Backend Software Engineer at Flanks

Department: Tech

Language

Compensation

€35,000 – €50,000/yr

Setup: Hybrid
Location: Barcelona, Catalonia
Type: Full-time
Level: mid
Posted: Jun 4, 2026

Description

Flanks is hiring a Mid-Level Backend Engineer to design, build, and optimize data pipelines and backend services for its wealth-management SaaS platform. The role owns the full lifecycle of data ingestion and transformation, including Python or JavaScript development, SQL and NoSQL schema design, query optimization, testing, CI/CD, and containerization with Docker. It is a full-time permanent position based in Barcelona with a salary of €35,000–€50,000 gross per year and hybrid work options.

Required Skills

Python
JavaScript
ETL/ELT
Data pipelines
SQL
NoSQL
CI/CD
Docker
Query optimization

Additional Information

Required Previous Experiences: Experience building and operating data pipelines, including ETL/ELT patterns, orchestration, and large-scale data ingestion
Experience building backend services for a product, ideally with Elasticsearch
Experience with CI/CD workflows and containerization using Docker or similar
Preferred Qualifications: Strong Python or JavaScript engineering skills focused on performance, memory efficiency, and production-grade code
Familiarity with SQL and NoSQL databases, including schema design and query optimization
Ability to work autonomously and drive requirements through production
Ability to navigate unfamiliar codebases quickly
Willingness to understand financial data and formulas
Professional proficiency in English and Spanish