Founding Engineer at Kastle (S24) at Kastle

Kastle is building AI operating system for consumer lending, starting with mortgage. We work with some of America’s largest mortgage lenders, helping them scale their contact center and compliance operations using AI voice agents. Backed by $2.3M from Y Combinator, Commerce Ventures, and executives from Snapdocs, Google, and WePay , we are redefining lending with AI. We’re looking for a Founding Engineer to build and optimize the Kastle platform. As an early team member, you’ll have a pivotal role in architecting and scaling our AI systems, ensuring high availability, low latency, and compliance with strict financial regulations. You’ll work closely with the founding team to design, develop, and deploy mission-critical AI applications that integrate with financial institutions. This role requires expertise in backend development and LLM Engineering —ideal for an engineer who thrives in high-impact environments. Architect and develop scalable backend services for AI-driven consumer lending applications. Design and implement APIs that integrate with loan servicing platforms, payment processors, and compliance systems. Optimize performance for real-time AI interactions, ensuring sub-7