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

Stack

Responsibilities

• ▹Own the voice channel end to end: telephony and CPaaS integrations (Twilio, Amazon Connect)
• ▹Streaming speech-to-text and text-to-speech pipelines, realtime model orchestration, latency budgets
• ▹Build product features across the stack: React/TypeScript, Scala and Python services, GCP infrastructure
• ▹Design for multi-tenant scale via configuration rather than forks
• ▹Build safety and compliance plumbing: guardrails, content filtering, PII redaction
• ▹Keep revenue-critical deployments healthy: observability, alerting, incident response, SLA performance
• ▹Build platform capabilities forward-deployed engineers configure for partner integrations
• ▹Raise the engineering bar through code review, architecture reviews, and mentoring

Requirements

• ▹6+ years of software engineering experience with senior-level ownership of production systems
• ▹Hands-on realtime systems experience (voice applications, WebRTC/SIP, streaming media)
• ▹Strength in a modern front end (React, TypeScript) and depth on the backend (Scala or another JVM language, and/or Python)
• ▹Cloud infrastructure experience on GCP or AWS
• ▹Track record designing RESTful APIs, microservices, or event-driven systems
• ▹Familiarity using AI coding tools as a standard part of the workflow
• ▹An operable-systems mindset: SLAs, observability, on-call rotations, rollback plans
• ▹Ability to break down complex problems, make pragmatic tradeoffs, communicate well
• ▹Willingness to operate as an independent contractor with own tax/VAT compliance in Ireland

Nice to have

• ▹Conversational AI or LLM orchestration experience (Deepgram, ElevenLabs, Whisper, OpenAI Realtime)
• ▹Working knowledge of cloud telephony or CPaaS platforms (Twilio, Amazon Connect, Genesys, LiveKit)
• ▹Experience building customer service, CRM, contact center, or workflow automation tools
• ▹Familiarity with travel industry technologies (PSS/GDS, hotel PMS/CRS)

Soft skills

About the company

Hopper's HTS Assist is an agentic AI assistant for travel, resolving flight changes, cancellations, refunds, and bookings over chat and voice for major travel brands.