Freelance Data Consultant Engineer

adesso Belgium is the Belgian entity of the adesso group, a fast‑growing IT provider with a proven track record across different industries. With more than 10,000 employees across 60 locations, adesso is expanding its presence in Europe – and Belgium is a key part of that strategy.

From our base in Brussels – the capital of Europe – we are building a Data & AI practice that combines the agility of a start‑up with the backing of a solid international group.

We are looking for experienced freelance Data Engineers to join our talent pool for upcoming projects with our customers in Belgium.

As a Freelance Data Engineer working with adesso Belgium, you help our clients design, build and operate data solutions that enable better, data‑driven decisions.

Depending on the assignment and your expertise, you may be involved in:

• Design, build and maintain data ingestion and transformation pipelines from various sources (files, APIs, databases, SaaS systems, …).

• Implement robust ETL/ELT processes using modern data engineering tools and frameworks.

• Ensure data is delivered in a reliable, performant and secure way.

• Design and implement data models for analytics and reporting (e.g. data warehouses, data marts, curated datasets).

• Prepare and expose data to BI and analytics tools and to data science / ML use cases.

• Apply good practices for documentation, naming conventions and reusability.

• Work with modern data platforms and environments, on‑premise or in the cloud, depending on the client context.

• Contribute to the design and implementation of the different layers of a data platform (ingestion, storage, processing, serving).

• Help ensure that solutions are scalable, maintainable and aligned with the client’s architecture and standards.

• Implement data quality checks, monitoring and logging to ensure trustworthy data.

• Troubleshoot and optimize pipelines and queries for performance and cost‑efficiency.

• Use version control and automation practices to industrialize and secure deployments.

• Work closely with data architects, BI developers, analysts, data scientists and business stakeholders to understand requirements and translate them into technical solutions.

• Communicate clearly on progress, risks and technical decisions, and contribute to a constructive team dynamic.

You don’t have to tick every box, but you recognize yourself in most of the following:

• At least 3–5 years of experience as a Data Engineer or in a similar role, ideally in a consulting / project‑based environment.

• Strong skills in SQL and a good understanding of data modeling for analytics (data warehouse concepts, dimensional modeling / star schema, …).

• Experience building data pipelines and data solutions with one or more modern tools / technologies (e.g. scripting or programming languages, integration tools, databases, BI or analytics platforms).

• Good programming skills in Python (or another language commonly used for data engineering).

• Familiarity with version control (Git or similar) and basic automation / CI/CD practices.

• Comfortable working directly with business and IT stakeholders, with good communication skills.

• Used to working as a freelancer: autonomous, professional, able to integrate quickly into new teams and environments.

• Fluent in French or Dutch, and comfortable in English (spoken and written).

• Experience in industries such as banking, insurance, energy, e‑commerce, public sector.

• Exposure to modern concepts such as data platforms, data lakes, Lakehouse, data mesh, data products.

• Experience with tenders, RFPs or long‑term managed services is a plus.