Backend Engineer

Marfeel; Barcelona; Híbrido; EUR 50.000 - 70.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Option to work full remote, hybrid or office-based

Support with home office equipment

Flexible hours and early finish on Fridays

Subsidized health insurance

Free language classes

Access to training platforms

Descripción de la vacante

Marfeel is looking for a Backend Engineer to join their team in Barcelona. You will design and maintain backend services, utilizing Node.js and various databases while ensuring high performance and scalability of applications. The ideal candidate will have over 5 years of experience with a solid understanding of API design and cloud deployments. Benefits include options for remote work, subsidized health insurance, and flexible hours, amid a supportive and eco-conscious work environment.

Formación

• 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.

Responsabilidades

• Design, build and maintain backend services using Node.js.
• Work with large-scale data systems, including ClickHouse.
• Build and maintain APIs that power analytics products.

Conocimientos

Node.js

TypeScript

API design

Data modeling

Performance optimization

Herramientas

ClickHouse

MySQL

MongoDB

Docker

GitHub Actions

Descripción del empleo

The Role

We are looking for a Backend Engineer to join a small, high-ownership engineering team working on new product initiatives. You will be primarily focused on new product initiatives, building new services and features, though you may occasionally need to navigate existing codebases. 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.

This Is What You Will Do

• Design, build and maintain backend services using Node.js
• Work with large-scale data systems, including ClickHouse and other relational and non-relational databases
• Build and maintain APIs that power our analytics product, working across real-time and historical datasets
• Ensure services are performant, scalable, and maintainable
• Contribute to architectural decisions for new product features
• Work in an Agile environment with short, focused sprints
• Collaborate closely with product, data and frontend teams

This Is You

• 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: Claude Code, Cursor, Copilot or similar, as a natural part of your development workflow, not as an afterthought
• Experience with CI/CD pipelines and cloud deployments (Docker, GitHub Actions, Jenkins or similar)
• You enjoy working on complex technical problems and take ownership of your solutions
• Familiar with testing practices including unit, integration and end-to-end testing

We Will Be Impressed By Experience In

• 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 at team level
• Active contributions to open‑source projects

Benefits

• Work on product that reaches publishers and newsrooms globally
• 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)
• Transport, restaurant and kindergarten tickets (Cobee)
• 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)
• Loyalty vacation days
• Access to training platforms, courses and materials
• Referral bonus for talent brought to us by you