Senior Backend Engineer, 1Komma5°
Heartbeat AI
Carbon-neutral infrastructure for homes
Job no longer available
Carbon-neutral infrastructure for homes
1001+ employees
Job no longer available
1001+ employees
Company mission
To bring the technologies that will contribute to the energy transition to people efficiently and cheaply.
Role
Who you are
- 5+ years as a backend or fullstack engineer, with strong expertise in TypeScript/Node.js
- 2+ years in a lead, staff, or senior engineer role, driving architectural initiatives
- Strong experience with system and data integration, especially CRM, payment systems, or subscription/billing platforms
- Deep understanding of contract-based workflows, state management, and event-driven systems
- Experience with regulated industries (energy, fintech, healthcare, or similar) and understanding of compliance requirements
- Experience designing and maintaining microservices at scale on cloud platforms (GCP preferred)
- Strong skills in API design, versioning, and data modeling
- Understanding of GDPR and data privacy regulations
- Excellent communication and leadership skills — able to balance hands-on delivery with technical strategy
- Fluent in English; German is a plus
Desirable
- Experience in the energy, IoT, or utility sector
- Background with billing systems or contract automation
- Familiarity with Domain-Driven Design (DDD) and clean architecture
- Exposure to data quality management and compliance processes
What the job involves
- As Senior Backend Engineer (Typescript) – Heartbeat AI (m/f/d), you will own the technical architecture behind how we manage, automate, and connect contracts and energy partner integrations across the Heartbeat AI platform
- Your focus will be on backend systems, ensuring that customer and energy contracts are reliably integrated with our payment and CRM systems to support scalable post-booking, activation, and billing workflows
- You will work with a cross-functional team of 10 (Product Manager, Designer, Backend Engineers, Frontend, Mobile) and work closely with other product and platform teams to evolve our distributed architecture and integration landscape
- Lead Architecture: Design and evolve the contract lifecycle, covering creation, activation, provisioning, cancellation, and optimization flows
- Drive Systems Integration: Own the technical strategy for connecting contract services with payment, CRM, and external energy partner APIs using asynchronous event-driven patterns (Pub/Sub, message queues, webhooks)
- Collaborate Across Domains: Work closely with Product, Design, and Platform teams to ensure contract and partner data flows are consistent and reliable across systems
- Ensure Data Quality & Observability: Implement robust validation, monitoring, and tracing for integrations with external systems and internal services
- Mentor and Guide Engineers: Coach team members in software design, integration best practices, and clean architecture principles
- Contribute as SME: Act as Subject Matter Expert (SME) for the Contract Management domain: reviewing PRs, documenting core system behavior, and ensuring technical decisions align with the broader platform vision
- Reliability: Balance architectural vision with hands-on implementation, ensuring scalable, maintainable, and production-ready solutions
Our take
As individuals and communities look to lower the carbon footprints of their buildings and homes, there is a need to access products and infrastructure that will enable them to adopt more eco-friendly energy practices. 1KOMMA5° is building a "one-stop shop" for sales, installation and services related to solar, power storage, and EV charging infrastructure, simplifying the energy transition for carbon-conscious people.
1KOMMA5°'s offerings include the energy manager "Heartbeat", a free-to-use platform that can be accessed on mobile, and helps users to make the most out of their self-generated electricity. The company is also building a group of experienced specialist companies that it aims to support in aiding the clean energy transition, not only by investing in them but by granting them access to its operational experience to help them further develop.
A 2024 surge in revenue and profitability (leading to the company's unicorn status in 2023) underscores the market's confidence in 1KOMMA5°'s transformative potential. With a clear trajectory towards exponential growth, fueled by ambitious revenue targets and strategic investments in product development, the company is poised to redefine the energy sector.
Freddie
Company Specialist at Welcome to the Jungle
Insights
248% employee growth in 12 months
Company
Funding (2 rounds)
Jun 2020
$3.3m
SEED
Jul 2018
$1.1m
SEED
Total funding: $4.4m
Company benefits
- You have the opportunity to work in our brand new offices in downtown Hamburg and Berlin and/or remotely
- Use your technical equipment outside of work in your free time
- You are part of a fast-growing company with a lot of development potential , where you can build something independently and feel your impact
- Work in flat hierarchies , take on responsibility during your induction and work directly with parts of the management
- With your work, you support the megatrend “energy and mobility transition” and make a concrete contribution to the sustainable restructuring of our energy infrastructure
- Be active and use the offers of over 7,600 sports partners with the EGYM Wellpass
Company HQ
Hamburg-Neustadt, Hamburg, Germany
Leadership
Philipp Schröder
(Co-Founder & CEO)Co-founder and former CEO of CAPinside.com. Has previously worked as Managing Director at sonnen, and Country Director at Tesla.
Michael Hinderer
(Co-Founder & Chairman of the Board)Senior Advisory Partner at Castik Capital. Co-founded GCA Altium, and was a Founding Partner for Corporate Finance Partners Holding and Apax.
Philip Liesenfeld
(Co-Founder & COO)Was Managing Director at wiwi Fondsmanagement. Worked in several roles at juwi Group including Regional Manager and Project Manager.
Jannik Schall
(Co-Founder & CPO)Former VP of Global Product at sonnen. Worked in Sales & Marketing at Tesla.
Micha Grueber
(Co-Founder & CFO)Former CFO at CAPinside. Previously Commercial Manager at SABIO.
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