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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # (Senior) Software Engineer Data Integration (all genders) - **Company:** envelio GmbH - **Location:** Köln, Germany (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Agile Methodology, Unit Testing, Code Review, Databases, Continuous Delivery, Continuous Integration, Information Engineering, Data Integration, Extract Transform Load (ETL), Python (Programming Language), PostgreSQL, Message Queuing Telemetry Transport (MQTT), Redis, Software Engineering, SQL Databases, Systems Integration, Data Ingestion, Backend, Fastapi, Event Driven Architecture, Pytest, Kubernetes, Information Technology, Apache Kafka, Celery, Restful APIs, Stream Processing, Grpc, Data Pipelines, Docker, Web Api - **Published:** May 29, 2026 - **Apply:** https://de.indeed.com/viewjob?jk=e50eb3ad4a4baa0e ## About the Role Do you have experience in gRPC?, * You have 2+ years of relevant experience in backend development with a focus on data engineering, API integration, or event-driven systems. * You have a degree in Computer Science, Data Science, Software Engineering, Electrical Engineering, Industrial Engineering, or a comparable field of study. * You have practical experience in Python programming and are familiar with common best practices. * You have experience with SQL databases, preferably PostgreSQL or TimescaleDB, in the area of data modelling and query design. * You have experience integrating with external APIs or streaming systems (e.g. Kafka, MQTT, REST or gRPC). * Ideally, you are familiar with IoT or energy domain protocols (e.g. MQTT, IEC104) and have worked with real-time data pipelines. * You are a team player and passionate about working with talented and inspiring people. * You are looking for technical challenges and pride yourself in finding smart and simple solutions for complex problems. * You are familiar with parts of our tech stack and are looking forward to keeping up with current industry best practices. * You are business-fluent in English (Level C1)., * Agile working method with Kanban in interdisciplinary squads. * Continuous Integration / Continuous Delivery. * Unit Test mentality and 4-eyes principle during code reviews. * Knowledge sharing sessions between developers. * "You Code It - You Own It" - Squad responsibility for certain functional areas of the product. ## Description * You build new measurement integrations end-to-end: connecting external IoT devices (via Kafka, MQTT, IEC104, REST, gRPC) through device registration and normalization to live data ingestion, transformation, and storage. * You design and improve the measurement integration framework to make adding new sources faster, more reliable, and more observable. * You own the full integration lifecycle - from raw external data to normalized, mapped measurements, including custom transformations and ID mappings. * You contribute to the existing ETL framework for importing and digitizing customer grid data from heterogeneous source formats. * You optimize existing components for performance, reliability, and transparency across batch and streaming workloads. * You have a continuous improvement mindset and actively look for ways to bring our code to industry best practices with confidence., * Python, incl. additional packages/frameworks e.g., FastAPI, Pytest, PyArrow, Celery * Go * Databases: Redis, PostgreSQL, TimescaleDB, DuckDB * Protocols: Kafka, MQTT, IEC104, gRPC * Infra: Docker, Kubernetes Your Benefits * Join us fully remote #LI-Remote or at our lovely office in Cologne in a hybrid working mode * Option for remote work from abroad (up to three months per year from anywhere in the EU or the USA) * State of the art technology and modern tech stack * Excellent hardware equipment (16-inch MacBooks, 2 screens at the office) * 30 holidays + 3 corporate holidays * Support for your health through Urban Sports Club cooperation * Flexible use of a monthly mobility budget (e.g. Jobrad, public transport) * Time and resources for individual growth * envelio pension plan * Regular company and team events ## Related Videos - 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