Freelance IoT Software Engineer (all genders)

Freelance IoT Software Engineer (all genders)Berlin, Berlin, GermanyAbout The CompanyGROPYUS is a technology-based construction company focused on building multi-story residential buildings. Thanks to its prefabricated building system with various design options, industrial offsite construction, and fully digitalized processes, the company manufactures aspirational, sustainable, and affordable homes using timber construction methods. GROPYUS is using scalable construction and manufacturing solutions to tap into a future market, boost Europe's strength in innovation, while also playing a substantial role in improving sustainability.About the roleWe 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 requirementsThe project is open to freelancers based anywhere in the EU, with an expected availability of 30–40 hours per week.What you will be doingBuild and configure Linux-based IoT and edge systems for smart homes and smart buildingsDevelop device-to-cloud communication pipelines for telemetry, control, and automationWork on edge computing components running on embedded Linux systemsImplement and support device lifecycle management: provisioning, configuration, monitoring, and OTA updatesBuild internal tools and automation for IoT fleet operations and diagnosticsEnsure system reliability, security, and observability across edge and cloud layersCollaborate closely with Product, Hardware, Platform, and Software teamsAbout youStrong experience with Linux-based systems in production environmentsKnowledge of IoT connectivity technologies (BLE, LoRaWAN, WMBus)Hands-on experience with IoT protocols such as MQTTHands-on experience with embedded systems or edge computingSolid understanding of distributed and event-driven architecturesProficiency in KotlinExperience with containers, cloud platforms, and infrastructure components (e.g. PostgreSQL, Redis, message brokers, K8s clusters)Experience with telemetry, streaming data, and time ? series dataA collaborative mindset and willingness to take ownershipNice to haveExperience with embedded Linux, OTA systems, or secure device identityKnowledge of observability and monitoring across edge and cloud systemsJoin 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.