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Hopper is seeking a Senior Full Stack Engineer to anchor HTS Assist, an agentic AI assistant that resolves flight changes, cancellations, refunds, and bookings via chat and voice for major travel brands. You will own the realtime and voice layer end-to-end, spanning React/TypeScript frontends, Scala and Python services, and GCP infrastructure.
Day-to-day responsibilities include: owning the voice channel completely—telephony and CPaaS integrations (Twilio, Amazon Connect), streaming speech-to-text and text-to-speech pipelines, realtime model orchestration, and latency/quality budgets; building product features across the full stack (React/TypeScript web chat, Scala/Python backends, GCP infrastructure); designing for multi-tenant scale with one codebase serving many partners; implementing safety and compliance plumbing (guardrails, content filtering, PII redaction); maintaining revenue-critical deployments through observability, alerting, and incident response; enabling forward-deployed engineers to configure partner integrations; and raising the engineering bar through code review and mentoring.
Ideal candidates bring 6+ years of software engineering with senior-level production ownership and genuine full-stack range. You have hands-on realtime systems experience (voice applications, WebRTC/SIP, streaming media, or low-latency products). You're strong in modern frontend (React, TypeScript) and backend (Scala or JVM language, and/or Python), with cloud infrastructure experience on GCP or AWS. You've designed and maintained RESTful APIs, microservices, or event-driven systems. You use AI coding tools as standard workflow, with judgment to review and own everything shipped. You have an operable-systems mindset covering SLAs, observability, on-call, and rollback plans. You break down complex problems, make pragmatic tradeoffs, and ship iteratively with strong cross-functional communication.
Bonus experience includes conversational AI or LLM orchestration (Deepgram, ElevenLabs, Whisper, OpenAI Realtime), cloud telephony or CPaaS platforms (Twilio, Amazon Connect, Genesys, LiveKit), customer service/CRM/contact center/workflow automation tools, or travel industry technologies (PSS/GDS, hotel PMS/CRS).
Hopper is a well-funded, proven startup with large ambitions, offering competitive salary and pre-IPO equity. Benefits include unlimited PTO, Carrot Cash travel stipend, on-demand co-working through FlexDesk, work-from-home stipend, generous parental leave, entrepreneurial culture, open leadership communication, small dynamic teams with massive impact, and 100% employer-paid Medical/Dental/Vision coverage, plus Disability/Life insurance, HRA, DCA/FSA, and 401k access.
