Data engineer SQL M/F

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, Merzig