Senior Backend Engineer (IoT) (all genders)

About tonies: tonies is the world’s leading interactive audio platform for children, with over 12 million Tonieboxes and 165 million Tonies sold globally. Our intuitive, screen-free system empowers children to learn and play independently in a safe and engaging way. With a presence in over 100 countries and a diverse portfolio of ~1,500 Tonies across multiple languages, we continue to redefine how children experience storytelling and learning. Since our IPO in 2021, our global team of 630+ colleagues is united by a shared mission: shaping the future of play, learning, and imagination. You as part of tonies: Do you want to develop a product that is used worldwide? Do you have high standards for continuous discovery, usability and clean code? Do you challenge decisions and ideas against current requirements to ensure continuous improvement? If you answered “YES!” to these questions, we want to talk to you! As a Senior Backend Engineer (m/f/d) you will join a talented product team dedicated to developing and maintaining the Toniecloud IoT services. Your focus will be on continuous discovery, usability, quality and security, ensuring a top-tier experience for our millions of users worldwide. In the IoT and Control stream, you will play a central role in ensuring the seamless integration of our IoT products. You will empower our users by providing them with intuitive tools to set up and customize their devices to suit their unique needs. Your tasks and responsibilities will include: You take charge of developing and maintaining our Toniecloud IoT services, ensuring they meet the needs of millions of users Play a key role in our Toniecloud ecosystem, which includes: A robust django backend platform offering RESTful and GraphQL APIs An IoT messaging stack that processes technical diagnostic data from millions of Tonieboxes around the globe Maintain our commitment to reliability, ensuring our services are available 24/7, 365 days a year, and helping us achieve our 99,99% SLA Collaborate within a cross-functional, stream-aligned team, where you’ll champion technical excellence to deliver seamless, always-on services. You’ll also work closely with the Product Manager and team members to ensure a fantastic user experience within the app (enabling parents to set up and configure their Tonieboxes and Tonies, enabling unlimited joy for our little listeners) What we are looking for: You have been a passionate software engineer for many years and are excited to continue improving your skills Track record in building or maintaining backends for IoT products You are fluent in at least two programming languages, one of them is Python – and you can quickly adapt to new languages when needed Experience with Django is essential Your code is lean, well-structured and easy to understand. You avoid unnecessary complexity from the outset and have a knack for solving complex problems with simple solutions You are familiar with database systems (ideally PostgreSQL) and use ORMs thoughtfully and efficiently Linux is your preferred environment and working with Git and GitLab is part of your daily routine Your work style is characterized by agility, teamwork, independence and creativity, especially when exploring new solutions You place great importance on automated tests, CI/CD, and observability APIs (REST or GraphQL) are like your native language You are comfortable communicating in English in a professional work environment You must be currently based in Germany. Last but not least: you are enthusiastic about our product and want to join us on our exciting journey! Why tonies? Global Teamwork: We collaborate across departmental and country borders on our vision to bring the Toniebox into every child's room in the world. Come as you are:  This applies not only to the dress code but also to everything else. Because only where you truly feel comfortable can you give your best. Mobility : Choose the option that s