- 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

- 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

Benefits

- Competitive salary: We compete with top-tier tech companies for world-class talent, and we win much more frequently than we lose

- Unlimited time off: We’re a travel company. We actually mean it. Unlimited time off and an annual winter shut-down, we work hard, but we know how important it is to relax

- App Perks: Unlimited free VIP Support with every purchase on Hopper and an annual $200 USD Carrot Cash voucher to kick start your travel fund.

- Fully-remote workplace: Hopper made the decision early on in 2020 to fully embrace remote work. Since then, we have ditched our full-time offices and hired hundreds of people across every US state, Canadian province and dozens of countries around the world. We’re never going back to the old way of working.

- Coworking spaces on demand: For those who do value having a workspace out of the home, we offer optional access to coworking spaces.



In some cities - Boston, London, Montreal, Paris and Toronto - we even have dedicated coworking spaces just for Hopper.

- Pre-IPO equity: Hopper gives employees the choice between stock options and restricted stock units as part of their total compensation package. When choosing stock options, employees don’t have to worry about short exercise periods if they later choose to move on. Instead we offer up to four years to exercise options after employment, depending on length of tenure.

- Evergreen equity program: We want to retain our highly valued employees. So when an employee is more than 50% of the way to vesting all of their options or RSUs, we refresh their grant. It’s as simple as that.

- Healthcare coverage: 100% healthcare cost coverage in the United States and Canada for our employees, with competitive offerings in other countries.

- Parental leave: We encourage our team members to take the time they need to transition to parenthood. In the United States and Canada, we offer top-up payments to 100% of salary for 12-18 week for primary parents and 6-10 weeks for secondary parents. In other countries, we complement national policies on parental leave with similar top-up components.

- Work from Anywhere: Our culture says to “work from anywhere,” and we mean it. Our legal team has created a program to provide visa sponsorship and immigration assistance to both new employees and existing employees who (voluntarily) wish to relocate to any of the countries we can support (eleven and counting).

- Internal career mobility program: We put a lot of effort into recruiting the best people. We also want to retain the best people. To facilitate internal career development, we created a program that lets any employee in good standing who has worked at Hopper for at least 6-12 months apply to any job opening at the company to be considered for both promotions and lateral transfers.

- A culture of performance:



Adequate performance at Hopper receives a generous severance package. Inspired by Netflix, we employ the “keeper test” at scheduled intervals to ask leaders to re-assess their team members’ competencies, contributions and answer the simple question: “would you hire this person again?”. The upside of this is that we have built a dream team of top performers who also make great teammates.

- Light internal meeting culture: Not only do we not like meetings; we actively discourage them. We ask that no one starts their week with more than 25% of their calendar booked internally and have created a guide full of tips to help people avoid meeting overload.

- Severance program: Sometimes things don’t work out. Hopper offers a market-leading severance program that grants every ex-employee some severance - up to 7 months depending on length of tenure - to help mitigate the financial impact of the unexpected.
- Bonus points for experience building customer service, CRM, contact center, or workflow automation tools
- A track record designing, building, and maintaining RESTful APIs, microservices, or event-driven systems

- Familiarity with travel industry technologies (PSS/GDS, hotel PMS/CRS) is a plus, though not required

- 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

- 6+ years of software engineering experience, with senior-level ownership of production systems and genuine full-stack range
- The ability to break down complex problems, make pragmatic tradeoffs, and ship iteratively, backed by strong communication across product, design, and operations

- 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

- Bonus points for working knowledge of cloud telephony or CPaaS platforms such as Twilio, Amazon Connect, Genesys, or LiveKit

- Hands-on realtime systems experience, such as voice applications, WebRTC/SIP, streaming media, or comparable low-latency products

- Bonus points for conversational AI or LLM orchestration experience, including speech technologies such as Deepgram, ElevenLabs, Whisper, or OpenAI Realtime

📌 Senior Full Stack Engineer (Realtime & Voice, Customer Experience Platform) (España)
🏢 Hopper
📍 España