Python Back-End Software Engineer Senior

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!