1KOMMA5°

Principal Software Engineer (m/f/d)

Berlin, Germany full-time Mid Salary not listed
full-time Mid level Technology & IT Curated
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About the role

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!

Deine PositionShape the organisation's technical strategy and innovation efforts

Accountable for consistent execution of technical decisions by setting clear direction and holding teams accountable for implementation

Ensure continuously that our software architecture is shaped in close alignment with product management to support current and future product direction

Lead architectural direction to enable the delivery of scalable, maintainable, and state-of-the-art solutions

Translate business requirements into technical solutions

Tackle and resolve deep technical challenges with urgency and precision

Mentor and challenge engineers to accelerate their professional growth

Build and scale a high-performance tech organisation and engineering culture

Embed security and reliability as direct customer value

Architect our systems and APIs so AI agents operate as first-class users with machine-readable contracts and structured errors that let agents self-correct

Drive the org's transformation to agentic engineering, reshaping how teams work so agents execute safely while humans stay accountable

Dein ProfilShape the organisation's technical strategy and innovation efforts

Accountable for consistent execution of technical decisions by setting clear direction and holding teams accountable for implementation

Ensure continuously that our software architecture is shaped in close alignment with product management to support current and future product direction

Lead architectural direction to enable the delivery of scalable, maintainable, and state-of-the-art solutions

Translate business requirements into technical solutions

Tackle and resolve deep technical challenges with urgency and precision

Mentor and challenge engineers to accelerate their professional growth

Build and scale a high-performance tech organisation and engineering culture

Embed security and reliability as direct customer value

Architect our systems and APIs so AI agents operate as first-class users with machine-readable contracts and structured errors that let agents self-correct

Drive the org's transformation to agentic engineering, reshaping how teams work so agents execute safely while humans stay accountable

BenefitsYou are part of an international, dynamic, and highly motivated team of people who have proven to make things happen
With your work, you accelerate the "energy transition" and hence have a direct impact on our climate
Work with and learn from other super-smart colleagues
You will enjoy direct contact with core decision-makers
You will enjoy the best chances of entering full-time in one of Europe’s most thriving scaleups
You work remotely (Germany-wide), with offices in Hamburg, Berlin or Munich
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
Individualised opportunities for professional development
Reporting directly to the CTO

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Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid
Technology & IT Data Analysis Principal Software Engineer Technology Mid level

Likely questions

  1. Tell us about work you have done that is close to the Principal Software Engineer (m/f/d) role.
  2. How would you approach your first 30 days at 1KOMMA5°?
  3. Which of Data Analysis, Principal and Software have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with Data Analysis, Principal and Software.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Principal Software Engineer (m/f/d) role because I can bring practical experience in Data Analysis, Principal and Software, learn the team quickly, and contribute to the outcomes 1KOMMA5° needs from this hire.

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