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

Hopper•Austin, TX

23h•Remote

About The Position

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.

Requirements

6+ years of software engineering experience, with senior-level ownership of production systems and genuine full-stack range
Hands-on realtime systems experience, such as voice applications, WebRTC/SIP, streaming media, or comparable low-latency products
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
A track record designing, building, and maintaining RESTful APIs, microservices, or event-driven systems
Familiarity using AI coding tools as a standard part of their workflow, with the judgment to review, correct, and own everything that ships
An operable-systems mindset, covering SLAs, observability, on-call rotations, and rollback plans
The ability to break down complex problems, make pragmatic tradeoffs, and ship iteratively, backed by strong communication across product, design, and operations

Nice To Haves

Conversational AI or LLM orchestration experience, including speech technologies such as Deepgram, ElevenLabs, Whisper, or OpenAI Realtime
Working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys, or LiveKit
Experience building customer service, CRM, contact center, or workflow automation tools
Familiarity with travel industry technologies (PSS/GDS, hotel PMS/CRS) is a plus, though not required

Responsibilities

Own the voice channel end to end, including telephony and CPaaS integrations (e.g., 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
Build the platform capabilities forward-deployed engineers configure for partner telephony integrations and go-lives
Raise the engineering bar through code review, architecture reviews, and mentoring

Benefits

Well-funded and proven startup with large ambitions, competitive salary and the upsides of pre-IPO equity packages
Unlimited PTO
Carrot Cash travel stipend
Access to co-working space on demand through FlexDesk and a work-from-home stipend
Very generous parental leave, much above industry standards
Entrepreneurial culture where pushing limits and taking risks is everyday business
Open communication with management and company leadership
Small, dynamic teams, massive impact
100% employer-paid Medical, Dental and Vision coverage for employees
Access to Disability and Life insurance
Health Reimbursement Account (HRA)
DCA/FSA and access to a 401k plan