Freelance IoT Software Engineer (all genders)

About The Company GROPYUS is a technology-based construction company focused on building multi-story residential buildings. Thanks to its prefabricated building system with a wide range of design options, automated offsite construction, and fully digitalized processes, the company is able to create resilient timber housing quickly and cost-effectively. GROPYUS is using scalable construction and manufacturing solutions to tap into a future market, strengthen Europe’s innovation capacity, and play a substantial role in improving sustainability. The company delivers its multi-family houses as a complete and turnkey solution. The combination of technology, construction, robotics, and manufacturing expertise means buildings can be created in a fully digitalized end-to-end process. The building system is based on versatile wall and slab elements, making it easier to optimize land use, customize plans, and build fast with both off-site construction and on-site assembly. This system is complemented by the Building Operating System–developed in-house. About the role We are looking for a Senior Software Engineer freelancer to support GROPYUS on a 10-month project focused on our Smart Living and Smart Building technology stack. - Improve zero-touch provisioning [Kotlin, Spring Boot, Linux, BLE / Bluetooth Mesh] - Enhance monitoring capabilities [BLE / Bluetooth Mesh, Grafana, Prometheus, OTel Collector, Spring Boot] - Build a Proof of Concept for the new BOS Architecture based on the defined functional requirements The project is open to freelancers based anywhere in the EU, with an expected availability of 30–40 hours per week. What you will be doing - Build and configure Linux-based IoT and edge systems for smart homes and smart buildings - Develop device-to-cloud communication pipelines for telemetry, control, and automation - Work on edge computing components running on embedded Linux systems - Implement and support device lifecycle management: provisioning, configuration, monitoring, and OTA updates - Build internal tools and automation for IoT fleet operations and diagnostics - Ensure system reliability, security, and observability across edge and cloud layers - Collaborate closely with Product, Hardware, Platform, and Software teams About you - Strong experience with Linux-based systems in production environments - Knowledge of IoT connectivity technologies (BLE, LoRaWAN, WMBus) - Hands-on experience with IoT protocols such as MQTT, - Hands-on experience with embedded systems or edge computing - Solid understanding of distributed and event-driven architectures - Proficiency in Kotlin - Experience with containers, cloud platforms, and infrastructure components (e.g. PostgreSQL, Redis, message brokers, K8s clusters) - Experience with telemetry, streaming data, and time‑series data - A collaborative mindset and willingness to take ownership Nice to have - Experience with embedded Linux, OTA systems, or secure device identity - Knowledge of observability and monitoring across edge and cloud systems Join us on our mission to design buildings as continuously evolving products to create the most exciting and affordable experience for all. We build for people and conserve the resources of our planet. We can't wait to get to know you. For more information, visit our website.