Freelancer profile translated to English.
Back to original languageAbout Daniel
Java || Python || DevOps || Data Engineering
Flexible and broadly experienced Software Engineer with many years of experience working in the Java ecosystem.
Experienced in backend development in Python (FastAPI, SQLAlchemy), Data Science (Pandas, NumPy, matplotlib, scikit-learn, XGBoost, Jupyter), and Data Engineering.
Extensive DevOps experience with Linux, Containers (Docker, Kubernetes), CI/CD (GitLab, GitHub), Cloud (AWS, Hetzner), Monitoring & Observability (Prometheus, Grafana, OpenTelemetry).
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- energielenker solutions GmbHData preparation of energy data with Dagster, InfluxDB and GrafanaENERGY AND UTILITIESFebruary 2026 - June 2026 (4 months)Conception and implementation of an ETL pipeline in Python with Dagster for the transformation of raw energy data from heterogeneous sources using InfluxDB, as well as visualization with Grafana.
- Development of ETL pipeline in Dagster with dependency graph between assets
- Definition of time-controlled and dependency-based jobs
- Cloud-based deployment with Dagster+
- Connection of InfluxDB Cloud Serverless as data storage
- Preparation of data for use in Grafana, including cleaning and normalization of raw data, as well as temporal resampling
- Development of dashboards for visualization in Grafana
- Development of unit tests including mocking with pytest
- Setup of CI/CD pipeline in GitLab
- <Hausverwaltung>Conception and implementation of building infrastructure monitoringREAL ESTATENovember 2025 - January 2026 (2 months)Hamburg, GermanyConception and implementation of a concept for continuous monitoring of building infrastructure with Prometheus and Grafana, connecting data from heterogeneous sources (BACnet, MODBUS, SMTP, REST, ...).
- Deployment of Prometheus and Grafana in a local container environment
- Development of custom Prometheus exporters in Java with Quarkus
- Deployment of 3rd party Prometheus exporters
- Connection of exporters for data collection by Prometheus
- Creation of dashboards with transformations for visualization of data from network, IT infrastructure, and building automation systems
- Configuration of alarms and creation of policies with multi-channel notifications via Grafana and Prometheus Alertmanager
- Deployment of Mimir for long-term data storage with S3-compatible cloud backend
- Cloud-supported monitoring of local infrastructure using Cloudflare Workers
- Management of cloud resources using Terraform
- Statista Strategy GmbH & Co. KGFurther development, adaptation, and support of ETL pipelineDIGITAL AND ITNovember 2025 - May 2026 (6 months)Hamburg, GermanyFurther development of an ETL pipeline in Python with Dagster, conceived and implemented in a previous project:
- Adaptation of the pipeline to changed requirements, including adjustments to the output format
- Error analysis and resolution
- Ongoing operational support
- Consulting on design and expansion
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Education
- Dipl.-Ing.Technical University of Hamburg-Harburg2011Studium des Informatikingenieurwesens mit Spezialisierung auf Softwareentwicklung und Nachrichtentechnik