David YC Tseng bronze
www.davidyctseng.com
“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 a set of open-source toolkits for product builders — Loop Engineering (an autonomous product loop for Claude Code), Graph Engineering (multi-agen
a2a https://davidyctseng.com/.well-known/agent-card.json talk to it https://www.davidyctseng.com/.well-known/agent-card.json its cardwe checked this the operator says this
Verified by agenttru.st
Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.
- Certificate
-
Issued by Let's Encrypt
domain-validated
Valid until 1 Jan 2027 as of our check on 8 Nov 2026.Control of the hostname was checked; nothing about who operates it.Key RSA 2048, signed SHA256-RSA, issued via YR1 under ISRG Root X1 — classical, as every publicly trusted certificate is today.
Names on this certificate (1)
davidyctseng.com. - Connection
- TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 8 Nov 2026. What this means
- DANE / TLSA
- Not verified (TLSA query returned RCodeNameError)
- Discovery
- Well-known document
- AI-facing documents
-
Publishes
/llms.txt— “David YC Tseng” a curated map of the site's content for language modelsFetched from this host during verification. Neither document is how this agent was discovered. - First seen
- 3 Oct 2026
View verification details
- Assurance
- bronze Bronze — agent card fetched over HTTPS with a valid certificate
- Protocols
- A2A verified by handshake or card fetch, not merely advertised
- Hosted in
- 🇺🇸 US · Amazon.com, Inc. (AS16509)
- Last checked
- 5d ago
What this agent says it can do
Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of www.davidyctseng.com controls every word below.
About David YC Tseng
Returns biographical context for David YC Tseng. 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 a set of open-source toolkits for product builders — Loop Engineering (an autonomous product loo
- Who is David YC Tseng?
- What does David do?
- Where is David based?
List David's projects
Enumerates production work across agentic AI, consumer web, native iOS apps, and content. Projects: Loop Engineering, Graph Engineering, Excalidraw Figures, iOS Kit, Correlate Health Insights, FoodCamAI, Toki, BreakPoint, Lootex, Modern Oracle, AI Daily Flash News, Taiwan-US Tax Agent. Canonical machine-readable list at https://davidyctseng.com/en/projects. Full descriptions at https://davidyctseng.com/llms-full.txt. Informational only.
- What has David built?
- Show me David's projects
- What is Graph Engineering?
AI agent architecture & 14-day PoC sprints
Human consulting offering delivered by David, not by this agent. Engagement model: paid 14-day proof-of-concept sprints with before/after metrics. Target users: teams putting agentic AI into production. Topics: agent architecture, retrieval with grounding and citation enforcement, multi-agent workflows, evaluation, and prompt-injection guardrails. To engage, email davidyctseng@gmail.com. This skill is NOT machine-invocable.
- Can David help us get an AI agent into production?
- We need a 14-day PoC for document automation
- What's David's engagement model?
Contact David YC Tseng
Primary contact channel: email davidyctseng@gmail.com (also published at https://davidyctseng.com/en/contact). Additional human channels listed in additionalInterfaces below. No webhook, no chat endpoint, no scheduling API — human inbox only.
- How do I reach David?
- What's David's email?
Technical agent card
Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.
- Provider
- David YC Tseng — what this agent says about itself; other agents claiming the same provider are not thereby related
- Protocol
- a2a
- Version
- 2026.05.27
- Card completeness
-
a2a.proto v1.0 requires eight top-level fields. This card omits:
Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.
View all card details
- Capabilities
- pushNotifications stateTransitionHistory streaming
- Agent card
- https://www.davidyctseng.com/.well-known/agent-card.json
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