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Senior Backend Software Engineer - Payments & Fraud

Hopper

Spain Remote permanent

Posted: November 24, 2025

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Job Description

About the job

Hopper Technology Solutions (HTS) Checkout combines market-leading payment services and best-in-class fraud detection to enhance the travel experience for users and drive revenue for partners. Our hosted checkout solution offers global coverage and currency support, a comprehensive suite of payment methods and an industry-leading anti-fraud technology.

We are seeking a senior backend software engineer with experience building scalable and robust systems to join our team. As part of a cross-functional team of exceptional engineers and product managers, you will develop new features and provide best-in-class support to help our partners scale their businesses.

Tech stack:

• Our backend systems are written in Scala, and we use a suite of GCP services with extensive use of GKE, Pub/Sub, BigQuery, and Spanner

• Containerized microservices architecture with over 200+ services running primarily in Google Cloud Kubernetes

• We are heavily data-driven, making extensive use of tools like Amplitude, BigQuery, and Datadog

What would your day-to-day look like

• Design, build and review code for our fraud and abuse backend platform

• Iterate on features using Scala (no prior experience required) and technologies within GCP

• Ship your first code in days, iterating on features in an agile manner

• Operate autonomously but work closely with engineers and PMs to ensure high alignment

• Collaborate cross-functionally with the product team and other Hopper teams

• We operate with few meetings and emphasize strong alignment and asynchronous decision making

An ideal candidate has

• 4+ years of experience building scalable backend systems

• A strong understanding of distributed systems and how architectural decisions affect performance and maintainability

• The ability to work with minimal guidance, be proactive and to handle uncertainty, ambiguity and the challenge of quickly evolving goals

• Excelled in cross-functional teams, working fluidly with Product Managers, Data Scientists, Frontend Engineers, and other highly skilled specialists

• Prior experience in the payments and fraud space a plus

Perks and benefits of working with us:

• Well-funded and proven startup with large ambitions, competitive salary and the upsides of pre-IPO equity packages.

• Hopper covers the cost of employee premiums for private medical and dental coverage.

• Please ask us about our very generous parental leave, much above industry standards!.

• Hopper also offers private life and accident coverage.

• Access to co-working space on demand through FlexDesk AND Work-from-home stipend.

• Unlimited PTO.

• Hopper offers a monthly cash allowances for gym memberships and to cover home-office expenses for a comfortable remote working experience.

• Carrot Cash travel stipend.

• Entrepreneurial culture where pushing limits and taking risks is everyday business.

• Open communication with management and company leadership.

• Small, dynamic teams = massive impact.

#LI-REMOTE

More about Hopper

At Hopper, we are on a mission to become the leading travel platform globally – powering Hopper’s mobile app, website and our B2B business, HTS (Hopper Technology Solutions). By leveraging massive amounts of data and advanced machine learning algorithms, Hopper combines its world-class travel agency offering with proprietary fintech products to bring transparency, flexibility and savings to travelers globally. We have developed several unique fintech solutions that address everything from pricing volatility to trip disruptions – helping people travel better and save more on their trips.

The Hopper platform serves hundreds of millions of travelers globally and continues to capture market share around the world. he Hopper app has been downloaded over 120 million times and has become largely popular among younger travelers – with 70% of its users being Gen Z and millennials.

While everyone knows us as the Gen Z and Millennial travel app, Hopper has evolved to become much more than that. In recent years, we’ve grown into a travel fintech provider, commerce platform, and global travel agency that powers some of the world’s largest brands.

Through HTS, our B2B division, the company supercharges its partners’ direct channels by integrating our fintech products on their sites or powering end-to-end travel portals. Today, our partners include leading travel brands like Capital One, Nubank, Air Canada, and many more.

Here are just a few stats that demonstrate the company’s recent growth:

Billions of dollars worth of travel and travel fintech are sold through Hopper and HTS’ channels every year.

Our fintech products – including Cancel for Any Reason and Flight Disruption Assistance – have exceptionally strong CSAT because the terms are always clear, and customers receive instant, no-questions-asked resolutions.

Almost 30% of our app customers purchase at least one fintech product when making a booking; and consumers are 1.6x more likely to repurchase if they add fintech to their booking vs if they booked just travel.

Given the success of its fintech products, Hopper launched a B2B initiative, HTS (Hopper Technology Solutions), which represents more than 75% of the business.

Through HTS, any travel provider (airlines, hotels, banks, travel agencies, etc.) can integrate and seamlessly distribute Hopper’s fintech or travel inventory on their direct channels. As its first HTS partnership, the company partnered with Capital One to co-develop Capital One Travel, a new travel portal designed specifically for cardholders. Other HTS partners include Air Canada, Uber, CommBank, Nubank, Flair Airlines and many more.

Hopper has been named the #1 most innovative company in travel by Fast Company Hopper has been downloaded over 120 million times and continues to have millions of new installs each month. Hopper is now the #3 largest online travel agencies in North America and 70% of our app customers are Gen-Z and millennials travelers.

Hopper has raised over $750 million USD of private capital and is backed by some of the largest institutional investors and banks in the world. HTS is primed to continue its growth as the leading travel ecommerce provider in a $1 trillion online shopping category. The Hopper app and website will also continue to be the preferred travel provider for Gen Z and Millennials..

Come take off with us!

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