We are looking for a Senior Data Engineer SQL for one of our clients based in Luxembourg
* Freelance or permanent contract via payrolling company
* Strong expertise in advanced SQL development and enterprise data modelling (Data Vault, dimensional, 3NF)
* Fluent English is mandatory, German or French is a plus
Your responsibilities
SQL Development & Data Modelling
* You will design and optimize complex SQL transformations to support analytics, reporting, and regulatory requirements
* You will contribute to and enhance existing enterprise data models using structured methodologies
* You will ensure high-performance, maintainable SQL aligned with modelling standards
* You will implement robust data quality checks, validation rules, and SQL testing frameworks
* You will document data lineage, metadata, and architecture for transparency and governance
* You will help reduce architectural debt and maintain a consistent data ecosystem
Data Pipelines & Integration Engineering
* You will build and maintain SQL-centric ETL/ELT pipelines
* You will leverage Python to automate workflows and integrate APIs when needed
* You will implement batch, incremental, and near real-time ingestion patterns
* You will ensure strong monitoring, observability, and reliability of data pipelines
Business Intelligence Enablement
* You will structure SQL datasets optimized for BI consumption
* You will support data preparation, extraction logic, and backend performance
* You will assist BI teams with troubleshooting, prototyping, and governance topics
Cross Functional Collaboration
* You will collaborate with finance, risk, compliance, and business teams to translate requirements into data solutions
* You will align closely with data architects to ensure consistency in modelling approaches
* You will troubleshoot across data ingestion, modelling, and operational layers
* You will contribute to platform evolution and continuous engineering improvements
* You will communicate effectively with both technical and non-technical stakeholders
Data Platform & Operational Excellence
* You will work with infrastructure teams to ensure reliable production operations
* You will apply best engineering practices including version control, documentation, testing, and code quality
Profile
* You are highly proficient in SQL, including complex queries, tuning, and optimization
* You are experienced with enterprise data models such as Data Vault, dimensional models, SCD, or 3NF
* You are comfortable building scalable SQL-based transformations
* You are familiar with Python for automation and workflow enhancements
* You are experienced with BI tools such as Tableau or Power BI (considered an advantage)
* You are knowledgeable in financial services or regulated environments (a strong asset)
* You are committed to delivering reliable, maintainable, and well-tested data solutions
* You are quality-driven with a focus on monitoring, automation, and reliability
* You are proactive, solution-oriented, and engaged across the full data lifecycle
* You are able to refine requirements and collaborate effectively with diverse stakeholders
* You hold a Bachelor's or Master's degree in a relevant field
* You have at least 5 years of experience in data engineering or SQL-heavy backend roles
* You are familiar with banking or financial environments
* You may have exposure to core banking platforms such as Temenos (considered a plus)
Standort
Hays Luxembourg, Mettlach