Overview 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 / Ventajas 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 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

📌 Senior Full Stack Engineer (Realtime & Voice) Customer Experience Platform (Barcelona)
🏢 Hopper
📍 Barcelona