Zhang Kuo
A full-stack engineer, discovering some interesting things.
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Overview
GitHub contributions
About
- I’m Zhang Kuo (张阔), a full-stack engineer with 10 years in financial payments, from front-end scanning, acquiring and gateway authentication to back-end settlement and cross-border payments.
- Previously a Senior Technical Expert (T10) at Tencent, where I led the rebuild of the cross-border settlement system, after years at China CITIC Bank and China Merchants Bank.
- Now building independent products such as Postion, KukoPay, SupaStock and BuouUI, with a focus on AI, Web3 and UI.
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Stack
Language
Frontend
Backend & Database
Experience
- Build and run a portfolio of independent products: Postion, KukoPay, SupaStock, SupaStore and BuouUI.
- Own every layer end to end, from product design and frontend to payments, data pipelines and operations.
- Ship AI features on top of OpenAI and Gemini APIs, including multilingual content generation and quantitative research tools.
- Next.js
- TypeScript
- Python
- FastAPI
- Stripe
- OpenAI
- Tailwind CSS
- Vercel
Financial Technology Division.
- Led the architectural rebuild of the cross-border settlement system using Domain-Driven Design.
- Managed a 25-person team spanning backend, frontend, QA and operations.
- Cut batch settlement processing from 4 hours to 30 minutes with Spark distributed computing.
- Java
- Spring Cloud
- DDD
- Spark
- Cross-border Payments
- Kubernetes
- Team Leadership
- Java
- Spring Boot
- Gateway
- High Concurrency
- Redis
- Project Management
Education
Projects(8)
Payment infrastructure for global businesses: one API from order creation to fund settlement.
- Unified HTTP + JSON API for orders, refunds and payouts
- Hosted checkout, so merchants never handle card data
- HMAC-SHA256 signed webhooks and automatic reconciliation
- Wallet and ledger tracking for every fund movement
- Payments
- Cross-border
- API Design
- Webhooks
- Security