Sr. Software Engineer, Core AI

Navan·New York, NY·Posted 12 November 2026

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About the Role We are building a fleet of specialized AI services that improve high-value human workflows across the company. As a Senior Software Engineer, Core AI, you will design, build, evaluate, and operate production-grade AI services and agents. You will own work end to end—from data and context design through tool use, application logic, evaluation, and production monitoring. What You’ll Do: Build specialized AI services: design and implement task-specific services and agents, including data serialization, retrieval, memory where appropriate, tool integrations, and bounded multi-step reasoning. Define and evaluate quality: work with partners to make expected behavior explicit, write and maintain evals against representative examples, and use results to measure performance against expectations. Improve quality systematically: use evaluation findings, failure analysis, and production feedback to improve context and data, service logic, tools, and model behavior. Build for production: integrate tracing, observability, versioning, monitoring, reliability practices, and success metrics into the services you own. Run controlled experiments: compare models, data, and…

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