About KastleKastle is building the AI operating system for consumer lending. We partner with some of America's largest mortgage lenders to transform their contact centers and compliance operations with AI voice agents. Backed by Y Combinator, Commerce Ventures, and executives from Snapdocs, Google, and WePay, we're redefining how millions of borrowers interact with financial institutions and how lenders operate at scale. This is a rare chance to join at the ground floor of a company already plugged into large‑scale customers and real production use cases.What You'll DoArchitect and own core systems that power real‑time AI voice and compliance workflowsPush performance boundaries, delivering sub‑700 ms latency leveraging event‑driven architecture and parallel processingDeploy, operate, scale, and maintain resilient systems using Kubernetes and distributed sub‑systemsBuild a self‑improving AI system that improves with every customer interaction and human feedbackShip fast, ship right from whiteboard design to live production in bank environmentsWhy Join Kastle?Build what banks run on: Your code won't sit in a sandbox, it'll power real borrower interactions at scaleAct like a founder: High ownership, autonomy, and input on product, tech, and cultureLearn fast: Daily exposure to customers and their feedback loopsStrong upside: Competitive salary, meaningful early‑stage equity, and a front‑row seat to building a category‑defining companyGreat team: Work side‑by‑side with a world‑class founding team from Verkada, NVIDIA, Apple, and RedfinWhat You BringStrong fundamentals in building high‑performance, real‑time backend systems (we work primarily in Python)Deep understanding of distributed systems, reliability, and fault toleranceExcellent database design and performance optimization skillsA bias for ownership and an ability to figure things out in messy, high‑velocity environmentsNice to HaveExperience with training, designing, or building production AI/ML systemsPrevious startup or founder experienceThe Interview Process15‑min call with CEO1‑hour live coding session with CTO1‑day onsite with teamCompensation Range: $130K - $200K#J-18808-Ljbffr