English - Senior Software Engineer* TypeScript

At 1KOMMA5°, we are building Europe’s leading clean energy operating system — connecting solar, heat pumps, energy storage, and charging into one unified platform.

As Senior Software Engineer for Contract Lifecycle Platform, 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.

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).

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.

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.

Balance architectural vision with hands-on implementation, ensuring scalable, maintainable, and production-ready solutions.

NestJS (TypeScript), Node.Microservices, Event-driven design (Pub/Sub, queues), REST/GraphQL APIs

DevOps & CI/CD: GitHub Actions, Datadog, Infrastructure as Code

Frontend (for integration context): js, Flutter

5+ years as a backend or fullstack engineer, with strong expertise in TypeScript/Node.Strong experience with system and data integration, especially CRM, payment systems, or subscription/billing platforms

• Experience with regulated industries (energy, fintech, healthcare, or similar) and understanding of compliance requirements
• 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

Bonus points for:

Exposure to data quality management and compliance processes

Benefits

You move in flat hierarchies and have short decision-making paths. You are part of the energy transition and recognize in your daily work what purpose it serves

You 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

We created an easy one-stop-shop to buy and install solar, charging stations and heat pumps, with the purpose of liberating all European homes from the shackles of fossil fuels.