Senior Backend Engineer - Core Team (all genders)

• 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).

• Flexible working mode within 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 art technology and modern tech stack 
• Excellent hardware equipment (16 inch MacBooks, 2 screens at your workplace)  
• Support for your health through sports membership cooperations  
• Professional mental wellbeing support through our partner nilo for you and your family
• Flexible use of a monthly mobility budget (e.g. Jobrad, public transport) 
• Time and resources for individual growth 
• Regular tech & growth talks for internal knowledge sharing 
• envelio pension plan  
• Regular company and team events 

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.

• 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.

• 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.

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