Staff Full Stack Software Engineer, Fraud Risk Platform @ TripActions

Navan is seeking a Staff Full Stack Software Engineer to join our Fraud Strategy team and help build a scalable, extensible risk platform to mitigate fraud across our Travel business. This engineer will be embedded within the business unit and will partner directly with data scientists and fraud strategy leads to create robust, real-time fraud mitigation solutions that protect both Navan and its customers. You will lead the design and development of risk-centric services spanning onboarding, booking, and post-booking activities such as chargebacks and dispute management. Your work will power real-time decision engines, including third-party vendor integrations, feedback loops into machine learning models, and manual review tools that close the fraud detection and prevention lifecycle. This hands-on role requires strong technical depth, the ability to operate independently, and a collaborative mindset to translate business needs into high-reliability applications running at scale in the cloud. What You’ll Do: Architect and build extensible and scalable microservices to support real-time fraud detection and mitigation across the onboarding and booking flows for the travel customers. Work closely with Fraud Strategy Data Scientists to identify data needs, enabling real-time data ingestion and transformation of real-time and offline signals into the risk engine. Stand up and maintain a case management system to support manual decisioning and integrate outcomes back into model training pipelines. Develop integrations with third-party fraud vendors, ensuring their signals are correctly ingested and processed in the risk platform. Build observability dashboards to monitor performance, risk coverage, and system reliability. Own end-to-end CI/CD pipelines, including production deployment and best practices for release management. Ensure high reliability and performance in a cloud-native environment (AWS or similar). Serve as the engineering point person inside the business unit and help align risk mitigation engineering efforts with the broader product and engineering organization. Promote engineering excellence through code…

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