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# Backend Engineer

- **Company:** Marfeel
- **Location:** Barcelona, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Big Data, Continuous Integration, Cursor (Graphical User Interface Elements), Github, MongoDB, MySQL, Node.Js, Scrum Methodology, Software Architecture, Cloud Services, TypeScript, Data Processing, Backend, Low Latency, Non-relational Database, Data Management, Front End Software Development, Vertica, Api Design, Web Architecture, Docker, Jenkins
- **Published:** August 10, 2026
- **Apply:** https://eu.experteer.com/career/view-jobs/backend-engineer-barcelona-cataluna-spanien-58861165

## About the Role

_ teams Tasks * 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 Key requirements * remote, hybrid or office-based work * home office equipment support * flexible hours and early Friday finish * health insurance for you and partner/family * training platforms and courses * referral bonus

## Description

Experteer 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. Pay / Benefits * 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 Tasks * 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 Key requirements * remote, hybrid or office-based work * home office equipment support * flexible hours and early Friday finish * health insurance for you and partner/family * training platforms and courses * referral bonus


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