Ad Tech Lead — Scale Backend Systems (Rails/Go)

Titan OS Partnership; Bellprat; On-site; EUR 90,000 - 140,000; Full time

Benefits offered by this job

Private health insurance

Central Barcelona office

Diversity & international team

Career growth opportunities

Job summary

Titan Operating System S.L. (Titan OS), a Barcelona-based technology company, seeks a senior full-stack engineer with a backend focus to design and build scalable services in Ruby on Rails and Go.

You will lead a hands-on team, collaborate with Product, Data, Ad Operations and Sales to translate business needs into reliable systems while ensuring GDPR and IAB TCF compliance. The role blends architecture, coding and people management in a fast-growing CTV environment with a modern office in the

Qualifications

• 5+ years of experience as a software engineer with a strong backend focus.
• Solid production experience with Ruby on Rails and Go.
• 2+ years leading an engineering team (tech lead or manager).
• Experience designing APIs and high-performance distributed systems.
• Strong knowledge of PostgreSQL or MySQL and caching/queueing systems.

Responsibilities

• Lead, mentor and grow a team of engineers, with 1:1s and career development.
• Design and evolve services in the advertising stack (OpenRTB, SSPs/DSPs, SSAI).
• Build hands-on in Ruby on Rails and Go; contribute to frontend when needed.
• Ensure low latency, high availability, and GDPR/IAB TCF compliance.
• Collaborate with Product, Data, Ad Operations and Sales to align roadmap.

Skills

Full-stack with backend focus

Ruby on Rails

Go

Team leadership

API design

PostgreSQL

MySQL

Caching/Queueing

JavaScript/TypeScript

React

English fluency

Tools

AWS

Docker

Kubernetes

CI/CD

Redis

Kafka

Job description

Titan Operating System S.L. (Titan OS), a Barcelona-based technology company, seeks a senior full-stack engineer with a backend focus to design and build scalable services in Ruby on Rails and Go.

You will lead a hands-on team, collaborate with Product, Data, Ad Operations and Sales to translate business needs into reliable systems while ensuring GDPR and IAB TCF compliance. The role blends architecture, coding and people management in a fast-growing CTV environment with a modern office in the