Marfeel is a publishing intelligence platform trusted by over 5,000 publishers worldwide: including Business Insider, Le Figaro, El País and McClatchy. We help publishers turn data into action: understanding what content is working right now, what has performed over time, and what to do next. Our platform gives editorial, SEO, audience, and revenue teams a unified view of their business, spanning real-time dashboards and deep historical analysis, all in one place.
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Our international team is made up of over 15 different nationalities, with headquarters in Barcelona. We are looking for a Backend Engineer to join a small, high-ownership engineering team working on new product initiatives. You use AI coding tools as a core part of how you work, and you are excited about what that unlocks. You will own backend architecture decisions and work closely with product and data to ship reliable, high-performance services at scale.
Design, build and maintain backend services using Node.Js
Work with large-scale data systems, including ClickHouse and other relational and non-relational databases
Work in an Agile environment with short, focused sprints
Collaborate closely with product, data and frontend teams
5+ years of experience building backend services in production environments
~ Strong proficiency in Node.Js and TypeScript
~ Solid experience with relational and non-relational databases (MySQL, MongoDB, ClickHouse or similar columnar databases)
~ Deep understanding of API design, data modeling, and web architecture
~ Strong focus on performance: you think about query efficiency, latency and scale by default
~ You use AI coding tools: Experience with CI/CD pipelines and cloud deployments (Docker, GitHub Actions, Jenkins or similar)
~ Familiar with testing practices including unit, integration and end-to-end testing
~ You speak Spanish and English
Experience with ClickHouse or other OLAP / columnar databases
Familiarity with real-time data pipelines or streaming data (Kafka, event ingestion APIs)
Experience building data-intensive backend services at scale
Experience designing or working with middleware layers: API gateways, request pipelines, data transformation services or similar
Knowledge of PHP and/or Java/Spring
Experience integrating AI tooling into development workflows in a meaningful way: using agents, MCP servers, or AI-assisted development xhfqzwm at team level
Active contributions to open-source projects
Option to work full remote, hybrid or office-based (if in BCN area)
Support with home office equipment
Flexible hours and early finish on Fridays
Subsidized health insurance for you and your partner/family (Adeslas)
Subsidized monthly plan to a large network of health and wellness centers (Wellhub)
Free language classes (English/Spanish)
Open-space, light-filled and eco-conscious office with large sunny terrace (if BCN based)
Unlimited refreshments including coffee, tea and soft drinks at the office (if BCN based)
Access to training platforms, courses and materials
Test stage : a preview of the type of work, so you can see us in action too
Test review interview : we discuss your test and provide feedback