3 months ago
Berlin, Germany +2 moreMid Level / Senior
Responsibilities
- Develop and maintain data models across raw and curated data layers.
- Build and optimize ETL/ELT pipelines ingesting billing, CRM, network, product, and support data into an S3-based data lake.
- Consume Kafka topics and handle late, duplicate, and out-of-order events.
- Create dbt transformations with tests and documentation.
- Orchestrate and monitor Airflow pipelines, including retries, alerting, backfills, and SLAs.
- Write efficient SQL for transformation logic and ad-hoc investigations.
- Implement data quality checks for completeness, freshness, and reconciliation against source systems.
- Maintain accurate technical documentation and contribute to development processes and continuous improvement.
- Own the quality and end-to-end outcomes of data flows.
Requirements
- 3–5 years of hands-on data engineering experience.
- Strong SQL skills, including window functions, common table expressions, and query optimization.
- Experience building and maintaining data pipelines with AWS S3, Glue, and Athena, or comparable lake and warehouse technologies.
- Practical understanding of data modeling, raw-to-conformed layers, and dimensional modeling.
- Experience consuming Kafka or another streaming or messaging system as a data source.
- Advanced Python proficiency for ETL development, data manipulation, and system automation.
- Strong communication skills.
- Preferred experience with Airflow DAG design, retries, and backfills.
- Preferred experience with dbt modeling, testing, and documentation.
- Exposure to Apache Iceberg or other open table formats is preferred.
- Telecommunications or other high-volume regulated data experience is preferred.
Benefits
- On-site, full-time role in Lisbon, Portugal.
- Opportunities for career growth in a rapidly expanding telecommunications company.
- Exposure to major transactions affecting the telecommunications industry.
- Professional development alongside industry experts.
- Opportunities to work in different 1GLOBAL offices internationally.
- Collaborative, dynamic, fast-paced, and open communication environment.
Tech Stack
Amazon RedshiftApache AirflowApache HiveApache KafkaApache SparkAWSdbtGoogle BigQueryPythonSnowflakeSQL
Categories
Data Engineering
About 1GLOBAL
1GLOBAL provides eSIM-based mobile connectivity and an owned global core network for enterprises, consumers, and IoT device makers, sold via subscriptions and wholesale/MVNO services. The privately held company operates as a regulated telecom provider across 40 countries, including MVNO operations in 12 markets, and offers APIs to embed mobile service into brands and apps. Founded in 2022 by Hakan Koç and Pyrros Koussios, it is headquartered in Amsterdam.