Location: Remote Employment Type: Full-time About
Refinery89 Refinery89 is a Dutch AdTech company that helps
publishers optimize their programmatic performance through
advanced, data-driven technology. We build scalable systems that
process large volumes of advertising data to improve transparency,
efficiency, and monetization outcomes for digital publishers. Our
team operates internationally with a strong focus on engineering
quality and operational impact. Overview Refinery89 has been
steadily growing in the last years and recently the need for an
effective data management has become increasingly clear. To support
the development of the company’s data ecosystem, we are looking to
welcome a medior Data Engineer who will play a key role in shaping
and subsequently maintaining our data systems. Importantly, a
significant portion of our data environment is yet to be designed,
making this an excellent opportunity for professional growth. Key
Responsibilities Design, build, and maintain data pipelines
supporting Refinery89’s core data platform. Contribute to the




design and evolution of the company’s data architecture and
tooling. Implement reliable ingestion, transformation, and storage
processes for structured and semi-structured data. Ensure data
reliability, consistency, and basic data quality controls across
systems. Collaborate with engineers and internal stakeholders to
support analytics and operational use cases. Maintain clear,
consistent technical documentation for data systems and workflows.
Skills Hard requirements Experience in Linux management, bash
scripting Some exposure to cloud platforms (we use AWS, but
experience with any other cloud is acceptable) Python (medium
level) SQL (medium level) Writing clear and consistent
documentation Professional working proficiency in English Desirable
Common Python libraries, particularly boto3. Some others such as
psycopg2, pymysql, requests ETL/ELT processes Task orchestration
(cron jobs, AWS EventBridge, AWS Step Fu

📌 Junior Data Engineer (Madrid)
🏢 Refinery89
📍 Madrid