Senior Backend Engineer - Fraud Detection Squad

Join our cross-functional fraud detection squad where you'll build systems that protect millions of customers while keeping the good ones flowing seamlessly through our platform.

In this role you'll:

• Build fraud detection systems using microservices in Typescript (NestJS) and Ruby on Rails, running over Kubernetes to catch bad actors while keeping legitimate customers happy

• Leverage our autonomous tools to manage development flow—from environment setup to production deployment—so you spend time solving fraud, not fighting infrastructure

• Collaborate with data scientists, product managers, and fraud analysts in a self-sufficient squad to hit aggressive fraud prevention OKRs

• Own your domain's code quality, performance, and scalability as fraudsters get smarter and transaction volumes explode

• Design systems that make split-second decisions on claims and applications, balancing security with customer experience

• Coach and mentor other engineers while staying ahead of evolving fraud patterns and attack vectors

• Partner with our AI/ML teams to implement and optimize machine learning models that detect fraud in real-time

What you'll need:

• 6+ years as a backend engineer, ideally with experience in fraud detection, risk management, or high-stakes decision systems

• BSc in Computer Science, Mathematics, or equivalent experience

• Passionate about technology and the cat-and-mouse game of fraud prevention

• Broad knowledge of modern backend frameworks, tools, and architecture—especially real-time processing and decision engines

• Experience with high-scale, production-grade projects where uptime and accuracy are non-negotiable

• Past contributions to open source projects (bonus points for security or fraud-related work)

• Ability to work in an office environment a minimum of 3 days a week

• Enthusiasm about learning and adapting to the exciting world of AI—a commitment to exploring this field is a fundamental part of our culture