Staff Engineer

About KastleKastle is building the AI employee for consumer lending. We work with some of America's largest banks and mortgage lenders, helping them scale their contact center and compliance operations using autonomous AI Agents that process payments, originate loans, and help customers get a world class experience during the biggest financial decisions of their lives. We've processed over $1 billion in transactions and are backed by Y Combinator and Commerce Ventures. If you are interested in building AI that is applied in the real world where precision, reliability, and performance matter and redefine access to credit across the world, apply below.What You’ll DoArchitect and own core systems that power real-time AI voice and compliance workflowsPush performance boundaries, delivering sub-700ms latency leveraging event driven architecture and parallel processingDeploy, operate, scale, 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 environments.What You BringStrong 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 environmentsNice to HaveExperience with training, designing, or building production AI/ML systemsPrevious startup or founder experience.The Interview ProcessWe respect your time. Our process is short and designed to let you showcase how you think:15-min call with Talent Lead to learn more about the role1-hour live coding session with Founding Engineer1-day onsite with teamWhy join KastleOpportunity to work with a world class team building a generational AI company that will redefine how every loan in America is made and managedAbility to move fast while your work impacting millions of customers. Add a new feature in a few days and ship it to top 10 lenders the next week.Competitive Compensation + Meaningful Equity at a high growth companyHigh ownership and direct input on product direction, company culture, and how the FDE function scales Other Perks and BenefitsFree gym membershipRobust medical, vision, & dental coverage401(K) plan offeringPaid Company MealsCompany offsites to get to know the team