Fullstack Developer with Backend Focus (m/f/d)
KIWI
Software Engineering
Berlin, Germany
Posted on Mar 28, 2026
Fullstack Developer with Backend Focus (m/f/d)
Berlin
Full-time
Temporary
Your Team
Our engineering team is a mix of cross-functional engineers, covering the full range from systems, mobile, web/front-end and back-end through hardware and firmware development. Our highest priority is to safeguard the privacy and security of our users while maintaining reliability of our service. Should you have experience in Digital Access, PropTech, IoT, or FinTech you most likely already laid the foundation for navigating through your workday and tasks at KIWI.
We are now looking for a Senior Fullstack Engineer (m/f/d) starting asap for 40 hours / week with a few years of experience in backend development using Python and web frontend development with React. You’ll join us at a inflection point where we are evolving our business and our software architecture for large scale operations. You will be responsible for the design and development of our core product, from the web portal to backend systems. You will also help evolve the overall architecture of the application and continuously work to ensure maximum performance, usability and stability.
Your role
Backend development in Python on KIWI's own digital access control system
Web frontend development in React
Contribute to KIWI's overall software architecture and design
Close cooperation with KIWI product management in defining requirements and turning user’s needs into a working product
Optimization of the application for maximum speed and scalability
Coordination with and support of adjacent engineering disciplines, namely embedded development, mobile app development, and DevOps
Support and code reviews for your fellow software development teammate
Occasional support of our customer success team
Your skills
Relevant professional experience of at least 4 years
English proficiency at least at B2 level, German is desirable
Residence in Germany already exists
Understanding of fundamental design principles and software architectural concepts behind scalable, reliable, and offline-capable software systems and applications
Proficient in Python as our back-end programming language
Solid knowledge of React for frontend development
Experienced in using git
Good understanding of PostgreSQL
Familiarity with container-based systems (Docker, Kubernetes)
Interest in and understanding of design principles that enable automated testing/unit test
Interest in embedded systems, smart building, Internet of Things (IoT)
Our offer
A very positive company culture characterized by team spirit, fun, support and passion
A high level of autonomy and strong team support
Tackle challenging and diverse issues
Home-office and a stylish office in the heart of Berlin
Flexible working hours and the possibility of "workations" for a better work-life balance
The opportunity to quickly take on responsibility and actively implement your ideas
Laptop and mobile phone provided
28 working days of vacation, plus Christmas Eve and New Year's Eve as a gift from us
Annual training budget
Dog-friendly office
Be Yourself
"We choose to be inclusive and love our diverse natures, whether it's our origin, gender, sexual identity or our belief. Uniqueness is powerful."
In line with our values, incoming applications are evaluated solely based on professional qualifications, without regard to ethnic and social origin, religion or worldview, gender, sexual orientation, disability, or age.
In line with our values, incoming applications are evaluated solely based on professional qualifications, without regard to ethnic and social origin, religion or worldview, gender, sexual orientation, disability, or age.
About us
Our goal is to replace the physical key and to revolutionize key management. Our smart access-as-a-service solution KIWI allows users to unlock doors completely hands-free with our identity token KIWI Ki or by using our KIWI App. Our customers from the real estate industry use the KIWI Portal to simplify key management. And service providers like Deutsche Post and waste management companies open the doors of apartment buildings with KIWI.
