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Perplexity AI is seeking a Senior Software Engineer to join its fraud prevention team. This role focuses on protecting the company's products, users, and infrastructure from fraud and abuse across the entire user lifecycle—from sign-up and authentication through payments, API usage, and product features.
You will own backend services end-to-end, from design through production operations. The team builds and operates a real-time decisioning platform that includes data pipelines for detection and model training, integrations with product and payment systems, and internal tooling for investigation and response. You'll work closely with fraud analysts, ML engineers, and product teams to make abuse expensive while keeping legitimate usage frictionless.
Key responsibilities include:
- 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
Requirements:
- 5+ years building and operating high-throughput, latency-sensitive backend systems in production
- Strong systems programming skills; Rust, Go, or C++ experience preferred (team writes 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
About Perplexity AI
AI / Data / Infrastructure — AI answer engine and search product for consumers and enterprises.
