Overview 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 adaptable 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.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