optimising server-side code and database queries. Implement scalable architectures to handle increased user load and data volume, leveraging cloud services and containerisation. Conduct regular code reviews and use vulnerability scanning tools to identify and address potential security issues. Implement security protocols and standards to safeguard applications against threats and ensure data privacy. Collaborate closely with front-end developers, UI/UX designers, product managers and other stakeholders to deliver quality web application solutions. Help translate business requirements into technical specifications and adjust implementations based on feedback. Set up and maintain CI/CD pipelines to automate testing and deployments, ensuring consistent and rapid delivery of applications. Participate in deploying applications in cloud environments, using infrastructure-as-code and configuration management tools. Actively engage in debugging and resolving issues raised during testing or reported in production. Write technical documentation. Specific expertise EQF 6 with a focus on Computer Science. Proficiency in Python and experience with web frameworks such as Django, Flask or FastAPI. Experience with code linters and formatters such as pylint, black or flake8. Experience with AI-powered code assistants such as Amazon Kiro or GitHub Copilot. Strong understanding of RESTful design and implementation. Solid experience with relational databases such as Oracle or PostgreSQL and non-relational databases such as Elasticsearch or MongoDB. Excellent knowledge of ORM, schema design and efficient queries. Expertise in containerisation tools such as Docker or Podman and orchestration using Kubernetes. Knowledge of vulnerability scanning tools, secure coding practices and standards, including authentication, authorisation and encryption. Knowledge of code versioning tools such as Git or SVN. Knowledge of DevSecOps tools such as Jenkins, GitLab CI or GitHub Actions. Familiarity with configuration management tools such as Ansible. Experience with VM management and Linux. Good knowledge of the European Commission grant management ecosystem, including eGrants, would be an asset. Skills and competencies Ability to apply rigour and consistency in back-end development practices. Ability to work in a multicultural environment. Ability to participate in multilingual meetings. Ability to understand, speak and write English; French is considered an asset. Talent for building relationships and adapting communication to the audience. Ability to work in a team as well as autonomously. Results-oriented mindset focused on delivery. If you wish to integrate a dynamic structure on a human scale while working with the latest technologies, don't wait anymore and join Cronos!