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# Senior Frontend Engineer

- **Company:** Quadrivia
- **Location:** Barcelona, Spain
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Acceptance Test-Driven Development, Data Security, Event-Driven Programming, OAuth, Performance Tuning, TypeScript, WebSocket, Web Strategies, WebRTC, ReactJS, Pixel Perfect, Backend, Low Latency, Front End Software Development
- **Published:** August 5, 2026
- **Apply:** https://www.buscojobs.com.es/senior-frontend-engineer-en-barcelona-ID-365601529

## About the Role

10+ years frontend experience with React/Typescript.
Experience building real-time interactive interfaces (chat, voice, agent UI).
Strong frontend architecture and performance optimization skills.
Experience working with regulated or high-risk domains (healthcare preferred).
Strong understanding of API integration, state management, WebSockets.
Oauth2 dee understanding
Proven experience with WebRTC
Excellent communicator-clear, structured, concise, preferably following S.T.A.R/S.A.R or related.
Health care/related experience
Nice To Have
Familiarity with design systems for regulated environments.
Event driven applications
Backend engineering experience

## Description

About UsQuadrivia is the health technology company behind Qu, a comprehensive, controllable, and customizable assistant AI built by clinicians, for clinicians. Addressing the urgent shortage of healthcare professionals, Qu provides real-time, personal, and reliable support for clinical tasks across the care continuum. Designed for providers, payers, and pharmaceutical companies, Qu is easy to customize and integrates seamlessly into workflows, delivering precise assistance across the care spectrum.The RoleYou will build the secure, intuitive clinician, B2B customer and patient interfaces that interact with our agent-based clinical AI system.Your role is to provide flawless, end-to-end web experience.Key ResponsibilitiesBuild high-quality frontend applications (React, Typescript).Implement secure data flows aligned to regulated environments.Build real-time interfaces for chat, voice, clinical workflows, audit/quality tools, operational flows.Collaborate closely with design, clinical teams, Q.A engineers, and backend engineers.Ensure accessibility, clarity, and safety in every UI element.Maintain strict performance, latency, and reliability standards.Ship pixel-perfect, test-driven components with strong CI/testing.Required Experience10+ years frontend experience with React/Typescript.Experience building real-time interactive interfaces (chat, voice, agent UI).Strong frontend architecture and performance optimization skills.Experience working with regulated or high-risk domains (healthcare preferred).Strong understanding of API integration, state management, WebSockets.Oauth2 dee understandingProven experience with WebRTCExcellent communicator-clear, structured, concise, preferably following S.T.A.R/S.A.R or related.Health care/related experienceNice To HaveFamiliarity with design systems for regulated environments.Event driven applicationsBackend engineering experienceWhat Success Looks LikeClinicians, customers, internal sales and patients trust the interface instantly, no flaws.Lightning-fast UI performance even under heavy data loads.Frontend accelerates-not slows-clinical workflows.Components easy to maintain and fast to deliver


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