Member of Technical Staff

Kastle is the AI operating system for consumer lending, starting with mortgage. They build AI voice and SMS agents that mortgage lenders deploy across contact centers, collections, and compliance operations. The product handles payment collection, escrow questions, new loan qualification, and delinquent-borrower engagement, automating call and text workflows that historically required teams of humans working long hours.

Kastle scores each AI call against the lender's own quality framework to guarantee regulatory compliance (FDCPA, RESPA, TILA). Traction: - Over $1 billion in payments processed to date - ~$6M+ in revenue generated in 2026 - Growing from 10 people to 30 by end of 2026 Backed by Y Combinator (S24 batch), Commerce Ventures, and executives from Snapdocs, Google, and WePay. Why this matters: mortgage servicers are structurally short-staffed on inbound call volume that spikes with delinquency cycles.

Borrowers wait in queues to make payments. Compliance is unforgiving. Kastle's bet is that AI voice. SMS agents, with airtight regulatory grounding, can cut cost-to-service by 80% while giving borrowers 24/7 access and giving lenders auditable, always-compliant interactions.

Kastle is hiring Members of Technical Staff, internally referred to as founding engineers. The mandate is to architect and own the core systems that power Kastle's real-time AI voice and compliance workflows for top-10 US mortgage lenders. Someone who's a little bit more infra / backend. The archetype is the engineer who comes in, has an opinion on how the product should actually be built, and starts rebuilding it.