Principal Software Engineer (m/f/d)

Join to apply for the Principal Software Engineer (m/f/d) role at 1KOMMA5°.

We are looking for you to join our tech team in Berlin, Munich, or Hamburg. 1KOMMA5° is creating Germany's largest one-stop-shop for the sale, installation, and servicing of solar panels, heat pumps, electricity solutions, and charging infrastructure—all interconnected.

Become a part of our mission and learn about our Product & Tech team.

Your mission

In tech, we have two main work streams:

• Heartbeat: Building a virtual power plant leveraging our energy manager “Heartbeat” and evolving the customer experience app.
• Operating System for installation companies: Digitisation of operations and processes from ground operations to rooftop installations.

Key responsibilities include but are not limited to:

• Shape 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.

Technologies you will work with include:

• Typescript/JavaScript/NodeJS (VueJS/NestJS)
• Ruby on Rails
• Flutter (Dart)
• Google Cloud Platform
• Terraform
• GitHub Actions
• IoT applications

Your profile

You have:

• Extensive hands‑on experience in software development with multiple general‑purpose programming languages for a minimum of five years.
• A proven track record of architecting scalable and secure systems, demonstrating a strong commitment to quality.
• Extensive experience in designing and implementing APIs that enable seamless integration and system communication.
• An agile and result‑oriented mindset, with a strong emphasis on collaboration and teamwork.
• Expertise in communicating with stakeholders in business terms and understanding the technical implications of their requirements.
• Industry‑leading experience driving cross‑functional teams and enforcing engineering alignment in fast‑paced environments, including making and following through on critical technical decisions.
• Excellent verbal and written communication skills in English, with proficiency in German considered a plus.
• Bonus points for:
  • Experience with IaC (ideally Terraform)
  • Interest in climate tech industry

Benefits

• You 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 scale‑ups.
• 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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