Senior Fullstack Developer (w/m/d)

About us
At aedifion, you will actively shape the future of energy-efficient building operations. Our mission is to make existing buildings smarter, more sustainable, and easier to manage – making a real contribution to CO₂ reduction.
You’ll join an innovative tech company that uses cutting-edge technologies like IoT, AI, and cloud solutions to enable sustainable real estate. Our culture? Open, diverse, and team-oriented. With nearly 90 colleagues from 12 different nations, we combine a wide range of expertise and perspectives to achieve big things together. Your impact in this position:
As a Senior Fullstack Developer (f/m/d), you are the driving force behind the development of our scalable and maintainable software solutions. You work at the intersection of backend and frontend, ensuring that our platform runs seamlessly — from processing large volumes of data to delivering an intuitive user experience.
You take end-to-end responsibility for products and services and contribute your expertise to the design of sustainable architectures. You improve the scalability and performance of existing systems and build new services with high code quality. Through your work, you promote agile methodologies and support mid-level and junior developers in their growth. Your contribution is key to making our vision of autonomous, energy-efficient buildings a reality. What you can expect:

• Fullstack Development: Design, development, and maintenance of backend services (Python, Go) and frontend components (VueJS and TypeScript) to ensure a seamless user experience.
• Architecture: Co-design of a scalable and robust software and system architecture with a focus on long-term sustainability.
• Code Quality: Ensuring high-quality software through automated testing, code reviews, and the application of best practices.
• Teamwork: Close collaboration with cross-functional teams to clarify technical requirements and develop efficient solutions.
• Mentoring: Supporting and mentoring junior and mid-level developers through coaching and technical feedback.
• Innovation: Continuous improvement of our platform by using modern technologies and promoting agile ways of working.

What you bring along:

• Experience: At least 5 years of professional experience in backend development, ideally with fullstack expertise and a background in agile development environments.
• Fullstack Development: Development and maintenance of backend services and frontend components to ensure a seamless and scalable user experience.
• Architecture: Active contribution to the design of a sustainable software and system architecture that ensures long-term scalability, stability, and efficiency.
• Tech Stack: Solid experience with Python and Go, familiarity with SQL, REST APIs, and Kubernetes; optionally, knowledge of frontend technologies such as VueJS and TypeScript.
• Work Style: A structured approach to complex challenges, high quality standards, and a strong sense of ownership for services and projects.
• Soft Skills: Strong problem-solving skills, ability to prioritize effectively, enthusiasm for working in cross-functional teams, mentoring capabilities, and clear technical communication.

Benefits

• Make an Impact: Your work helps reduce CO₂ emissions and make buildings more sustainable and energy-efficient.
• Mobile Work: Shape your workday to fit your lifestyle – with flexible working hours, a short core working time, and the freedom to work from our modern office in Cologne, remotely from anywhere in Germany, or up to 10 days per year from other European countries.
• Long-Term Perspective: After your probation period, we offer you a permanent employment contract.
• Feel-Good Perks: Enjoy 30 days of annual vacation to recharge, plus fresh organic fruit, regional coffee, free drinks, and a monthly team breakfast to power your day.
• Professional Development: We support your growth with tailored training and development opportunities to advance your career.
• Tech Stack: You’ll receive modern equipment of your choice – Microsoft or Apple – and high-quality noise-cancelling headphones for focused work.
• Mobility Package: Stay mobile with your choice of the Deutschland-Ticket or a JobRad – for commuting or personal use.
• Retirement & Savings: We contribute to capital-forming benefits (VWL) or your company pension plan (bAV).
• #teamaedifion: Regular team events, collaboration at eye level, active knowledge sharing, and flat hierarchies foster a strong team spirit and open communication.
• Dog-Friendly Office: Bring your dog along – we’re happy to welcome four-legged team members too!