About the role
Perplexity's fraud prevention team protects our products, users, and infrastructure from fraud and abuse across the whole lifecycle: sign-up, authentication, payments, API usage, and product features. We build and operate a real-time decisioning platform together with the surrounding systems: data pipelines for detection and model training, integrations with product and payment systems, and internal tooling for investigation and response. As a software engineer on the team, you will own services end to end, from design to production operations, and work closely with fraud analysts, ML engineers, and product teams to make abuse expensive and legitimate usage frictionless.
Responsibilities
- Design, build, and operate high-throughput, low-latency backend services for fraud detection and prevention
- Build data pipelines and real-time feature computation that power detections and ML models
- Collect and process trust signals
- Integrate fraud decisions into product, auth, and payment flows across Perplexity
- Own reliability of production services: observability, alerting, safe rollouts, incident response
- Build internal tooling for investigation, enforcement, and auditability
- Partner with fraud analysts to turn new abuse patterns into production detections quickly
Qualifications
- 5+ years building and operating high-throughput, latency-sensitive backend systems in production
- Strong systems programming skills; Rust, Go, or C++ experience preferred (we write Rust)
- Hands-on experience with Kubernetes, Terraform and cloud infrastructure
- Solid data fundamentals: stream/batch computations, caching and storage trade-offs
- Pragmatic, ownership-driven approach: ship incrementally, measure, and make failures degrade safely
Nice to have
- Fraud prevention, anti-abuse, or payments-risk domain experience
- Experience serving ML models in production
- Client-side experience (web or mobile) for signal collection
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Member of Technical Staff (Software Engineer, Fraud Prevention) employer: Perplexity
Perplexity is an exceptional employer that fosters a collaborative and innovative work culture, where your contributions directly impact the evolution of cutting-edge search technologies. With a hybrid work model in vibrant cities like Belgrade, London, or Berlin, employees enjoy flexibility alongside opportunities for professional growth and development in a dynamic environment. Join us to be part of a team that values creativity and excellence, while also providing competitive benefits and a supportive atmosphere for personal and career advancement.
