phuochau2403
Blockchain & Ai Agent Engineer — Agent Payments Infrastructure
I build autonomous agents that hold and move real money on-chain — and the payment rails underneath them. Solo builder: contracts, backends, frontends, and the 24/7 infrastructure that keeps them running.
Focus: agent-to-agent payments, USDC settlement, machine-to-machine commerce (x402/HTTP 402), and MPC wallet automation with no private keys on disk.
Recent work
• Arc Pump — a pay-per-call payment rail on Arc (Circle's L1): agents pay per HTTP request in USDC, metered and capped, verified on-chain. Live and clickable: arcpump.com/pay.
Finalist, Encode x Remix AI Bootcamp 2026.
• RateCard — a paid agent that prices other agents, live on the CROO Agent Store, settling in USDC on Base.
• CLAUDE x QUANT — a live decision terminal for a trading agent: circuit breakers, Kelly sizing capped at 2% of equity, Wilson confidence intervals instead of point estimates.
How I work
Everything runs live on infrastructure I manage myself, and I report results honestly.
When my trading agent showed +22.3% ROI over 72 trades, I published that as NOT evidence of edge — the Wilson lower bound sat below the break-even threshold and five trades carried 180% of P&L. Then I found the cause: the entry gate priced edge against a last-trade reference that sat outside the tradeable bid-ask spread 47% of the time, measured across 545 quote snapshots.
Background
Nine years as a technical engineer with a Japanese precision-engineering manufacturer, including 3.5 years on assignment in Japan, before teaching myself blockchain and AI engineering. Physics degree taught in English.
Looking for remote engineering roles in agent payments, stablecoin infrastructure, or wallet and signing infra. Vietnam (UTC+7) — 2 hours from Tokyo, and I work in Japanese.
Focus: agent-to-agent payments, USDC settlement, machine-to-machine commerce (x402/HTTP 402), and MPC wallet automation with no private keys on disk.
Recent work
• Arc Pump — a pay-per-call payment rail on Arc (Circle's L1): agents pay per HTTP request in USDC, metered and capped, verified on-chain. Live and clickable: arcpump.com/pay.
Finalist, Encode x Remix AI Bootcamp 2026.
• RateCard — a paid agent that prices other agents, live on the CROO Agent Store, settling in USDC on Base.
• CLAUDE x QUANT — a live decision terminal for a trading agent: circuit breakers, Kelly sizing capped at 2% of equity, Wilson confidence intervals instead of point estimates.
How I work
Everything runs live on infrastructure I manage myself, and I report results honestly.
When my trading agent showed +22.3% ROI over 72 trades, I published that as NOT evidence of edge — the Wilson lower bound sat below the break-even threshold and five trades carried 180% of P&L. Then I found the cause: the entry gate priced edge against a last-trade reference that sat outside the tradeable bid-ask spread 47% of the time, measured across 545 quote snapshots.
Background
Nine years as a technical engineer with a Japanese precision-engineering manufacturer, including 3.5 years on assignment in Japan, before teaching myself blockchain and AI engineering. Physics degree taught in English.
Looking for remote engineering roles in agent payments, stablecoin infrastructure, or wallet and signing infra. Vietnam (UTC+7) — 2 hours from Tokyo, and I work in Japanese.
Experience: 1 year
Yearly salary: $70,000
Hourly rate: $40
Nationality: 🇻🇳 Vietnam
Residency: 🇻🇳 Vietnam
Experience
Technical Engineer
Flint Co., Ltd. (株式会社フリント) — Huế, Vietnam · present 2022 - 2026
Current role. Returned to the Vietnamese site for family reasons and have continued in an engineering role since: mechanical design and CAD for precision components, and production process engineering to the same Japanese standards. Nine years of micrometre-tolerance engineering is the same discipline I now apply to payment systems — specify precisely, verify rather than assume, and design for the failure case first. In parallel, self-taught blockchain and AI engineering: five production agents deployed across four chains and agent marketplaces, each running 24/7 on infrastructure I manage myself. Finalist at the Encode x Remix AI Bootcamp for Real World Impact (2026).
Design Engineer — Japan Assignment (Fukuoka)
Flint Co., Ltd. (株式会社フリント) — Fukuoka, Japan 2017 - 2021
Joined Flint's Vietnamese site in 2017 and was selected after one year for a five-year training programme at the parent plant in Fukuoka, Japan — one of a small number of engineers chosen from the Vietnamese site. Completed three and a half years embedded in the Japanese organisation, working in Japanese. Mechanical design and technical drawing (CAD) for precision press dies and metal stamped components — motor core dies and ultra-thin laminated assemblies held to micrometre tolerances — to Japanese tolerance and documentation standards, where a specification is exact and "roughly right" fails inspection. Production process engineering on the line, and the continuous-improvement discipline that goes with it.
Skills
api
defi
founding-engineer
git
linux
nextjs
node
python
react
smart-contract
typescript
web3js
solidity
english
japanese
vietnamese