I'm Charles,a Technical Partner for Startups

Revision History is a Chrome extension that shows teachers how a student's work was actually written — replaying the document from first keystroke to final draft, rather than guessing at AI use with a detection score. Used by 200,000+ teachers.

On a 3-person team, built two products from zero: slide replay for Google Slides and Byline, which lets students use AI openly while giving teachers visibility into the process. Designed the architecture, reverse-engineered undocumented data structures, and built the pipelines behind both.

Greeni helps companies measure and report their environmental impact.

Worked with the team to turn ESG domain knowledge and product needs into product logic and technical structure. Rebuilt the frontend around reusable patterns and a clearer architecture, so a small team could ship and validate changes quickly instead of fighting the codebase.

Voy lets travelers book trips by talking to an AI agent instead of filling out search forms.

Built the mobile app end to end — conversational UI, backend, and agent integrations — on a React Native and Next.js monorepo with a custom design system.

A leading vegetable trading company in Europe manually processed daily price lists from suppliers in various formats (PDFs, emails, images), resulting in inefficiencies and high operational costs.

I independently designed the architecture and built an OCR-powered system to automate parsing, processing, and structuring data for direct business use, eliminating manual entry inefficiencies.

Hokkaido Track, a luxury ski resort in Japan, required a contactless solution to uphold its high-end service quality as guests avoided direct interaction during the pandemic.

I transformed hotel operation manuals into automated digital workflows, streamlining guest requests and staff coordination. I designed the entire system architecture, UX and UI, and built an interactive Figma prototype for guest and operator apps.

Taiwan-New Beef Noodle, a 40+ year-old brand in Taiwan had to pivot during the pandemic lockdown as in-person dining was no longer possible.

I set up an e-commerce platform to sell ready-to-cook products, enabling online orders with seamless inventory, logistics, and payment integration. This allowed the restaurant to continue operations and reach new customers.