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Backend Engineer

Remote, Barcelona·Full-time·Added 4 months ago

This job was published 4 months ago

Marfeel

6 open roles

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Overview

Job details

Full-time hours
Per the ad.
Fully remote
Per the ad.

Requirements

Have the right to work in Spain
Marfeel doesn't mention sponsorship in the ad.
Work in English
English is required, per the ad.
Have 5+ years of experience
Mid-level role.

Pay & benefits

What you'll get

This will be you as part of the Marfeel team:

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

Requirements

What we're looking for

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
You speak Spanish and English

Nice to have

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

The role

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.

What you'll do

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

Hiring process

Our interview process:

Phone call: covering the basics to make sure we are a good fit for each other
Technical and personal interview: understanding you professionally and personally, and answering all your questions
Test stage: a preview of the type of work, so you can see us in action too
Test review interview: we discuss your test and provide feedback

About Marfeel

Marfeel is a leading technology company in the AdTech space, specializing in progressive web apps (PWAs) and monetization solutions for digital publishers. The company provides a platform that enables publishers to create fast, engaging, and monetizable mobile web experiences, serving over 3 billion monthly page views across its network. Marfeel's technology stack includes real-time analytics, ad optimization, and a robust content delivery network, making it a key player in the digital advertising ecosystem.

Marfeel was founded in Barcelona and has its main Spanish office in Barcelona, with a strong international presence. The company is known for its innovative, engineering-driven culture and attracts top tech talent from around the world. For international professionals, Marfeel offers a dynamic, fast-paced environment with opportunities to work on cutting-edge web technologies, and its Barcelona location is a major draw for those looking to relocate to Spain. The company's work culture emphasizes autonomy, impact, and continuous learning, making it an attractive option for engineers and product specialists seeking a challenging role in the AdTech sector.

Industry: AdTech
Founded: 2011
Employees: 250–500
Headquarters: Barcelona, Spain
In Spain: Barcelona
Website: marfeel.com

Good to know if you are moving

Marfeel is headquartered in Barcelona, making it an ideal choice for professionals looking to relocate to Spain.
The company has a strong international workforce, with English as the working language, easing the transition for non-Spanish speakers.
Marfeel offers a modern tech stack (React, Node.js, Google Cloud) and a product-driven environment, attractive for engineers and product managers.
The company supports flexible remote work policies, which can be beneficial during the relocation process.
Marfeel's growth and funding rounds indicate a stable and expanding company, providing good job security for new hires.

In their own words

About the company & team

Who we are:

Marfeel is a publishing intelligence platform trusted by over 5,000 publishers worldwide: including Business Insider, Le Figaro, El País and McClatchy. We help publishers turn data into action: understanding what content is working right now, what has performed over time, and what to do next. Our platform gives editorial, SEO, audience, and revenue teams a unified view of their business, spanning real-time dashboards and deep historical analysis, all in one place.

Our international team is made up of over 15 different nationalities, with headquarters in Barcelona. Our people and our diversity are at the heart of what we build, and we are still growing.

All open roles at Marfeel