Senior Backend Engineer - Grid Connection Squad (all genders)

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 130 envelians are already on board. Dive in and thrive!


We're looking for a strong Senior Backend Engineer (all genders) who combines technical excellence with a passion for innovation. We're seeking someone with:

• A rock-solid foundation in software engineering—from design patterns to best practices.

• Deep technical expertise in Python, REST APIs, and SQL, with a focus on scalability, high quality, and security.

• Natural tech-lead qualities that inspire others with fresh ideas, top engineering standards, and a collaborative spirit by example.

Your Role
As a Senior Backend Engineer (all genders) in our Grid Connection Squad, you will be part of an interdisciplinary engineering team that designs and builds scalable API-driven backends, complex data handling logic, and efficient database transactions to develop high-performance, scalable cloud-based software. How You Make an Impact

• You design and optimize scalable APIs to handle complex business logic and serve precise asset data and geo-data responses efficiently.

• You understand data algorithms and complex logic workflows and simplify them for efficiency.

• You implement modern architecture and software design patterns to elevate the state of our code base to engineer lean, scalable SaaS products.

• You collaborate closely with Frontend and Full-Stack engineers to build efficient backend-frontend interfaces.

• You contribute to creating a sustainable, high-performant, and friendly team culture by example, connecting with your teammates to continuously refine and elevate our engineering standards and collaboration practices.

• You collaborate with cross-functional teams to integrate electrical engineering concepts into our products, improving functionality and user experience.

Your Profile
Perfection is a myth! We’re more interested in the human behind the screen, so think of these criteria as helpful directions — we're excited to see how your unique skills might fit in.

• You have 5+ years of experience developing modern API-based applications, ideally for SaaS products within startup-like working environments.

• You have senior-level expertise in Python, FastAPI, and PostgreSQL, with a track record of delivering efficient and maintainable solutions.

• You have a solid understanding of software engineering fundamentals and modern design patterns, which you leverage to build scalable, modular web-based products.

• You follow effective testing and QA methodologies to ensure quality and reliability, ideally using tools like Pytest or similar testing frameworks.

• You have proven experience leading technical decision-making in complex projects and can identify a balanced approach to trade-offs.

• You are a motivated team player with a strong desire for professional growth and a commitment to continuous improvement.

• You are business-fluent in English (Level C1).

• Optional big plus if you have experience in projects that combine software and electrical engineering and demonstrate an ability to integrate both domains.

• You are located in Germany, The Netherlands, or Spain.

How we develop Software

• Agile working method with Kanban in interdisciplinary squads

• Continuous integration / Continuous delivery

• Strong testing mentality and 4-eyes principle during code reviews.

• Constant Knowledge-Sharing practices between engineers.

• “You Code it – You Own it” – Squad responsibility for certain functional areas of the product

Our Tech Stack

• Python, FastAPI, Pytest and Celery.

• PostgreSQL

• RabbitMQ, Redis

• Docker, Kubernetes

Your Benefits

• 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)  

• State of the art technology and modern tech stack 

• Excellent hardware equipment (16 inch MacBooks, 2 screens at your workplace) 

• 30 holidays + 3 corporate holidays  

• Support for your health through sports membership cooperations  

• Flexible use of a monthly mobility budget (e.g. Jobrad, public transport) 

• Time and resources for individual growth  

• envelio pension plan  

• Regular company and team events