About the job

We are a cutting-edge ad-tech company: we process more than 4.5 million ad requests per second, replying under 100ms (for reference, the Google search engine handles ~76,000 QPS). Every day we generate several TBs of data that need to be processed, analyzed and aggregated, so our real-time components get smarter every day.

The Team

Core engineering team: 8 experienced engineers responsible for maintaining and evolving the real-time bidding (Open-RTB) auction system that powers the entire business. Fast-paced, supportive environment, knowledge sharing, autonomy.

What Will You Do

"You build it, you run it" philosophy — short-cycle tasks across the core platform, code reviews, technical/architectural decisions.

Key Responsibilities

- Feature Ownership: Design, develop and implement new features for core products using NodeJS and Java.

- Quality Assurance: Write clean, efficient, testable code; test locally and in a sophisticated staging environment.

- Operational Excellence: Monitor deployments, ensure stability, reliability and performance of production systems.

- Agile Collaboration: Participate in planning and progress reporting.

Requirements

- Bachelor's degree in Computer Science or related technical field.

- 5+ years of experience in a software engineering role.





- Hands-on experience with Java or NodeJS.

- Solid theoretical foundation in data structures, algorithms and software design principles.

- Genuine passion for technology, eagerness to learn.

- Excellent English (written and spoken).

- Proficiency with Linux, Git, Docker and Docker-Compose.

- Experience with testing tools and modern CI/CD frameworks.

Bonus Points

- Experience with Key-Value stores and in-memory databases (Redis, Memcached).

- Familiarity with cloud environments, particularly AWS.

Tech Stack

- Languages: Java, NodeJS, Bash, Python

- Databases: MySQL

- Cloud & DevOps: AWS, Jenkins, Docker

- Tools: Git, Jira, Notion

What They Offer

- Highly motivated, young and dynamic team.

- Great compensation package.

- Office in central Barcelona (rooftop terrace, BBQ, stocked fridge).

- Work-life balance: WFH 2 days/week, versátil hours.

- Meal vouchers (Ticket Restaurant).

- Monthly gym allowance (DiR or Wellhub).

- LinkedIn Learning and training opportunities.

- Monthly TGIF events, regular team-building.

- International team (40+ countries).

No visa sponsorship — candidates must already have a legal permit to work in Spain.

📌 Backend Developer | Senior (España)
🏢 Importante empresa
📍 España