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Joseph Villanueva
Senior Software Engineer specializing in full-stack SaaS and Healthcare IT
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About
Product-minded software engineer from Gusto who has shipped internal AI agent capabilities and end-to-end user-facing features across frontend and backend. Stands out for making pragmatic architecture tradeoffs—moving from OpenAI prototypes to deterministic systems when accuracy, latency, and uptime mattered—while still improving LLM workflow quality and reducing tool-calling errors by 15%.
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Key Strengths
- Shipped production AI workflow tools inside Gusto
- Strong AI reliability mindset with monitoring and graceful fallbacks
- Improved LLM tool-calling quality with prompt and schema refinements
- Reduced tool-calling errors by 15%
- Owned end-to-end web UI and backend feature delivery
- Balanced AI ambition with deterministic architecture for accuracy and latency
- Built sub-100ms autocomplete experience for critical workflow
- Drove zero-to-one product scoping and iteration with Product and Design
- Data-informed iteration using qualitative usage patterns and user corrections
- Focus on scalable, composable workflow design
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