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June 24, 2026
Senior Python Developer
Senior • Remote
160 - 210 PLN
Berlin, BE, Germany
Location: 95% Remote | 5% Onsite (Berlin)
Start Date: July 2026
Contract: Until December 2026 with possible extension
Contract Type: B2B
We are looking for an experienced Senior Python Developer to join an international energy sector project for one of Germany’s leading electricity transmission system operators. You will be responsible for maintaining, modernising and extending Python-based applications supporting critical operational processes, including data processing, reporting, load management and system operations.
Responsibilities
- Develop and maintain Python web applications
- Analyse and resolve production issues
- Monitor application performance and review logs
- Implement new features and enhancements
- Troubleshoot and fix software defects
- Work with Git repositories, pull requests and code reviews
- Create and execute test cases
- Deploy applications to OpenShift environments
- Prepare technical documentation and diagrams
- Collaborate with business stakeholders and infrastructure teams
Requirements
- 5+ years of commercial experience with Python
- Strong experience with Flask
- Strong experience with Dash
- Strong experience with Pandas
- Strong experience with NumPy
- Experience processing data from SQL databases, CSV files and multiple external data sources
- At least 1 year of hands-on experience with Kubernetes, OpenShift and Helm Charts
- Experience designing scalable and reliable systems
- Understanding of performance optimisation and data consistency
- Experience working with Git and CI/CD environments
- German language skills at C1 level or higher
Nice to Have
- FastAPI
- React
- Energy market experience
- Electrical engineering knowledge
- Experience working directly with business stakeholders
What We Offer
- Project in the energy sector
- Flexible remote work model
- Opportunity to work on mission-critical systems supporting energy infrastructure
- International environment
- Possibility of project extension
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