Staff Backend Engineer - Security-Focused Rails (Hybrid)

Q-tech; Barcelona; Hybrid; EUR 120,000 - 160,000; Full time

Benefits offered by this job

Equity package (4-year vesting, 1-year

Cliff

23 days of paid annual leave

Private health insurance with Adeslas

€50/month phone & home internet

€50/month public transport

€60/month gym & wellness

€500/year professional development

Job summary

Q-tech is partnering with a fast-growing international SaaS company opening a new engineering hub in Barcelona. We seek a Staff Engineer to own backend work on security management, APIs and integrations for a platform used by demanding private capital clients.

The role focuses on Ruby on Rails backend with high ownership and impact. You’ll mentor peers, drive reliability, and participate in architecture and security decisions while enjoying a hybrid setup and a comprehensive benefits package.

Qualifications

• Expertise in OAuth 2.0 is required.
• Backend-focused role with ownership on security and APIs.
• Experience with scalable security-driven architecture is a plus.

Responsibilities

• Design backend systems across IAM, APIs, and integrations with security and reliability at scale.
• Provide security leadership across the application and product.
• Lead architectural decisions for features, refactors, or integrations with security focus.
• Diagnose and resolve critical login/auth issues for customers.
• Deliver features end-to-end from design to deployment and monitoring.
• Mentor peers and share knowledge.
• Drive system reliability, performance, and maintainability.
• Participate in architecture discussions with engineering leadership.

Skills

OAuth 2.0 expertise

Tools

Ruby on Rails

PostgreSQL

Redis

AWS

Kubernetes

TypeScript

React

Job description

Q-tech is partnering with a fast-growing international SaaS company opening a new engineering hub in Barcelona. We seek a Staff Engineer to own backend work on security management, APIs and integrations for a platform used by demanding private capital clients.

The role focuses on Ruby on Rails backend with high ownership and impact. You’ll mentor peers, drive reliability, and participate in architecture and security decisions while enjoying a hybrid setup and a comprehensive benefits package.