Founding Engineer jobs in United States
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Kastle (YC S24) · 21 hours ago

Founding Engineer

positionSan Francisco, CA
timeFull-time
remoteOnsite
seniorityMid, Senior Level
money$130K/yr - $200K/yr

Kastle is an innovative company building the AI operating system for consumer lending, partnering with major mortgage lenders to enhance their operations with AI voice agents. The Founding Engineer will architect and own core systems for real-time AI workflows, ensuring high performance and resilience in production environments.

Artificial Intelligence (AI)Financial ServicesMortgageReal EstateSaaS
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H1B Sponsor Likelynote

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

Qualification

PythonDistributed systemsDatabase designPerformance optimizationAI/ML systemsStartup experienceOwnership

Required

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

Preferred

Experience with training, designing, or building production AI/ML systems
Previous startup or founder experience

Benefits

Meaningful early-stage equity

Company

Kastle (YC S24)

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Kastle is a workflow automation tool for mortgage lenders and servicers.
dateFounded in 2024
location
San Francisco, California, USA
people-size11-50 employees
web-link
https://www.kastle.ai

H1B Sponsorship

Kastle (YC S24) has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)

Funding

Current Stage
Early Stage
Total Funding
$0.5M
Key Investors
Y Combinator
2024-06-01Pre Seed· $0.5M
Company data provided by crunchbase