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Urgent! Senior Software Engineer (Typescript) – Contract Lifecycle Platform, Heartbeat AI (m/f/d) Position in Berlin - 1Komma5° GmbH
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.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.
Technologies you will work with:
Backend: NestJS (TypeScript), Node.js, Prisma, PostgreSQL
Architecture: Microservices, Event-driven design (Pub/Sub, queues), REST/GraphQL APIs
Integrations: CRM, Payment, Energy Partner APIs
Infrastructure: Google Cloud Platform (Cloud Run, CloudSQL, BigQuery), Terraform
DevOps & CI/CD: GitHub Actions, Datadog, Infrastructure as Code
Frontend (for integration context): React, Next.js, Flutter
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
Bonus points for:
Experience in the energy, IoT, or utility sector
Background with billing systems or contract automation
Familiarity with Domain-Driven Design (DDD) and clean architecture
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Great news! 1Komma5° GmbH is currently hiring and seeking a Senior Software Engineer (Typescript) – Contract Lifecycle Platform, Heartbeat AI (m/f/d) to join their team. Feel free to download the job details.
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An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at 1Komma5° GmbH adheres to the cultural norms as outlined by Expertini.
The fundamental ethical values are:The average salary range for a Senior Software Engineer (Typescript) – Contract Lifecycle Platform, Heartbeat AI (m/f/d) Jobs Germany varies, but the pay scale is rated "Standard" in Berlin. Salary levels may vary depending on your industry, experience, and skills. It's essential to research and negotiate effectively. We advise reading the full job specification before proceeding with the application to understand the salary package.
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