Job Title: Senior Python Developer (Development Service)

Duration: ASAP - 31/12/2027

Location: Brussels, Belgium (Hybrid, 2 days per week on-site)

Languages: English & (French or Dutch)

Key Responsibilities:

- Collaborate actively to the development and optimization of Python-based software applications.
- Collaborate with stakeholders to gather requirements and define software specifications.
- Engage with customers to address service request and ensure effective resolution.
- Implement best practices for code quality, testing, and deployment (CI/CD).
- Mentor junior developers and conduct code reviews.
- Troubleshoot, debug, and resolve complex technical issues.
- Work with DevOps and data engineering teams to ensure seamless integration and performance.
- Ensure security, scalability, and maintainability of solutions.

Required Skills & Experience:

- 6+ years of experience in Development.
- 3+ years of experience using Python.
- Strong understanding of IT security requirements and their implementation ideally in the context of critical infrastructure
- Proficiency in Python for backend services, preferably with FastAPI or similar frameworks.




- Proficiency with data validation lib as Pydantic.
- Experience with AsyncIO.
- Experience in SQL.
- Experience with databases like MSSQL, PostgreSQL.
- Experience with RabbitMQ.
- Strong understanding of service-based architectures and event-driven systems
- Solid conceptual knowledge of software design patterns, scalability, and continuous integration practices
- Knowledge of test automation frameworks (e.g Selenium)
- Solid understanding of software design patterns, data structures, and algorithms.
- Strong problem-solving skills and attention to detail.
- Ability to mentor and provide technical leadership.
- Experience working in agile environments.
- Excellent communication and collaboration skills.
- Experience with Azure cloud is a plus.
- Experience in NoSQL solutions is a plus.
- Ability to work with legacy code and participate to refactoring initiative.
- Familiarity with containerization using Docker and deployment pipelines in a CI/CD environment is a plus.

📌 Python developer (España)
🏢 Onesource Consulting
📍 España