Senior Full Stack Engineer – Realtime, Voice

🕒 August 25

🇬🇧 United Kingdom – Remote

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

🇬🇧 UK Skilled Worker Visa Sponsor

This company has sponsored UK Skilled Worker visas in the past.

👻 Ghost score 11%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Hopper

WebsiteLinkedInAll Job Openings

201 - 500 employees

🏨 Hospitality

📦 Logistics

✈️ Travel

💰 $96M Venture Round on 2022-11

Hospitality • Logistics • Travel

Hopper is a travel booking platform that offers a one-stop solution for planning trips, including flights, hotels, rental cars, and homes. The platform features advanced options such as price prediction, disruption assistance, and the Price Freeze™ feature, allowing travelers to secure deals and manage changes conveniently. Hopper is known for its mobile app availability on iOS and Android, providing a streamlined experience for its users. It serves millions of travelers worldwide, offering VIP support and various affiliate programs for partners.

📋 Description

• 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 React/TypeScript front ends, Scala and Python backend services, and GCP infrastructure • Design for multi-tenant scale through configuration rather than code forks • Build safety and compliance capabilities, including guardrails, content filtering, and PII redaction integration points • Maintain revenue-critical deployments through observability, alerting, incident response, and SLA performance • Build platform capabilities for partner telephony integrations and go-lives • Contribute through code reviews, architecture reviews, and mentoring

🎯 Requirements

• 6+ years of software engineering experience • 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 React and TypeScript • Backend experience in Scala or another JVM language and/or Python • Cloud infrastructure experience on GCP or AWS • Experience designing, building, and maintaining RESTful APIs, microservices, or event-driven systems • Familiarity using AI coding tools, with judgment to review, correct, and own everything that ships • Experience with SLAs, observability, on-call rotations, and rollback plans • Ability to break down complex problems, make pragmatic tradeoffs, and ship iteratively • Strong communication across product, design, and operations • Conversational AI or LLM orchestration experience is a bonus • Experience with speech technologies such as Deepgram, ElevenLabs, Whisper, or OpenAI Realtime is a bonus • Working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys, or LiveKit is a bonus • Experience building customer service, CRM, contact center, or workflow automation tools is a bonus • Familiarity with travel industry technologies (PSS/GDS, hotel PMS/CRS) is a plus

🏖️ Benefits

• Competitive salary • Pre-IPO equity packages • 100% of employee premiums covered for a group insurance plan through Vitality Health • Automatic contributions through Smart Pension • Generous parental leave • Co-working space on demand through FlexDesk • Work-from-home stipend • Carrot Cash travel stipend • Unlimited PTO • Entrepreneurial culture • Open communication with management and company leadership • Small, dynamic teams with massive impact