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

In this role, you anchor HTS Assist, Hopper’s agentic AI for travel, owning the real-time voice layer end-to-end and delivering across web and backend services. You will work on telephony, CPaaS integrations, streaming speech pipelines, and latency-aware orchestration to support flight changes, cancellations, refunds, and bookings. You’ll collaborate with cross-functional teams to ship scalable features that power travel experiences for partners and customers. The role offers high ownership in a lean, senior team with meaningful impact on core travel workflows.

• competitive salary
• pre-IPO equity benefits
• health insurance through Vitality Health
• Smart Pension contributions
• generous parental leave
• work-from-home stipend

• Own the voice channel end-to-end, including telephony integration and CPaaS (e.g., Twilio, Amazon Connect)
• Develop and maintain streaming speech-to-text and text-to-speech pipelines
• Build features across React/TypeScript front ends and Scala/Python backend services
• Design for multi-tenant scale with a single codebase configured for partners
• Implement safety, compliance, guardrails, content filtering, and PII redaction integration points
• Maintain platform health via observability, alerts, incidents, and SLA adherence
• Configure and support go-lives for partner telephony integrations
• Raise engineering bar through code reviews, architecture reviews, and mentoring

• 6+ years of software engineering with ownership of production systems
• Hands-on realtime systems experience (e.g., voice apps, WebRTC/SIP, streaming media)
• Strong frontend (React, TypeScript) and backend (Scala or JVM language, and/or Python) with cloud infra on GCP or AWS
• Experience designing/maintaining RESTful APIs, microservices, or event-driven systems
• Familiarity with AI coding tools and the ability to review and own shipped code
• Operable-systems mindset: SLAs, observability, on-call rotations, rollback plans
• Ability to break down complex problems, make pragmatic tradeoffs, and ship iteratively
• Bonus: conversational AI/LLM orchestration, speech tech (Deepgram, ElevenLabs, Whisper, OpenAI) and cloud telephony/CPaaS platforms
• Bonus: experience building customer service, CRM, contact center, or workflow automation tools
• Bonus: familiarity with travel tech (PSS/GDS, hotel PMS/CRS)

• strong communication across product, design, and operations
• mentoring and code review leadership
• pragmatic decision-making and prioritization
• React/TypeScript
• Scala
• Python