Working Student – Energy Invoice Quality & Automation (m/f/d)

What we are building

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

What Sets You Up for Success

Must have:

• 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)

Logistics:

• Hours: 16–20 hours per week during the semester, more during semester breaks
• Start: ASAP
• Location: Munich, hybrid (3 days in the office)

How You’ll Grow

What You Get

• Real ownership from day one — you own processes end to end, not busywork
• Direct impact — your work helps companies cut energy costs and CO₂ 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

The Application

Don’t meet every requirement? Apply anyway
Nobody ticks every box. If this role excites you and you match most of what we’re looking for, we’d love to hear from you.

About us

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.