Backend Engineer (Energy & AI)

Role Summary

einklang is the intelligent energy supplier for medium-sized businesses. We reduce the energy costs of industrial and commercial customers by combining energy procurement and intelligent battery storage.

Our heart is einklang OS: the platform that connects battery storage at industrial sites with the electricity markets. Volatile electricity prices therefore turn from a risk into a competitive advantage for our customers.

Specifically for you

You improve our optimization and trading in quick iterations and keep operations stable

You take our solution to the next level and make decisions, even under uncertainty.

You keep an eye on the entire system: from the customer location to the market interface.

You make operations and savings measurable: monitoring, alerting, reporting.

Responsibilities

You sit on the core team of einklang OS together with product and energy experts. The platform combines two worlds:

1. Energy management — forecasting, optimization, battery control
2. Energy procurement — electricity procurement and electricity trading

Only the combination allows us to get the most out of the battery and achieve significantly more savings per location.

Requirements

• What you bring with you
• You want to understand and think about the product and not just complete individual tasks
• You like close collaboration: giving and receiving direct feedback, iterating together instead of perfecting alone
• Experience in building and operating productive backend systems

Python, SQL, containers and a cloud environment (e.g. AWS).

• You work routinely with coding agents and critically check their output: speed without loss of control
• Fluent in German and English
• An advantage, not a must

Nobody brings everything with them. With us you will learn a lot about a wide variety of topics while you already have real responsibility.

• CI/CD, Infrastructure as Code, Monitoring
• Time series data and forecast models
• Energy markets
• Mathematical optimization (LP/MILP, solver)
• Edge and field connection (Modbus TCP, MQTT, IEC 60870-5-104)
• Interested in game theory or trading of any kind
• Experience in a startup: short distances, a lot of personal responsibility

Benefits

• Measurable impact. Every optimized system reduces costs and CO₂. You work on the two crucial levers: flexibility for the energy transition, energy costs for Germany as an industrial location.
• Real responsibility and short decision-making processes in a team of around 15 people.
• AI-native environment that you don't have to implement internally, including budget for the tools you need.
• Urban Sports and an office centrally in Cologne.

What motivates us

• The energy transition has taken its first step. We are working on the second, crucial one.
• Cheap, renewable electricity is here, just at the wrong time. Our storage and optimization moves it where it's needed. This relieves pressure on networks, reduces prices and makes renewables easier to plan.
• At the same time, European industry pays the highest electricity prices in the world. These costs have long since determined whether a location can remain in Europe. We want to change that. We are fighting for a strong business location.

About the Company

How we work with AI

We are AI-first and mean it seriously: Coding agents, LLM-supported workflows and automation are everyday life for us, not experiments.

We're looking for speed with depth. An agent's output is only as good as the person checking it.

Additional Information

Send us your CV and write about what you have recently worked on and what drives you. Repo, project description or a few sentences are enough.