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 ensure clean, reliable data across the organisation.

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 database schema design and optimise query performance.
• Implement unit, integration and data‑quality tests to guarantee pipeline integrity.
• Deploy and iterate on pipelines using CI/CD practices and containerisation tools such as Docker.
• Participate actively in code reviews and contribute to a high‑quality codebase.

Required profile

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

Required skills

• Python
• ETL/ELT pipeline development
• SQL
• NoSQL
• Docker
• CI/CD workflows
• Unit and 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 an office offering stunning views of Barcelona.
• Paid day off on your birthday, weekly fresh fruit, coffee, tea and optional Friday happy hours.
• Team‑building events, health insurance, flexible compensation and a subsidised digital canteen.
• Annual training budget for continuous growth.