Senior Backend Engineer (Ruby on Rails)

Titan OS Partnership; Barcelona; On-site; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Private health insurance

International work environment

Job summary

Titan OS is seeking a Senior Backend Engineer in Barcelona to join its growing team. You will design, build, and maintain scalable server-side architectures powering our innovative TV and digital advertising products, with a focus on reliability, security, and performance.

The ideal candidate has 7+ years of backend experience, expert Ruby on Rails, strong database knowledge (SQL/NoSQL), and hands-on cloud and containerization skills (AWS/GCP/Azure, Docker, Kubernetes).

Qualifications

• 7+ years of professional backend experience.
• Proficiency in Ruby on Rails.
• Strong knowledge of SQL and NoSQL databases.
• Experience with cloud platforms (AWS/GCP/Azure) and containerization.
• Strong RESTful API design and integration experience.

Responsibilities

• Designing and developing highly scalable backend services and APIs.
• Building and maintaining databases securely and efficiently.
• Collaborating with front-end, DevOps, and product teams to define features.
• Optimising performance and reliability of server-side code.
• Ensuring backend security through best practices and protocols.
• Writing clean, documented code following standards and team practices.
• Monitoring and troubleshooting production systems with high availability.

Skills

Ruby on Rails

RESTful API design

SQL

NoSQL

AWS

GCP

Azure

Docker

Kubernetes

English communication

Education

Bachelor's degree in CS/Software Engineering

Tools

Docker

Kubernetes

Job description

Is this you?

Titan Operating System S.L. (Titan OS), the Barcelona-based technology, entertainment, and advertising company, is looking for you!

At TitanOS, we live by three core values:

• Make things happen - We take ownership, move fast, and deliver impact
• No ego - We collaborate with respect and humility to reach shared goals
• Show genuine passion - We love what we do and never stop learning

Role overview:

We are looking for a Senior Backend Engineer with a deep understanding of server-side technologies and a passion for building highly scalable systems that power industry-leading applications. You will be responsible for designing, developing, and maintaining the backend infrastructure that drives our products and services, ensuring they are secure, reliable, and performant.

You’ll be instrumental in architecting and delivering robust solutions that power the core functionality of our business. This role is for someone who thrives on solving complex problems and is driven by the desire to contribute to a high-impact product every day.

Key Responsibilities

• Designing and developing highly scalable backend services and APIs to support front-end applications and third-party integrations
• Building and maintaining databases, ensuring data is stored securely and can be accessed efficiently
• Collaborating with front-end developers, DevOps, and product teams to define and implement new features
• Optimising the performance and reliability of server-side code to ensure seamless user experiences
• Ensuring the security of backend systems through the implementation of best practices and security protocols
• Writing clean, maintainable, and well-documented code, adhering to industry standards and team best practices
• Monitoring and troubleshooting production systems, ensuring high availability and rapid response to issues
• Participating in code reviews and contributing to the continuous improvement of development processes

Requirements

What makes you a great fit:

• +7 years of professional experience as a Backend Engineer, working on large-scale systems
• Proficiency in Ruby on Rails
• Strong knowledge of database systems (SQL and NoSQL), with experience in designing efficient data architectures
• Experience with cloud platforms like AWS, GCP, or Azure, and familiarity with containerization tools like Docker and Kubernetes
• Solid understanding of RESTful API design and development, including experience integrating third-party services
• A strong focus on performance optimization, scalability, and security
• Excellent problem-solving skills and attention to detail
• A Bachelor's degree in Computer Science, Software Engineering, or a related field is preferred but not required
• Strong communicator and fluent in English

Benefits

Reasons to apply:

• Competitive compensation
• Private health insurance
• Friendly, diverse, and international work environment
• Opportunity to work outside of your comfort zone and develop professionally in an exciting and fast-growing CTV industry
• Change the future of TV! A unique opportunity to join a well-funded, high-growth company in the early stages to help shape a product/business that will impact millions