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Joshua Hewitt
Senior Software Engineer specializing in Generative AI product development
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About
AI product builder at Padlet who shipped multiple production LLM features for education workflows, including an AI document generator (AI Recipes) and a RAG-enabled in-product chat assistant. Built an AI microservice layer (LangChain) to swap model providers easily and created automated + human-in-the-loop evaluation systems (including ~100-test runs) to iterate on prompts and quality.
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Key Strengths
- Built and shipped LLM product (AI Recipes) to production for educators
- Deep prompt engineering to improve low-quality LLM outputs at model limits
- Designed human feedback/approval rating system to diagnose prompt changes
- Created rapid batch evaluation workflow for subjective UI-dependent quality
- Implemented LangChain-based microservice enabling quick model-provider switching
- Built automated test suite (~100 tests/run) to compare models/prompts
- Delivered RAG chat assistant using OpenAI Assistants API
- Solved multilingual text-to-image quality issues via prompt translation; collaborated with non-technical stakeholder
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