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.We are seeking experienced developers who would like to work in Ruby on Rails (not previous experience required).YOU MUST HAVE:Expertise in OAuth 2.0What you'll work onDesign, build and iterate on backend-heavy systems across IAM, APIs, internal and external integrations, ensuring security, privacy and reliability at scale.Provide security leadership across the whole application, resolving issues that affect the product as a whole.Lead technical decision-making when designing new features, refactors or integrations where security is a critical factor.Diagnose and resolve critical issues, such as customers being unable to log in due to authorization failures.Deliver features end-to-end, from design through deployment and monitoring.Mentor peers.Drive system reliability,



performance and maintainability.Engage in architecture discussions with wider engineering leadership.Tech 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.

📌 Senior Software Engineer (España)
🏢 Q-Tech
📍 España