Python Developer

• Backend development: You will design and implement scalable APIs and microservices using FastAPI - from data integration to secure endpoints
• IoT data pipelines: Integration and processing of sensor data from LoRaWAN networks via MQTT and ChirpStack - you will ensure that no data point is lost
• Database architecture: Design and optimisation of TimescaleDB schemas for time-series data; high-performance queries for large data volumes are your speciality
• API security: Implementation of JWT-based authentication, refresh token strategies and modern authentication flows (including Redis session management)
• DevOps integration: Containerisation with Docker, helping to design CI/CD pipelines and deployment processes
• Quality assurance: Developing and maintaining a testing strategy using pytest, mypy and static code analysis tools (ruff, bandit) to ensure sustainable, secure code, * Modern tech stack: Python 3.12+, FastAPI, TimescaleDB, ChirpStack, Docker, GitLab CI - no legacy baggage
• Shaping the future: Your expertise matters - you have a real say in architectural decisions and the technical development of aduno®
• High-end equipment: Operating system of your choice - you decide what you work best with

Are you a Python developer with a passion for clean back-end systems, data-driven solutions and IoT infrastructure - and looking for a product that really makes a difference in the real world? With us, you'll integrate data streams from physical sensor networks with scalable back-end architectures and have a direct influence on our core product, aduno®., * Python proficiency: Several years' practical experience with Python 3.10+ and knowledge of object-oriented and functional programming

• FastAPI / REST: Extensive experience in the development and design of RESTful APIs using FastAPI or a comparable framework (Flask, Django REST)
• Databases: Proficiency in PostgreSQL or TimescaleDB; Understanding of time series data and query optimisation
• Messaging / IoT: Knowledge of MQTT protocols and experience with processing real-time data streams
• Docker: Proficiency in using containers for local development and deployment
• Testing mindset: Practical experience with pytest and writing unit and integration tests

Nice-to-haves

• Experience with ChirpStack or other LoRaWAN network servers
• Knowledge of Redis (session management, caching)
• Familiarity with modern authentication standards (JWT, OAuth 2.0, DPoP / RFC 9449)
• Understanding of clean architecture and scalable system designs
• Interest in network monitoring and carrier-grade infrastructures

Your personality

• Personal responsibility: You take ownership of your components and proactively drive projects forward
• Strong communication skills: You can clearly communicate technical matters - both within the team and to stakeholders
• Commitment to quality: Clean code, sustainable solutions and meaningful tests are second nature to you
• Pragmatism: You strike the right balance between perfection and time-to-market
• Team player: You enjoy sharing your knowledge, giving constructive feedback and working collaboratively to find the best solution
• Willingness to learn: You see IoT, network technologies and new Python patterns as exciting areas, not as obstacles

• Family-like corporate culture with flat hierarchies and short decision-making processes
• Attractive remuneration package based on your expertise and the added value you bring
• Flexible working hours and the option to work from home (hybrid)
• Work-life balance that deserves its name
• Training budget for conferences, training courses and certifications
• No dress code - come as you are
• Free drinks and regular team events
• Sport & leisure: Sportpark Hilden and HiFly Trampoline Park nearby
• Transport links: Direct bus stop and large staff car park
• JobTicket for local public transport
• Team spirit: A team that sticks together and supports each other

Do you want to build backend systems that really make a difference - and are you passionate about Python, clean architectures and IoT data? Then let's talk!