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Staff Engineer

Kastle· Engineering
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San Francisco$250k - $320kFull-timePosted 1mo ago

About the role

Staff Engineer role at Kastle, an AI employee for banks, focusing on real-time AI voice and compliance workflows, high-performance backend systems, and scalable, fault-tolerant architecture.

Responsibilities

  • Architect and own core systems that power real-time AI voice and compliance workflows
  • Push performance boundaries, delivering sub-700ms latency leveraging event driven architecture and parallel processing
  • Deploy, operate, scale, resilient systems using Kubernetes and distributed sub-systems
  • Build a self-improving AI system that improves with every customer interaction and human feedback
  • Ship fast, ship right from whiteboard design to live production in bank environments.

Qualifications

  • Strong fundamentals in building high-performance, real-time backend systems (we work primarily in Python).
  • Deep understanding of distributed systems, reliability, and fault tolerance.
  • Excellent database design and performance optimization skills.
  • A bias for ownership and an ability to figure things out in messy, high-velocity environments

Skills

Required:PythonDistributed SystemsDatabase Design & OptimizationSystem ArchitectureOwnership & Navigation in High-Velocity Environments

Benefits

  • Free gym membership
  • Robust medical, vision, & dental coverage
  • 401(K) plan offering
  • Paid Company Meals
  • Company offsites to get to know the team
Last updated Oct 21, 2026. Interested? Apply on the company site.
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About Kastle

AI agents for mortgage servicing

Kastle is an AI voice agent for mortgage servicing. We help servicers collect payments, verify new borrowers, and qualify new loan inquiries over the phone. Rishi and Nitish met at UIUC where they graduated with degrees in systems engineering and computer science. Rishi was the founding Product Manager for Redfin’s Mortgage Marketplace at 22 and grew the business from $3M to $6M in revenue in 9 months. Nitish patented Verkada’s motion search system and was the youngest tech lead at the company at 23. While building Redfin's Mortgage Marketplace Rishi realized traditional lenders didn't have the infrastructure to service online inquiries and were losing customers. Nitish and Rishi are building Kastle to help traditional financial services companies better interface with their customers.

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