(Senior) Lab Engineer (m/f/d) in Berlin, Deutschland

1KOMMA5°

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!

Your mission

At 1KOMMA5°, we connect and manage distributed energy devices at scale. As a Lab Engineer, you will build and configure test setups with integrated PV systems, batteries, heat pumps, and EV chargers. Alongside maintaining and calibrating test equipment, you will develop testing procedures for OEM component compatibility within the Heartbeat platform. Your role also involves providing 3rd-level support, documenting procedures and results, offering guidance to lower-level support teams, and contributing to the improvement of testing methodologies at our Berlin lab.

Key responsibilities include but are not limited to:

• Planning and execution of development-related tests with hardware for an integrated energy control platform

• OEM and feature integrations: technical exploration with cross-functional teams; coordination and execution of system integration testing

• Release testing: test conception, coordination, and execution

• Design and construction of test benches; assemble and configure setups that simulate single-home environments (PV, battery, heat pump, EV charger)

• Definition of test KPIs, documentation and evaluation of results

• Develop and improve lab testing software, test automation, methodologies, and procedures

• Guide junior lab engineers in daily tasks and support their technical and professional development through mentoring

Your profile

The successful candidate will have:

• Completed studies in electrical engineering or mechatronics, 4+ years of experience in assembly, testing, or maintenance of electrical systems, preferably in renewable energy

• Elektrofachkraft (EFK) qualification and proficiency reading electrical schematics and technical documentation

• Hands-on experience with multimeters, oscilloscopes, and power analyzers

• Experience collaborating with development, support teams and stakeholders to troubleshoot technical issues

• Valid driver’s license Class B

• Strong documentation skills, with the ability to record and communicate test procedures, results, and best practices

• Fluency in English and German, both written and verbal

Bonus points for:

• Familiar with state of the art AI development using Tools like Claude Code, Cursor and other development tools

We are an ambitious and dynamic company with a talented team. We require our engineers to be imaginative, enthusiastic, and willing to tackle new challenges as we strive to provide everyone with renewable energy technologies.

Benefits

• You are part of a dynamic team with people who prove every day that they can make things happen and move companies forward with great positive impact

• You move in flat hierarchies and have short decision-making paths. You can learn a lot quickly and get involved at different levels

• You will be welcomed by a friendly and familiar team

• You are part of the energy transition and recognize in your daily work what purpose it serves

• You can work in one of our offices in Hamburg, Berlin or Munich

• You create a healthy balance alongside your work and enjoy all the benefits of the EGYM Wellpass

• Benefits and discounts are yours with Futurebens

• Whether city bike or e-bike - be flexible with our job bike leasing and do something good for the environment at the same time

About us

"At 1KOMMA5°, our vision is to accelerate CO2 neutral life for all! We created an easy one-stop-shop to buy and install solar, charging stations and heat pumps, with the purpose of liberating all European homes from the shackles of fossil fuels. With Heartbeat, we make clean energy smarter. Connecting our customers into one powerful clean energy operating system to enable flexible tariffs and to ultimately follow the rhythm of wind and sun!" - Philipp Schröder (CEO 1KOMMA5°)