Freelancer profile translated to English.

Description

I build modern data stacks that turn distributed Excel/CSV/API sources into reliable data products – including tests, monitoring, and clean deployments, so teams don't have to work in a firefighting mode.

Typical projects:

• dbt modeling (Star Schema, tests, lineage) & SQL performance

• Orchestration and robust ELT/ETL pipelines with Dagster (SLA, retries, alerting)

• Warehousing on Snowflake/BigQuery including governance and PII-secure ingest

Optional: lean API (FastAPI) or internal dashboard (Streamlit) to make data products quickly usable.

Stack: Python, SQL, dbt, Dagster, Snowflake/BigQuery, GitHub Actions, Kubernetes, Grafana.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Vilisto
Machine Learning Engineer
ENERGY AND UTILITIES
January 2025 - Today (1 year and 5 months)
Hamburg, Germany
Built a reproducible ML evaluation/data pipeline for battery capacity & runtime forecasts, including unified telemetry, versioned datasets, and experiment tracking (Dagster, MLflow, Python).
Data platform hardening for analytics/ML: PII-secure ingest, dbt models/tests/lineage, scheduled runs, staggered rollouts (dbt, Dagster, ArgoCD).
Observability for the IoT fleet: Dashboards/alerts for offline/anomalies & data quality issues, enabling faster incident detection (Grafana).
Operation/deployment of data/ML services on Kubernetes (Helm, logging/metrics) and internal tooling (FastAPI + Dashboard) for lab monitoring.
Kubernetes Python Machine learning Data Engineer Data visualisation
Saracus Germany,
Big Data Consultant
CONSULTING AND AUDITS
January 2023 - December 2024 (1 year and 11 months)
Münster, NW, Germany
Design and implementation of scalable cloud data warehouses (Snowflake on AWS, BigQuery, Azure Synapse) including automated Python ETL pipelines and reporting setups.
Development of several Streamlit apps with OAuth/SSO and Snowflake integration, deployed in Azure (Container Apps/Storage).
Data Governance/MDM implementation (Ataccama + Azure) including automation of glossary/metadata via Azure Functions + Python.
AWS Microsoft Azure Google cloud Snowflake SQL
Vilisto
Data Scientist
ENERGY AND UTILITIES
September 2021 - October 2022 (1 year and 1 month)
Hamburg, Germany
Machine learning models: Expanded and maintained presence detection and energy optimization models with Python and scikit-learn, improving accuracy and enabling automated heating control for thousands of IoT thermostats.
Data Engineering & Analytics: Developed and optimized database schemas and pipelines in PostgreSQL/TimescaleDB; performed in-depth analyses with SQL, pandas, and matplotlib to improve device performance and data quality.
Software Development: Contributed to backend (Python, REST APIs, Docker) and frontend systems (TypeScript, Vue.js) for data visualization and operational tools.
Independent Projects: Designed and implemented a PyQt labeling tool for detecting time events and led internal programming workshops.
Machine learning Deep Learning LLM JavaScript Python

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Bachelor Computer Science
TU Dortmund
2023
Bachelor Computer Science
Master Computer Science Focus AI /
University of Muenster
2026
Master Computer Science Focus AI /

Jonathan Wrede

Data & ML Platform Engineer

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