[Hiring] Staff Engineer - Heartbeat AI @1KOMMA5°

Role Description

Own technical direction across Heartbeat AI's engineering domain (Mobile Apps, Energy Data, IoT Platform, and beyond), keeping architecture aligned with product direction.

• Accountable for consistent execution of technical decisions within your domain, setting clear direction and holding the team accountable for implementation.
• Set the technical bar for the team, stepping into the hardest problems yourself rather than just directing others.
• Translate business and product requirements into technical solutions.
• Mentor and challenge engineers within Heartbeat AI to accelerate their growth.
• Build a high-performing engineering culture within the Heartbeat AI team.
• 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 Heartbeat AI's shift to agentic engineering, reshaping how the team works so agents execute safely while humans stay accountable.
• Own the architecture of the AI systems that power the product itself, from our EMS to our energy tariff.

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, Next.js), Java, Go, Flutter.
• DevOps: CI/CD pipelines (GitHub Actions).
• Linear, Notion, Figma, Miro.

Qualifications

• 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.
• Experience driving technical alignment within a team 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.
• Experience architecting AI/ML-driven or data-intensive systems (e.g. forecasting, real-time data pipelines), ideally in an energy or IoT context.
• 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.

Company Description

Die 1KOMMA5° Gruppe ist ein CleanTech Unicorn mit der Mission alles zu elektrifizieren und über unsere KI-basierte Software Plattform Heartbeat AI jeden an den Strommarkt der Zukunft anzuschließen. Wir sind das marktführende Unternehmen für die Installation von CO2-neutralen Energiesystemen, insbesondere bei Photovoltaik, Energiespeicher, Wallbox, Wärmepumpe und Energiemanagement. 1KOMMA5° vereint die besten Unternehmen Deutschlands, Europas und darüber hinaus – wir wachsen weiter und das weltweit.