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 onEnd-to-end ownership of backend initiativesHigh-performance APIs, integrations and access control systemsSecurity, permissions and data privacy at scaleClose collaboration with Product & Design in small, autonomous teamsTech stackRuby on Rails · PostgreSQL · Redis · AWS · Kubernetes(Some TypeScript & React exposure, but backend is the core focus)The team~65 engineers globally, distributed across North AmericaStrong product-driven engineering cultureHigh ownership, low bureaucracy, real-world impactOpportunity to help shape a brand-new Barcelona engineering hubLocation & setupPermanent contractHybrid model: 3 days per week remoteFlexible working hoursEquity package included (4-year vesting, 1-year cliff)23 days of paid annual leavePrivate 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 budgetCollaboration with distributed teams across Europe and North AmericaIf 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.