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Joseph Villanueva - Software Engineer in San Francisco, CA

Joseph Villanueva

Senior Software Engineer specializing in full-stack SaaS and Healthcare IT

GustoSanta Clara UniversitySan Francisco, CA8 Years ExperienceSenior LevelWorks On-Site

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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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Experience

Software EngineerGusto · Jul 2024 – Feb 2026
Software EngineerNarrable · Aug 2023 – Apr 2024
Software EngineerLob · Nov 2019 – Jan 2023
Software EngineerCerner · Feb 2017 – Oct 2019

Education

Santa Clara Universitybachelor, Computer Science & Engineering (2016)

Languages

English

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Typically responds within 24 hours

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Joseph VillanuevaSenior Software Engineer specializing in full-stack SaaS and Healthcare IT