About The Role HTS Assist is Hopper's agentic AI assistant for travel, resolving flight changes, cancellations, refunds, and bookings over chat and voice for some of the world's largest travel brands. We're looking for a senior full stack engineer to anchor this product, owning the realtime and voice layer end to end while building across React/TypeScript front ends, Scala and Python services, and cloud infrastructure. The team is lean and senior, ownership is broad, and the path from your code to a traveler's phone call is short.

Twilio, Amazon Connect), streaming speech-to-text and text-to-speech pipelines, realtime model orchestration, and latency and quality budgets Build product features across the stack, including web chat front ends in React/TypeScript, backend services in Scala and Python, and infrastructure on GCP Design for multi-tenant scale, with one codebase serving many partners through configuration rather than forks Build the safety and compliance plumbing enterprise partners audit, including guardrails, content filtering, and PII redaction integration points Keep revenue-critical deployments healthy through observability, alerting, incident response, and SLA performance 6+ years of software engineering experience, with senior-level ownership of production systems and genuine full-stack range ~ Strength in a modern front end (React, TypeScript) and depth on the backend (Scala or another JVM language, and/or Python), along with cloud infrastructure experience on GCP or AWS ~ Familiarity using AI coding tools as a standard part of their workflow, with the judgment to review, correct,



and own everything that ships ~ Bonus points for working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys, or LiveKit ~ Bonus points for experience building customer service, CRM, contact center, or workflow automation tools ~ Hopper covers the cost of employee premiums for private medical and dental coverage Access to co-working space on demand through FlexDesk and a work-from-home stipend Hopper offers a monthly cash allowance for gym memberships and to cover home office expenses for a comfortable remote working experience Carrot Cash travel stipend By leveraging massive amounts of data and advanced machine learning algorithms, Hopper combines its world-class travel agency offering with proprietary fintech products to bring transparency, flexibility and savings to travelers globally. In recent years, we've grown into a travel fintech provider, commerce platform, and integral travel agency that powers some of the world's largest brands. Today, our partners include leading travel brands like Capital One, Nubank, Air Canada, and many more.

Hopper is now the #3 largest online travel agency in North America and 70% of our app customers are Gen Z and millennial travelers. HTS is primed to continue its growth as the leading travel ecommerce provider in a $1 trillion online shopping category. Under local regulations, you have the right to understand the principal factors used in this assessment, request a correction of your data, or request a human review of any automated decision.

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