Software Engineer, German Energy Market Processes
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Job Description
Software Engineer building German Grundversorgung, billing, and EDIFACT market-communication systems. Supporting principal33’s end-to-end energy supplier platform for regulated utility processes.
Responsibilities:
- Design and build platform components for German Grundversorgung and related processes
- Implement contract and supply-status logic, including implicit contracts on move-in, Ersatzversorgung and Grundversorgung states and transitions, supply start/end, move-out, termination, and special termination rights
- Implement billing and pricing logic for general tariffs, price changes, notification deadlines, Abschläge, periodic and final invoices, taxes, levies, and Konzessionsabgabe
- Build market communication flows for GPKE / GeLi Gas, WiM, and MaBiS
- Process and generate EDIFACT messages including UTILMD, MSCONS, INVOIC, REMADV, APERAK, and CONTRL
- Map Prüfidentifikatoren to domain events and keep up with BDEW format releases
- Automate exceptions such as rejected registrations, missing meter readings, switching conflicts, and disconnection orders
- Translate regulations into explicit domain models and tests with domain experts
- Own features from design to production in a small, autonomous team
- Monitor and debug live issues with customer impact
- Improve reliability and performance at scale
- Contribute through code review, pairing, and sharing domain knowledge across teams
Requirements:
- Hands-on engineering experience on German Grundversorgung processes, including experience building or maintaining systems for a Grundversorger, energy supplier, or utility platform
- Ability to explain how Grundversorgung and Ersatzversorgung differ in data and logic
- 3+ years of professional software development experience with a strong backend focus
- Working knowledge of German market communication: GPKE / GeLi Gas, WiM, MaBiS
- Experience with EDIFACT message handling
- Experience with billing or contract systems in the energy sector
- Solid fundamentals in clean domain modelling, relational databases, testing, and collaborative codebases
- Comfortable working in English
- Nice to have: German language skills
- Nice to have: Python and Django
- Nice to have: PostgreSQL, GraphQL, and AWS
- Experience migrating a German utility's customer base between systems such as SAP IS-U, Schleupen, or Wilken
- Exposure to smart metering (iMSys, MsbG), §14a EnWG, or dynamic tariffs
- Experience with event-driven or message-based integration and high-volume batch processing
Benefits:
- Medical insurance: Your health, and your family's, is our top priority. You're fully covered.
- Holiday flat in Valencia
- Gifts for special occasions, including Easter, Women's Day, Father's Day, and more
- Anniversary gifts for 1st, 5th, and 10th work anniversaries
- Team-building events
- End of year celebrations
- Day off on your birthday
- Community and social initiatives
- Unlimited access to thousands of Udemy courses
- German language courses
- Personal and professional growth through masterclasses, courses, and training
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