Principal Software Engineer (m/f/d)

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

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

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

Technologies you will work with include:

AI-assisted development with Cursor and agentic coding workflows

Cloud & Infra: Google Cloud Platform, GKE (Kubernetes), Cloud Run, Terraform/IaC, Vercel

Messaging & IoT: Eclipse Hono, MQTT, Mender

Data & BI: PostgreSQL, BigQuery, SQLMesh, Looker

Observability: Datadog, OpenTelemetry

Languages: TypeScript (Nest.js), Java, Go, Flutter, Ruby on Rails

DevOps: CI/CD pipelines (GitHub Actions)

Linear, Notion, Figma, Miro

Your profile

Extensive hands-on experience in software development with multiple general-purpose programming languages for a minimum of 5 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

Experience 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

Experience designing systems and APIs for agent consumption, with structured errors and clear contracts that let agents self-correct

Capability to guide an engineering team through the shift to agentic engineering, reshaping workflows so agents execute safely while humans stay accountable for every outcome

Strong verbal and written communication skills in English, with proficiency in German considered a plus

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 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

Find Jobs in Germany on Arbeitnow