Working Student Finance & Controlling (m/f/d)

At 1KOMMA5°, we pursue a clear vision: Living on wind and sunlight forever for free. To make this a reality, we are building the energy system of the future with Heartbeat AI. Want to be part of it?

We bring together regional craftsmanship and scalable software: We don't think of solar, batteries, heat pumps, and e-mobility as isolated components, but control them as an intelligent, integrated overall system in our virtual power plant. Directly connected to the electricity market – in real time, fully automated. This way, energy is used when it is available from renewables and particularly cost-effective. By 2030, our goal is to transition 1.5 million households to renewable energies. Over 3,000 people are working towards this every day, at more than 80 locations worldwide, from Finland to Australia.

Want to take responsibility and build solutions that truly matter? Apply now and help us shape the energy world of tomorrow.

Learn more about our Product & Tech team!

As a member of our Finance Team, you work directly with the CFO of Heartbeat AI GmbH and play a pivotal role in shaping the financial foundation of a fast-growing tech company committed to revolutionizing the global energy sector. In your role you will:

• Support financial planning & investor relations: You will assist in calculating and preparing financial scenarios for investors, helping to communicate the company's financial outlook clearly and compellingly
• Own real finance responsibilities from day one: You will support the monthly closing process (Monatsabschluss) of a scaling tech company, gaining hands-on experience across accounting, controlling, and reporting
• Drive financial insight across the business: You will work closely with internal stakeholders to build financial models, evaluate cost and revenue structures, and translate numbers into actionable recommendations

We are always looking to expand our team with highly motivated individuals and are open to applications from candidates with different backgrounds. Let us figure out together how we can best leverage your skills! We are looking for a candidate with the following qualifications:

• You are currently enrolled in a degree program (ideally Finance, Accounting, Business Administration, or a related field) and have at least 20 hours/week of availability
• You are a motivated individual with a strong interest in finance, numbers, and building things that scale
• You have experience in and enjoy working with Google Sheets/Excel to build and maintain financial models, scenarios, and reports
• You have experience in and enjoy working with Google Slides/PowerPoint to create clear, concise presentations that communicate financial outcomes to senior stakeholders
• You have excellent language skills in both English and German (C1/C2) and are comfortable communicating across finance, product, and leadership teams
• You are detail-oriented, structured, and able to manage multiple workstreams while maintaining accuracy under tight deadlines
• You are a problem solver who can adapt quickly in a dynamic, fast-paced environment
• Relevant experience in finance, controlling, consulting, or a related area is a plus
• Previous exposure to the energy market or a tech startup is a plus but motivation matters most