Overview
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In this role you will build and maintain backend services at scale for Marfeel’s analytics platform. You will own architectural decisions and collaborate with product and data teams to deliver reliable, high-performance APIs and data processing capabilities. You’ll work with large-scale data, real-time and historical datasets, and leverage AI coding tools to accelerate delivery. This is a hands-on position in a small, high-ownership team focused on new product initiatives and growth for publishers worldwide.
Compensaciones / Beneficios
remote, hybrid or office-based work
home office equipment support
versátil hours and early Friday finish
health insurance for you and partner/family
training platforms and courses
referral bonus
Responsabilidades
Design, build and maintain backend services using Node.js
Work with large-scale data systems (ClickHouse and other relational/non-relational databases)
Build and maintain APIs powering the analytics product across real-time and historical datasets




Ensure services are performant, scalable and maintainable
Contribute to architectural decisions for new product features
Work in Agile sprints and collaborate with product, data and frontend teams
Requisitos principales
5+ years of production backend experience
Strong proficiency in Node. xqbhyrx js and TypeScript
Relational and non-relational databases such as MySQL, MongoDB, ClickHouse or similar
Deep understanding of API design, data modeling and web architecture
Performance-focused: query efficiency, latency, and scale
Experience using AI coding tools (Claude Code, Cursor, Copilot) as part of development
CI/CD and cloud deployments (Docker, GitHub Actions, Jenkins)
Ownership mindset and ability to handle complex technical problems
Experience with testing practices (unit, integration, end-to-end)
Proficiency in Spanish and English
ownership and accountability
collaboration across product, data and frontend teams
problem solving and analytical thinking
Node.js
TypeScript
MySQL

📌 Backend Engineer (Barcelona)
🏢 Marfeel
📍 Barcelona