Senior Backend Engineer (Typescript) – Heartbeat AI (m/f/d)

1KOMMA5°; Berlin; Vor Ort; EUR 70.000 - 90.000; Vollzeit

Zusammenfassung

A leading clean energy company in Berlin is looking for a Senior Software Engineer to lead the architecture of their Contract Lifecycle Platform. You will work with backend systems and integrate contracts with payment and CRM systems, ensuring reliable workflows. The ideal candidate has over 5 years of experience in backend development, with strong skills in TypeScript and Node.js. This position offers a dynamic environment within a mission-driven team.

Leistungen

Dynamic team environment

Flat hierarchies

Benefits and discounts with Futurebens

Job bike leasing for environment

Qualifikationen

• 5+ years as a backend or full-stack 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.

Aufgaben

• Design and evolve the contract lifecycle, covering creation, activation, and optimization flows.
• Own the technical strategy for connecting services with payment and CRM systems.
• Implement robust validation, monitoring, and tracing for integrations.

Kenntnisse

TypeScript

Node.js

Microservices

API design

Event-driven systems

Data integration

Leadership

Communication

Tools

PostgreSQL

Google Cloud Platform

GitHub Actions

Jobbeschreibung

Senior Software Engineer (Typescript) – Contract Lifecycle Platform, Heartbeat AI (m/f/d)

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 and collaborate with other product and platform teams to evolve our distributed architecture and integration landscape.

Your mission

• 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 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

Your profile

• 5+ years as a backend or full‑stack 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
• Exposure to data quality management and compliance processes

Benefits

• You are part of a dynamic team with people who prove every day that they can make things happen and move companies forward with great positive impact
• You move in flat hierarchies and have short decision‑making paths. You can learn a lot quickly and get involved at different levels
• You will be welcomed by a friendly and familiar team
• You are part of the energy transition and recognize in your daily work what purpose it serves
• You can work in one of our offices in Hamburg, Berlin or Munich
• 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

If you read this to the end, include the word “rubberduck” in your application.

About Us: “At 1KOMMA5°, our vision is to accelerate CO2 neutral life for all! 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. With Heartbeat, we make clean energy smarter. Connecting our customers into one powerful clean energy operating system to enable flexible tariffs and ultimately follow the rhythm of wind and sun!” – Philipp Schröder (CEO)