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

Adaptable 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

📌 Backend Engineer (Madrid)
🏢 Marfeel
📍 Madrid