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

Position: Senior Full Stack Engineer (Realtime & Voice) Customer Experience Platform
About the RoleHTS 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/Type Script 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.

What would your day-to-day look like

Own the voice channel end to end, including telephony and CPaaS integrations 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/Type Script, backend services in Scala and Python, and infrastructure on GCPDesign 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

An ideal candidate has6+ 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, Type Script) and depth on the backend (Scala or another JVM language, and/or Python), along with cloud infrastructure experience on GCP or AWSA 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

Bonus points for conversational AI or LLM orchestration experience, including speech technologies such as Deepgram, Eleven Labs, Whisper, or OpenAI Realtime Bonus points for working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys, or Live Kit Bonus  points for 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

Perks and benefits of working with usWell-funded and proven startup with large ambitions, competitive salary and the upsides of pre-IPO equity packages

Unlimited PTOCarrot Cash travel stipend

Access to co-working space on demand through Flex Desk and a work-from-home stipend

Please ask us about our 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 About Hopper At Hopper, we are on a mission to become the leading travel platform globally, powering Hopper's…