Working Student - Energy Invoice Quality & Automation

At ecoplanet, we’re redefining energy for tomorrow. Our mission: turn energy management into the competitive edge every European business relies on to win its market. We’re building the operating system for the energy transition - cutting energy costs, improving efficiency, and streamlining operations. Backed by EQT Ventures, HV Capital and more, and built by a team full of top-tier talent.

Why This Role Matters

Energy invoices are where money quietly leaks: wrong prices, wrong billing periods, wrong grid fees. You will own the checks that catch those errors, find out why they happen, and turn every pattern you find into a better product. Small team, real ownership, and your findings reach the product quickly.

What You’ll Achieve

• Invoice checking. Own the regular checks of energy supplier and grid operator invoices against contracts, meter data and our own calculations, and flag errors
• Root causes. Investigate mismatches (prices, consumption, grid fees, taxes and levies, billing periods) until you know why they happened, and document recurring error patterns so they feed into product improvements
• Automation. Replace manual checks with SQL queries and Python scripts
• Product improvement. Work with Product and Solution Engineering to improve our invoicing logic: write clear bug reports, test new features and onboard new customers’ data
• Scalable processes. Build templates, checklists and documentation so the process can scale

• Currently in a late Bachelor’s (4th semester or higher) or a Master’s in Informatics, Engineering, Energy, or Business with a technical focus (Wirtschaftsingenieurwesen, TUM-BWL, etc.)
• Solid to advanced SQL, including JOINs and aggregations, and ideally window functions or CTEs
• Good Python skills: you can read, understand, improve and run small scripts and tooling, or enable yourself with AI tools (Claude Code, Codex, etc.)
• First experience supercharging your work with AI tools like Claude or Codex, going beyond basic research prompts
• Strong Excel and/or Google Sheets skills, including complex formulas and templates
• A precise, structured way of working, an eye for numbers that don’t add up, and the drive to dig until you find the root cause
• Motivation to dig deep into the invoicing logic of our software and of energy contracts and invoices in general
• Fluent German (energy invoices and supplier communication are in German) and English

Nice to have:

• Work experience in the energy sector (supplier, grid operator, energy management)
• Familiarity with German energy price components (Netzentgelte, Konzessionsabgabe, Stromsteuer, Umlagen) or load profiles (RLM/SLP)
• Experience with automation tools like n8n or Zapier (or the wish to learn them)

• Real ownership from day one - you own processes end to end, not busywork
• Direct impact - your work helps companies cut energy costs and CO emissions
• Fast-growing, post-Series A startup - short decision paths, little bureaucracy, room to shape how we work
• Close collaboration with Operations, Product and Engineering - plus regular feedback and mentoring
• Hands-on learning across energy market processes, data, automation and modern tooling (n8n, Airtable, SQL, Python, Claude and more)
• Flexible hours that fit around your lectures and exams, plus a hybrid setup
• Modern office in central Munich - coffee, drinks and snacks included
• Team events - regular team lunches and an annual offsite (Italy, Austria, etc.)
• Competitive pay

Our mission: Energy is one of the biggest cost levers today - we turn it into a competitive advantage. With ecoplanet, energy purchasing, consumption optimization and consulting become a clear system - for maximum cost reduction, higher efficiency and full security of supply.