Working Student Product Operations: PV & Heat Pump Modeling (m/f/d)

Why re-green?

re-green's mission is to free all German large office buildings from their CO₂ footprint. The real estate industry is responsible for 40% of German energy consumption and 36% of all CO₂ emissions. Without affordable decarbonization of commercial real estate, achieving the 2-degree target is impossible – what we do matters!

re-green offers owners energy-efficient renovation services without them having to invest. Our conviction: Every large building will become a small energy company in the future. re-green develops and implements a standardized product bundle of heat pumps, photovoltaics, and batteries – combined with its own planning software and a prefabricated container approach.

Your Tasks

For this, we are looking for a working student (m/f/d) to manage and further develop re-vive, our planning software for heat pumps and photovoltaics, with AI-supported development.

Sales, Engineering, and Finance plan, evaluate, and finance every project with it.

Further Development & Maintenance of re-vive

Implementation of improvement requests and new features from requirements to release. Experience in bug fixing, AI-supported development with Next.js, TypeScript, and SQL is a nice-to-have. What's important is that you enjoy self-directed learning, taking on responsibility, and working on high-quality digital products.

Verification of Billing Logic

Plausibility checks of results against quotes, financial models, and real operating data, building automated tests, identification and resolution of discrepancies – from heating load and annual performance factor to CAPEX and OPEX, cash flow, IRR, and DSCR.

Product & Collaboration

Gathering requirements from Sales, Engineering, and Finance, further developing the price book and standard assumptions together with the Product Lead, documenting calculation rules and release notes.

What You Bring

You are enrolled as a working student, have a strong interest in renewable energies, and quickly get to grips with complex data structures.

Currently studying Computer Science, Business Informatics, Industrial Engineering, Mathematics, Physics, Energy Technology, or a comparable field. We are open to interested candidates from other study programs.

Experience with code and SQL – ideally with your own projects

Experience or interest in one or more of these areas:

o AI-supported software development

o Web development (Next.js, TypeScript) and databases

o Investment and profitability analysis

o Financial modeling or Excel modeling

o Heat pumps, heating load, and photovoltaics

o Electricity price components, grid fees, and levies

o Workflow automation (e.g., n8n)

Thoroughness: You verify AI results instead of blindly trusting them

Desire to take responsibility and build things yourself

Your Start with Us

In the first few months, you will familiarize yourself with our energy modeling and support operational processes in the implementation of our photovoltaic and heat pump projects. Those who meet most of the requirements should apply directly.

Compensation and Additional Benefits

The compensation for this working student position is EUR 17–18 per hour. You will receive reimbursement for travel expenses for your commute.

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