Senior Backend Developer (w/m/d)

• Driving Architecture: You design scalable and maintainable software architectures that ensure the long-term success of our platform and contribute your expertise to architectural decisions.
• Executing Complex Projects: You take on technical leadership for projects such as the development of a GenAI chatbot Salesforce synchronization or the overhaul of our RBAC system.
• Developing Services: You are responsible for developing new backend services and maintaining existing systems.
• Setting Standards: You implement automated tests conduct regular code reviews and ensure our software meets the highest quality standards.
• Strengthening Collaboration: You work closely with interdisciplinary teams translate requirements into technical solutions and support junior and mid-level developers through mentoring and technical guidance.
• Improving Scalability: You analyze existing systems identify optimization opportunities and develop solutions to continuously enhance the performance and scalability of our platform.

• Experience & Expertise: You have at least 5 years of experience in backend development have worked in agile environments (Scrum Kanban) and possess strong proficiency in Python and Go or a comparable programming language.
• Software Design & Maintainability: You apply established software design patterns to build maintainable systems that remain efficient and flexible over time.
• Project Execution: You have experience leading and delivering large-scale projects such as developing new services refactoring existing systems or integrating third-party solutions like Salesforce.
• Code Quality & Testing: You write clean maintainable code emphasize automated testing and ensure high team-wide quality through code reviews.
• Data & APIs: You have solid knowledge of SQL and REST APIs and you understand how to process data efficiently experience with Kubernetes and cloud technologies is a plus
• Teamwork: You enjoy working in a team provide mentorship to junior and mid-level developers and find pragmatic solutions to complex challenges.
• Work Eligibility: You must be a resident of Germany with a valid work permit.

• Make an Impact: Your work helps reduce CO emissions and makes buildings more sustainable and energy-efficient.
• Mobile Work: Work the way that suits you with flexible hours a short core working time and the freedom to work from our modern office in Cologne remotely across Germany or up to 10 days per year from within the EU.
• Long-Term Opportunity: After your probation period we offer a permanent employment contract.
• Feel-Good Perks: 30 vacation days fresh organic fruit regional coffee free drinks and a monthly team breakfast to keep you energized.
• Learning & Growth: Tailored training and development opportunities to support your career path.
• Tech Stack: Choose between Microsoft or Apple equipment plus high-quality noise-cancelling headphones for focused work.
• Mobility Package: Stay flexible choose between a Deutschlandticket or a JobRad for commuting or private use.
• Future Planning: We support your financial future with contributions to capital-forming benefits or company pension schemes.
• #teamaedifion: Regular team events flat hierarchies active knowledge sharing and a collaborative atmosphere define our team culture.
• Dog-Friendly Office: Your dog is welcome were happy to have furry team members!

Our goal is simple: we make buildings part of the solution for a planet worth living on. To achieve this we are looking for people who are passionate about innovation and technology who are up for any challenge and who share the same goal. Whether you are an experienced developer a natural sales talent or a newly qualified engineer you will be an important part of our mission from day one. Join #teamaedifion and help make the energy transition in buildings possible.