Mid-Level Backend Engineer – Data Pipelines

About the role

We are seeking a motivated Mid‑Level Backend Engineer to join a fast‑growing startup in Barcelona. You will design, build, and optimise data pipelines and backend services that keep the organisation’s data clean, reliable and readily available.

Key responsibilities

• Design, develop and maintain scalable ETL/ELT pipelines for ingesting, transforming and loading data from multiple sources.
• Write clean, efficient Python code with a focus on performance, memory usage and maintainability.
• Collaborate on SQL and NoSQL schema design and optimise query performance.
• Implement unit, integration and data‑quality tests to ensure pipeline integrity.
• Deploy and iterate on pipelines using CI/CD practices and Docker containers.
• Participate actively in code reviews and contribute to a culture of continuous improvement.

Required profile

• Strong Python engineering skills with production‑grade code quality.
• Experience building and operating ETL/ELT pipelines and large‑scale data ingestion.
• Familiarity with both SQL and NoSQL databases, including schema design and query optimisation.
• Ability to work autonomously from requirement definition to production deployment.
• Professional proficiency in English and Spanish.

Required skills

• Python
• ETL / ELT pipelines
• SQL
• NoSQL
• Docker
• CI/CD workflows
• Unit testing
• Integration testing

What we offer

• Full‑time permanent contract with a salary of €35,000–€50,000 gross per year.
• Hybrid work model with flexible hours and stunning office views.
• Paid birthday day off, weekly fresh fruit, coffee, tea and optional happy hours.
• Health insurance, flexible compensation and subsidised digital canteen.
• Annual training budget for continuous growth.