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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Engineer - **Company:** Hopper Platform - **Location:** Guadalajara, Spain (Remote available) - **Contract:** Permanent contract - **Skills:** Amazon Web Services, Cloud Computing, Code Review, Java Virtual Machine (JVM), Python (Programming Language), Scala (Programming Language), Software Engineering, Data Streaming, Twilio, TypeScript, Speech Recognition, WebRTC, Amazon Connect, Genesys, ReactJS, Large Language Models, Backend, Web Filtering, Event Driven Architecture, Low Latency, Speech Synthesis, Restful APIs, Microservices - **Published:** August 28, 2026 - **Apply:** https://www.adzuna.es/contact-us.html ## About the Role + 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), along with cloud infrastructure experience on GCP or AWS + A track record designing, building, and maintaining RESTful APIs, microservices, or event-driven systems + Familiarity using AI coding tools as a standard part of their workflow, with the judgment to review, correct, and own everything that ships + An operable-systems mindset, covering SLAs, observability, on-call rotations, and rollback plans + The ability to break down complex problems, make pragmatic tradeoffs, and ship iteratively, backed by strong communication across product, design, and operations + Bonus points for conversational AI or LLM orchestration experience, including speech technologies such as Deepgram, ElevenLabs, Whisper, or OpenAI Realtime + Bonus points for working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys, or LiveKit + Bonus points for experience building customer service, CRM, contact center, or workflow automation tools + Familiarity with travel industry technologies (PSS/GDS, hotel PMS/CRS) is a plus, though not required Perks and benefits of working with us ## Description HTS Assist is Hopper's agentic AI assistant for travel, resolving flight changes, cancellations, refunds, and bookings over chat and voice for some of the world's largest travel brands. We're looking for a senior full stack engineer to anchor this product, owning the realtime and voice layer end to end while building across React/TypeScript front ends, Scala and Python services, and cloud infrastructure. The team is lean and senior, ownership is broad, and the path from your code to a traveler's phone call is short. What would your day-to-day look like + Own the voice channel end to end, including telephony and CPaaS integrations (e.g., Twilio, Amazon Connect), streaming speech-to-text and text-to-speech pipelines, realtime model orchestration, and latency and quality budgets + Build product features across the stack, including web chat front ends in React/TypeScript, backend services in Scala and Python, and infrastructure on GCP + Design for multi-tenant scale, with one codebase serving many partners through configuration rather than forks + Build the safety and compliance plumbing 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 the platform capabilities forward-deployed engineers configure for partner telephony integrations and go-lives + Raise the engineering bar through code review, architecture reviews, and mentoring ## Related Videos - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Transforming Education: A Journey from interactive Markdown to Remote-Labs](https://www.wearedevelopers.com/videos/941-transforming-education-a-journey-from-interactive-markdown-to-remote-labs) - [20 billion requests a week: Upgrading Twilio's API gateway at scale](https://www.wearedevelopers.com/videos/100234-20-billion-requests-a-week-upgrading-twilio-s-api-gateway-at-scale) - [Hello JARVIS - Building Voice Interfaces for Your LLMS](https://www.wearedevelopers.com/videos/1641-hello-jarvis-building-voice-interfaces-for-your-llms) - [Raise your voice!](https://www.wearedevelopers.com/videos/10-raise-your-voice) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 132 - Binging WADFlix?](https://www.wearedevelopers.com/magazine/473-dev-digest-132-binging-wadflix)