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

Hopper
Madrid, Barcelona, Spain
Workplace: RemoteFull timeFunction: Customer Success & Account ManagementExperience: 6+ yearsSkills: ["Communication","Mentoring","Problem-solving","Iterative execution","Pragmatic decision-making"]

Own the end-to-end realtime and voice layer of an agentic AI assistant that resolves travel changes, cancellations, refunds, and bookings via chat and phone. Build across React/TypeScript front ends, Scala/Python services, and GCP infrastructure. Design for multi-tenant scale, implement safety/compliance controls, and keep revenue-critical deployments healthy with observability and incident response—while mentoring and raising the engineering bar.

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Hopper
Hopper
4 days ago

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

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

Source: Company careers pageValidated by: Fursa AI
Last checked: 10 hours agoStatus: Live

Job Summary

Own the end-to-end realtime and voice layer of an agentic AI assistant that resolves travel changes, cancellations, refunds, and bookings via chat and phone. Build across React/TypeScript front ends, Scala/Python services, and GCP infrastructure. Design for multi-tenant scale, implement safety/compliance controls, and keep revenue-critical deployments healthy with observability and incident response—while mentoring and raising the engineering bar.
Location: Madrid, Barcelona, Spain
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 and CPaaS integrations, streaming speech-to-text/text-to-speech pipelines, realtime model orchestration, and latency/quality budgets
  • •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 one codebase served via configuration for many partners
  • •Implement safety and compliance plumbing for enterprise partners, including guardrails, content filtering, and PII redaction integration points
  • •Maintain revenue-critical deployments using observability, alerting, incident response, and SLA performance; raise the engineering bar through reviews and mentoring

Pay and Benefits

Perks:Health InsuranceDentalLife InsuranceAccident CoverageParental LeaveRemote WorkPaid LeaveGym MembershipHome OfficeCo-working SpaceTravel Allowance

Key Requirements

  • •6+ years of software engineering experience with senior-level ownership across production systems and a 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, with backend depth in Scala (JVM) and/or Python, plus cloud experience on GCP or AWS
  • •A track record 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+ years
Skills:CommunicationMentoringProblem-solvingIterative executionPragmatic decision-making
Tech Stack:ReactTypeScriptScalaPythonGCPAWSTwilioAmazon ConnectWebRTCSIPCPaaSRESTful APIsMicroservicesEvent-driven systemsStreaming speech-to-textText-to-speechPII redactionObservabilityIncident responseSLA

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
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Glassdoor: 3.2
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