# Principal Software Engineer (m/f/d) at 1KOMMA5° > Open job at 1KOMMA5° in Berlin, Hamburg, Munich, Germany. Workplace: Remote (Germany). Source: Germany Dev Jobs, https://germanydevjobs.com/jobs/1komma5-principal-software-engineer-m-f-d-p2ows93 Posted 29 July 2026. Last checked on the employer's career site: 10 November 2026. ## Facts - Company: [1KOMMA5°](https://germanydevjobs.com/companies/1komma5) - Location: Berlin, Hamburg, Munich, Germany - Workplace: Remote (Germany) - Employment type: Full-time - German: Not required - English: Business level - Skills: BigQuery, Figma, Flutter, GitHub Actions, Go, Google Cloud, Java, Kubernetes, Looker, NestJS, PostgreSQL, Ruby, Ruby on Rails, Terraform, TypeScript - Not mentioned in the job post: salary, visa sponsorship, relocation, where you can apply from ## Job description #### 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](https://1komma5.com/de/ueber-uns/jobs/tech/) 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 ## How to apply Apply on the job page, https://germanydevjobs.com/jobs/1komma5-principal-software-engineer-m-f-d-p2ows93: its Apply button opens the employer's own application page. ## More jobs from 1KOMMA5° - [Working Student Lab Engineer - Berlin (m/f/d)](https://germanydevjobs.com/jobs/1komma5-working-student-lab-engineer-berlin-m-f-d-aj4w2hc): 1KOMMA5°, Berlin, Germany. On-site. Posted 22 October 2026. - [(Senior) Product Manager Heartbeat (m/f/d)](https://germanydevjobs.com/jobs/1komma5-senior-product-manager-heartbeat-m-f-d-42mfqjv): 1KOMMA5°, Hamburg, Germany. Remote (Germany). Posted 21 September 2026. - [(Senior) Product Manager Energy (m/f/d)](https://germanydevjobs.com/jobs/1komma5-senior-product-manager-energy-m-f-d-z4dmsdd): 1KOMMA5°, Hamburg, Germany. Remote (Germany). Posted 21 September 2026. - [Working Student Designer (Design System) – Heartbeat AI (m/f/d)](https://germanydevjobs.com/jobs/1komma5-working-student-designer-design-system-heartbeat-ai-m-f-d-rddh6lb): 1KOMMA5°, Berlin, Germany. Remote (Germany). Posted 21 September 2026. - [Head of Security (f/m/d)](https://germanydevjobs.com/jobs/1komma5-head-of-security-f-m-d-090q5sj): 1KOMMA5°, Hamburg, Germany. Remote (Germany). Posted 10 September 2026.