Senior Full Stack Engineer (Realtime & Voice)

September 17, 2026

Remote

Senior

Barcelona, Spain

Description

Senior full stack role anchoring an agentic AI travel assistant that resolves flight changes, cancellations, refunds and bookings over chat and voice. The engineer owns the realtime and voice layer end to end while building across React/TypeScript front ends, Scala and Python services and GCP infrastructure. The team is lean and senior with broad ownership and a short path from code to production in a multi-tenant platform.

Responsibilities

Own the voice channel end to end, including telephony and CPaaS integrations such as Twilio or Amazon Connect
Build streaming speech-to-text and text-to-speech pipelines with realtime model orchestration and latency and quality budgets
Build product features across the stack: React/TypeScript web chat front ends, Scala and Python backend services and GCP infrastructure
Design for multi-tenant scale with one codebase serving many partners through configuration rather than forks
Build safety and compliance plumbing that 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 platform capabilities that forward-deployed engineers configure for partner telephony integrations and go-lives
Raise the engineering bar through code review, architecture reviews and mentoring

Requirements

6+ 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, TypeScript) and depth on the backend (Scala or another JVM language and/or Python)
Cloud infrastructure experience on GCP or AWS
Track record designing, building and maintaining RESTful APIs, microservices or event-driven systems
Familiarity using AI coding tools as a standard part of the workflow, with judgment to review and own everything that ships
An operable-systems mindset covering SLAs, observability, on-call rotations and rollback plans
Ability to break down complex problems, make pragmatic tradeoffs and ship iteratively with strong communication across product, design and operations
Bonus: conversational AI or LLM orchestration experience, including speech technologies such as Deepgram, ElevenLabs, Whisper or OpenAI Realtime
Bonus: working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys or LiveKit
Bonus: experience building customer service, CRM, contact center or workflow automation tools
Travel industry technologies (PSS/GDS, hotel PMS/CRS) are a plus but not required

Conditions

Well-funded startup with competitive salary and pre-IPO equity packages
Employee premiums covered for private medical and dental coverage
Private life and accident coverage
Generous parental leave above industry standards
Access to co-working space on demand through FlexDesk and a work-from-home stipend
Unlimited PTO
Monthly cash allowance for gym memberships and home office expenses
Carrot Cash travel stipend
Entrepreneurial culture with open communication and small, dynamic teams

ReactTypeScriptScalaPythonGCPAWSWebRTCSIPRESTful APIsmicroservicesevent-driven systemstravelTwilioAmazon ConnectGenesys

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