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

Hopper
England, London
Workplace: RemoteFull timeFunction: Customer Success & Account ManagementExperience: 6+ yearsSkills: ["Communication","Judgment","Problem-solving","Ownership","Mentoring"]

Own the end-to-end realtime and voice layer of an agentic AI assistant for travel. Build across React/TypeScript web chat, Scala and Python backend services, and GCP infrastructure while designing for multi-tenant scale. Implement safety and compliance plumbing, keep revenue-critical deployments healthy with observability and incident response, and raise engineering standards through reviews and mentoring.

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Hopper
Hopper
3 days ago

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

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 15 hours agoStatus: Live

Job Summary

Own the end-to-end realtime and voice layer of an agentic AI assistant for travel. Build across React/TypeScript web chat, Scala and Python backend services, and GCP infrastructure while designing for multi-tenant scale. Implement safety and compliance plumbing, keep revenue-critical deployments healthy with observability and incident response, and raise engineering standards through reviews and mentoring.
Location: England, London
Workplace: Remote
Employment Type: Full time
Job Function: Customer Success & Account Management
Seniority: Mid level

Key Responsibilities

  • •Own the voice channel end to end, including telephony/CPaaS integrations, streaming speech-to-text and text-to-speech pipelines, and realtime model orchestration.
  • •Build product features across the stack: web chat front ends in React/TypeScript, backend services in Scala and Python, and infrastructure on GCP.
  • •Design for multi-tenant scale using a single codebase serving many partners via configuration.
  • •Implement safety and compliance plumbing for enterprise partners, including guardrails, content filtering, and PII redaction integration points.
  • •Maintain revenue-critical deployments with observability, alerting, incident response, and SLA performance, and raise the engineering bar via reviews and mentoring.

Pay and Benefits

Perks:Health InsurancePensionParental LeaveRemote WorkPaid LeaveTravel Allowance

Key Requirements

  • •6+ years of software engineering experience with senior-level ownership across production systems and full-stack work.
  • •Hands-on realtime systems experience, such as voice applications, WebRTC/SIP, streaming media, or comparable low-latency products.
  • •Strong modern front-end skills (React, TypeScript) and depth on the backend (Scala/JVM and/or Python), plus cloud experience on GCP or AWS.
  • •Experience designing, building, and maintaining RESTful APIs, microservices, or event-driven systems.
  • •An operable-systems mindset covering SLAs, observability, on-call rotations, and rollback plans.
Experience:6+ yearsSaaSReal-time systemsCloud infrastructureMicroservicesEvent-driven systemsConversational AI
Skills:CommunicationJudgmentProblem-solvingOwnershipMentoring
Tech Stack:ReactTypeScriptScalaPythonGCPAWSWebRTCSIPRESTful APIsMicroservicesEvent-driven systemsCPaaSTwilioAmazon ConnectDeepgramElevenLabsWhisperOpenAI RealtimeGDSPSS

Company Brief

Hopper
Hopper is a mobile-first travel marketplace and travel-tech provider (HTS) that uses machine learning and fintech ancillaries (Price Freeze, disruption protection) to power consumer bookings and white-label partner travel portals globally.
Industry: TravelTech
Company Size: Large (251 to 1,000 employees)
Revenue: USD 500M to 1B
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series E+
Headquarters: Montreal, Canada
Founded: 2007
Glassdoor
Glassdoor: 3.2
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