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Joshua Hewitt
Senior Software Engineer specializing in Generative AI product development
San Francisco, USASenior Software Engineer9 years experienceSeniorSaaSEducation TechnologyArtificial Intelligence
ScreenedIdentity Verified
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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.
Experience
Senior Software EngineerPadlet
Software EngineerSpriggy
Software EngineerLeafcutter Creative Digital
Software EngineerOpus International Consultants
Education
The University of Sydneymaster, Professional Software Engineering (2018)
The University of Melbournebachelor, Civil Engineering (2015)
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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