Question 1

Who is David YC Tseng?

Accepted Answer

David YC Tseng is a technical co-founder with 12 years of startup experience, based in Taipei. For the past 1.5 years he has built AI-first: agentic AI systems shipped to production — ReAct tool loops, multi-agent workflows, RAG, and eval — on OpenAI, Anthropic, and open-source LLMs. He co-founded Lootex (2018–2026), a cross-chain NFT marketplace that raised $9M seed, processed $10M+ in total trading volume, reached 140k+ wallets and 80k+ MAU, grew to 37 people at peak, and was featured as a Google Cloud case study for auto-scaling; earlier he co-founded UXTesting (Techstars '18), a remote user-testing SaaS with 30+ enterprise clients. Current builds: Taiwan-US Tax Agent, a compliance-grade RAG agent on AWS Bedrock AgentCore (taiwanustax.com); Modern Oracle (9qi.dev), a Chinese-language fortune-telling web app with client-side charting and paid readings; and Graph Engineering, an open-source (MIT) library of multi-agent prompt templates packaged as a Claude Code plugin. He hosts AI 新聞早知道, a daily Chinese-language AI news podcast (145+ episodes) produced end-to-end by an automated agent pipeline since July 2026, and writes the Chinese-language Product Lab newsletter (1,000+ subscribers, since July 2022). Anthropic certified — Claude Code in Action (2025); Stanford GSB LEAD executive program (2026–).

Question 2

Where is David based?

Accepted Answer

Taipei, Taiwan (Asia/Taipei).

Question 3

What is Graph Engineering?

Accepted Answer

Graph Engineering is an open-source (MIT) library of prompt templates by David YC Tseng for running AI agents as a graph instead of a queue: split work into isolated angles, fan out in parallel, merge deterministically, then send isolated skeptics to refute the result. Six templates in English and Traditional Chinese, each with a verbatim transcript of a real run, packaged as a Claude Code plugin. Repo: github.com/InjayTseng/graph-engineering-on-research.

Question 4

What did Lootex do?

Accepted Answer

Lootex was a gamer-centric, cross-chain NFT marketplace co-founded by David YC Tseng in 2018. It raised $9M seed funding, processed $10M+ in total trading volume, reached 140k+ wallets and 80k+ MAU, and ceased operations in March 2026. On-chain smart contracts remain functional.