(Senior) Backend Engineer - Core Team (all genders)

envelio; Köln; On-site; EUR 75,000 - 110,000; Full time

Benefits offered by this job

Hybrid work model

Remote work up to 3 months/year

Modern tech stack

High-end hardware

Health & wellbeing support

Mobility budget

Growth talks

Pension plan

Team events

Job summary

envelio is seeking a (Senior) Backend Engineer to join the Core Team and drive the GridHub component that feeds all applications. You will shape the Digital Twin interfaces, design cross‑application workflows, and enhance data modelling and grid calculations within an agile squad.

Join a remote‑first, diverse team with modern tech, Python stack, and strong focus on scalable infrastructure. Cologne office available; EU remote options supported.

Qualifications

• 3+ years of backend web application development experience.
• Experience with relational databases and data modelling, preferably digital twins.
• Strong Python experience, with Celery for task orchestration.
• Experience with graph data or graph databases.

Responsibilities

• Influence the shape of the Digital Twin by designing interfaces.
• Develop cross-application workflows ensuring data integrity.
• Improve modelling and calculation of electrical grids.
• Contribute to system architecture in code, data model and infra.
• Collaborate with other developers to ensure smooth interaction.

Skills

Backend development

Data modelling

Infrastructure design

Python

PostgreSQL

Celery

Graph data

Team player

English (C1)

Tools

Docker

Kubernetes

RabbitMQ

Redis

FastAPI

Job description

About Working At Envelio

Too easy is boring! Together, we are on a mission to drive forward the energy transition. We love what we do, and we are unafraid to dive in. We believe in taking ownership of our work and in continuously growing and evolving. In short: own it, love it, grow with it.

About Working At Envelio

Too easy is boring! Together, we are on a mission to drive forward the energy transition. We love what we do, and we are unafraid to dive in. We believe in taking ownership of our work and in continuously growing and evolving. In short: own it, love it, grow with it.

We are a humble team of coffee and maté lovers with over 20 nationalities. With our geek humor, our love for emojis and random facts is only natural. Over 150 envelians are already on board. Dive in and thrive!

Your Role

As(Senior) Backend Engineer - Core Team (all genders)you will be part of an engineering squad with strong knowledge in software architecture, data modelling and graph-functionality. Together, you drive the development of the GridHub - our Core Component which feeds all applications - and directly influence the experience of our users, our organization, and our engineering practices.

How You Make An Impact

• As part of the Core team, you directly influence the shape and functionality of our Digital Twin, by designing interfaces and generalized functionality for complex requirements.
• You develop and extend cross-application workflows that ensure data integrity for planning and live applications. In doing so, you always strive to capture the app‑specific requirements in a universally applicable solution.
• You familiarize yourself with our individual and domain‑specific solutions within the modelling and calculation of electrical grids and improve them in an independent and innovative way.
• You are actively involved in the design and improvement of our system architecture in the area of code, data model and infrastructure.
• You exchange ideas with other developers to enable a smooth interaction between the different components.

Your Profile

• You have +3 years of relevant experience in web application development with a focus on backend components, data modelling and infrastructure.
• You have experience with relational databases in the architecture of Data Models, preferably Digital Twins, and the design of queries, preferably in PostgreSQL.
• You have extensive experience with Python, ideally related to orchestration and parallelization of tasks in the context of multi‑processing, e.g. with Celery.
• You have experience with graph‑data, e.g. through experience with graph databases or other graph tooling such as networkX.
• You are a team player and passionate about working with talented and inspiring people.
• You prefer complex, technical challenges and have high standards for your elaborate and intelligent solutions.
• You are familiar with parts of our tech stack and are looking forward to keeping up with current industry best practices.
• Optionally, you are familiar with one or more of these topics: distributed computing, graph theory and geoinformatics.
• You are business‑fluent in English (Level C1).

How We Develop Software

• Agile working method with Kanban in interdisciplinary squads.
• Continuous Integration / Continuous Delivery.
• Unit Test mentality and 4‑eyes principle during code reviews.
• Knowledge sharing sessions between developers.
• “You Code It – You Own It” – Squad responsibility for certain functional areas of the product.

Our Tech Stack

• Python, incl. additional packages/frameworks e.g., FastAPI, Pytest and Celery.
• PostgreSQL.
• RabbitMQ, Redis.
• Docker, Kubernetes.

Your Benefits

• Flexible working modewithin Germany: Hybrid, from home or in our lovely office in Cologne
• Option for remote work from abroad(up to three months per year from anywhere in the EU or the USA)
• State of the arttechnologyandmodern tech stack
• Excellenthardware equipment(16 inch MacBooks, 2 screens at your workplace)
• Support for your health throughsports membership cooperations
• Professional mental wellbeing support through our partner nilo for you and your family
• Flexible use of a monthlymobility budget (e.g. Jobrad, public transport)
• Time and resourcesfor individual growth
• Regular tech & growth talks for internal knowledge sharing
• envelio pension plan
• Regular company and teamevents

About Us

Intelligent grids for a sustainable future worldwide — this is our vision! Therefore, we are building the digital hub for the future of power grid management: The Intelligent Grid Platform (IGP). The IGP is the core of our software as a service solution. It’s our ambition to make the IGP and envelio 1 % better everyday. Grow with us! As a remote‑first company, we let you decide how much you want to work remotely – from 0% to 100%. Whether you live in Cologne or Aachen, Bonn or Berlin, Munich or Castrop‑Rauxel; all you need is internet! You can also work from abroad for up to three months per year. Since 2017, we have built a diverse international team, with English as our company language.