Q-tech is colaborating with a fast-growing international SaaS company that is opening a new engineering hub in Barcelona and is looking for a Senior Software Engineer. This is a backend-focused role with high ownership and real impact, working on Identity & Access Management, APIs and integrations for a platform used by some of the most demanding customers in the private capital space. What you'll work on End-to-end ownership of backend initiatives High-performance APIs, integrations and access control systems Security, permissions and data privacy at scale Close collaboration with Product & Design in small, autonomous teams Tech stack Ruby on Rails · PostgreSQL · Redis · AWS · Kubernetes (Some TypeScript & React exposure, but backend is the core focus) The team ~65 engineers globally, distributed across North America Strong product-driven engineering culture High ownership, low bureaucracy, real-world impact Opportunity to help shape a brand-new Barcelona engineering hub Location & setup Permanent contract Hybrid model: 3 days per week remote Flexible working hours Equity package included (4-year vesting, 1-year cliff) 23 days of paid annual leave Private health insurance with Adeslas (family included) €50/month phone & home internet allowance €50/month public transport allowance €60/month gym & wellness allowance €500/year professional development budget Collaboration with distributed teams across Europe and North America If you're a senior backend engineer who enjoys building secure, scalable systems and wants to be involved early in a new team, this could be a great next step.