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)