Backend Engineer (Fintech / Barcelona)

About The Role

As a Mid‑Level Backend Engineer on our Tech Team, you will design, build, and optimize data pipelines and backend services that keep clean, reliable data flowing across the entire organization. You will own the full lifecycle of data ingestion and transformation work—from understanding a business requirement through to production deployment—and directly shape the backend infrastructure that powers our data‑driven decision‑making at Flanks.

What You’ll Do

• Design, develop, and maintain scalable ETL/ELT pipelines to ingest, transform, and load data from multiple disparate sources into our core systems.
• Write clean, efficient Python code with a strong focus on performance, applying optimal data structures and algorithms to handle high‑volume datasets reliably.
• Collaborate on database schema design (SQL and NoSQL) and own query performance optimization to ensure fast, accurate data access.
• Implement unit tests, in...