Kiho Nguyen

Full-stack & Blockchain Engineer

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KihoNguyen

Full-stack & Blockchain Engineer · aka Yugo

Payment infrastructure and on-chain systems — from smart contracts to production gateways.

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#01024TypeScript0xd90c17db
#01025Rust0xdf0c214d
#01026MVMove0xc00bf080
#01027Solidity0xde0c1fba
#01028NestJS0xc30bf539
#01029GraphQL0xca0c003e
#01030Next.js0xc30bf539
#01031React0xdf0c214d
#01032PostgreSQL0xdd0c1e27
#01033FastAPI0xcb0c01d1
#01034Stellar0xde0c1fba
#01035Aptos0xcc0c0364
1036 blocks · finalized
01 / Selected work

On-chain,inproduction

Stellar · Fintech

UCTalent Payment Rails

Dual-rail payouts for a live hiring platform: 9Pay checkout at home, USDC payroll across borders via Soroban and SEP-31.

  • Idempotent intents, signed webhooks
  • Milestone escrow, atomic split
  • VND settlement < 10s
  • NestJS
  • GraphQL
  • PostgreSQL
  • Soroban
  • SEP-31
sim://payment-railslive
Domestic · VNDClientcheckoutIntentidempotent9PaygatewayWebhookHMAC ✓e-InvoiceissuedCross-border · USDCEmployerUSDCSorobanescrowMilestonereleaseSEP-31anchorVND Bank< 10sshared ledger · reconciliation
  • FIATea0c32intent.created pi_4f2a · 12,500,000 VND
  • CHAINe60c2cescrow.lock 1,200 USDC · 3 milestones
  • FIAT3a0cb09pay.ipn signature verified
  • CHAINee0c38milestone#2 released → split 95 / 5
  • FIATea0c32invoice.issued WinInvoice #00172
  • CHAINf00c3csep31.payout settled 8.4s · 30.49M VND

Aptos · EVM

Oreka

Binary prediction market built natively on Aptos Move and Solidity.

  • Resource-oriented markets
  • Pyth pull vs Chainlink push
  • Long/short pool settlement
  • Move
  • Solidity
  • Pyth
  • Chainlink
  • React
sim://orekalive
MarketBTC ≥ 68,000
Mark67752.5
OraclePyth · pull
40
15%P(long)
LONG 1.83×2.20× SHORT
TVL 33,730 USDC
    Pyth update verified on-chainSHORT pool settles · 2.20× payout

    Aptos · Move

    Futarchy Protocol

    Governance by markets: each proposal opens PASS and FAIL markets; the higher TWAP wins.

    • 1 USDC → 4 outcome tokens
    • Gaussian AMM, dynamic fees
    • AI oracle, optimistic disputes
    • Aptos Move
    • Gaussian AMM
    • TWAP
    • Oracle adapter
    sim://futarchylive
    1 USDC
    PASS·YESPASS·NOFAIL·YESFAIL·NO
    PASS TWAP 0.500FAIL TWAP 0.500 · +3% premium
    MintTradeTWAP checkDIVE · 24h window
    FAIL · proposal rejected
    02 / Case study

    Trust,enforcedbycode

    Base · AI · Security

    Bloody-Roar

    Trust-minimised bounty marketplace. Verifiable identity, contract-held rewards, and AI that assists — never replaces — human judgement.

    • Next.js 14
    • GraphQL Yoga
    • Prisma
    • PostgreSQL
    • Solidity 0.8.24
    • Base Sepolia
    • LLM router
    Layer 01 / 05

    Wallet-native identity

    SIWE replaces passwords. A verified GitHub profile is the developer's collateral.

    • EIP-4361
    • GitHub verified
    • Zero stake

    bloody-roar.app wants you to sign in with

    your Ethereum account: 0xe00c…f30c

    URI: https://bloody-roar.app

    Chain ID: 84532 · Base Sepolia

    Nonce: fb0c4d61235eaf3d

    sig 0xd60c13229f02f49e8ca678e1940f2a1e…

    ✓ recovered signer matches · session issued · GitHub linked

    Simulation · sample data

    Rules-first redactionHash-only logsHuman-led arbitrationSigned sessions
    03 / About

    Calmcode.Relentlessdelivery.

    Emblem · hex lattice

    Where money meets code. Correctness first — idempotent APIs, auditable state, contracts that fail safe.

    01

    Smart Contracts

    Escrow, markets and governance on Soroban, Move and EVM.

    • Soroban
    • Move
    • Solidity
    • Oracles
    02

    Payment Infrastructure

    Payment intents, gateways, webhooks and e-invoicing in production.

    • NestJS
    • GraphQL
    • PostgreSQL
    • 9Pay
    03

    Product Engineering

    Type-safe interfaces, realtime features, AI workflows.

    • Next.js
    • React
    • FastAPI
    • LLM
    04 / Stack

    Toolkit

    Stack
    01

    Chains

    • Stellar
    • Aptos
    • Solana
    • Ethereum
    • Base
    02

    Smart contracts & Web3

    • Solidity
    • MV Move
    • Rust
    • SB Soroban
    • HH Hardhat
    • FD Foundry
    • OpenZeppelin
    • Ethers
    • Viem / Wagmi
    • Chainlink
    • PY Pyth
    03

    Backend & data

    • NestJS
    • Node.js
    • Express
    • GraphQL
    • TypeORM
    • Prisma
    • PostgreSQL
    • MySQL
    • SQ SQL Server
    • Redis
    • BQ Bull
    • Socket.io
    • FastAPI
    • SQLAlchemy
    04

    Frontend

    • TypeScript
    • Next.js
    • React
    • Vite
    • Tailwind
    • shadcn/ui
    • Redux
    • TanStack Query
    • Zod
    • Framer Motion
    • Three.js
    • GSAP
    • Electron
    05

    AI & speech

    • Gemini
    • AI OpenAI
    • GQ Groq
    • WH Whisper
    • DG Deepgram
    • AZ Azure Speech
    06

    Cloud & quality

    • Docker
    • Google Cloud
    • S3 AWS S3
    • Firebase
    • Supabase
    • Vercel
    • Vitest
    • Jest
    • PW Playwright
    • Pytest
    07

    Mobile & systems

    • Android
    • C++
    • Python
    05 / Experience

    Thechainsofar

    Block #0040xda0c196e4d
    2026 — Present

    Software Engineer — UCTalent

    Payments & invoicing backend. Stellar payouts. UC Yield on Base.

    Block #0030xc60bf9f243
    2025 — 2026

    Blockchain Engineer — Independent · Aptos & EVM

    Oreka prediction market. Futarchy protocol on Aptos.

    Block #0020xcd0c04f745
    2025 — 2026

    Capstone Lead Developer — Bloody-Roar

    Escrow, wallet identity, AI guard and arbitration.

    Block #0010xcb0c01d1e8
    Education

    Information Systems — Duy Tan University · CMU Program

    Systems integration, databases, mobile.

    Let'sbuildwhatsettles.

    trongkhoidev@gmail.com
    LinkedIn ↗GitHub ↗X @trongkhidev ↗