Backend Engineer

As a Mid-Level Backend Engineer on our Tech Team, you will design, build, and optimize the 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 🛠️

Here's what you can expect to work on:

• 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, integration tests, and data quality checks to guarantee pipeline integrity and catch issues before they reach production.

• Deploy and iterate on pipelines using CI/CD practices and containerization tools such as Docker, participating actively in code reviews to uphold team standards.

What we'd love to see 😍

Strong Python engineering skills with a focus on performance, memory efficiency, and writing maintainable, production-grade code.

• Solid experience building and operating data pipelines — ETL/ELT patterns, pipeline orchestration, and handling large-scale data ingestion.

• Familiarity with both SQL and NoSQL databases, including schema design and query optimization.

• Comfort working autonomously — able to take a high-level requirement, define scope, and drive it to production without heavy hand-holding.

• Ability to navigate unfamiliar codebases quickly and contribute meaningfully from an early stage.

• Experience with CI/CD workflows and containerization (Docker or similar).

Language Proficiency: Professional proficiency in both English and Spanish to collaborate effectively in our bilingual environment 🗣️.

If this sounds like you, don't worry if you don't check every single box—we'll support your growth along the way. 🚀🙌

What we offer 🎁

• A full-time, permanent contract. 📃

• A salary range of €35,000 – €50,000 gross per year, based on experience. 💰

• A cool office between Sants Estació and Plaça Espanya with stunning views of Barcelona. 🏙️✨

• Flexible working hours and hybrid work options. ⏰

• Paid day off on your birthday. 🎂🎉

• Weekly fresh fruit, coffee, and tea on tap. 🍎🍵

• Friday happy hours after our all-hands meetings (totally optional, of course!). 🍻🥳

• Team-building events to bond and have fun. 🎈🤝

• Health insurance and flexible compensation with Alan. 🏥💸

• A digital canteen, thanks to Kombo, subsidised at 50%. 🍽️😋

• A yearly training budget to keep growing. 📚📈