Senior Full Stack Engineer (Realtime & Voice) Customer Experience Platform - barcelona

Overview
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In this role you will anchor HTS Assist, Hopper’s agentic travel assistant, by owning the real-time and voice layer end-to-end. You’ll build across React/TypeScript front ends, Scala and Python services, and cloud infrastructure to serve multiple partners from one codebase. You’ll shape scalable, multi-tenant platforms, implement safety/compliance guardrails, and drive reliable, low-latency experiences from code to customer touchpoints. This is a high-ownership, impact-driven opportunity in a fast-growing fintech travel platform.

Compensaciones / Beneficios

• competitive salary
• private medical and dental coverage
• private life and accident coverage
• unlimited PTO
• FlexDesk on demand and home office stipend
• gym and home office stipend

Responsabilidades

• Own the voice channel end-to-end, including telephony and CPaaS integrations (e.g., Twilio, Amazon Connect) and streaming speech-to-text/text-to-speech pipelines
• Build product features across the stack: React/TypeScript front ends, Scala and Python backends, and GCP infrastructure
• Design for multi-tenant scale with a single codebase configured for partners
• Develop safety and compliance plumbing (guardrails, content filtering, PII redaction)
• Maintain healthy deployments via observability, alerting, incident response, and SLA monitoring
• Configure and deploy platform capabilities for partner telephony integrations and go-lives
• Elevate engineering standards through code reviews, architecture reviews, and mentoring

Requisitos principales

• 6+ years of software engineering with ownership of production systems
• Hands-on realtime systems experience (voice applications, WebRTC/SIP, streaming media)
• Strong frontend with React/TypeScript xkdbapo and backend with Scala and/or Python; cloud experience (GCP or AWS)
• Experience designing and maintaining RESTful APIs, microservices, or event-driven systems
• Familiarity with AI coding tools and ability to review/correct code released
• Operable-systems mindset: SLAs, observability, on-call, rollback plans
• Strong problem-solving, pragmatic tradeoffs, and cross-functional communication with product/design/ops

• strong communication
• mentoring and leadership
• collaboration across cross-functional teams
• React
• TypeScript
• Scala