About me

Hi, I'm Yahoo Yuan — a full-stack developer open to remote work. I turn ideas into products that actually ship: marketing sites, full-stack apps, and modernized legacy sites.

Every case here is a fully clickable front-end demo — open a card under "Portfolio" to enter the showroom and page through each case exactly as a visitor would see it. Contact details sit in the profile card and on the Contact page.

What I can do

  • Full-Stack Web, End to End

    From business pain-point analysis and data modeling to full front/back-end delivery; clean code and complete handoff docs so teams or clients can take over at low cost.

    Next.js / React, TypeScript, Node.js, FastAPI / Python, Tailwind CSS, PostgreSQL

  • Versatile Deployment & Ops

    Rapid cloud launches, hardened overseas VPS (Fail2ban / iptables / Nginx), and bare-metal on-premise engineering — all three tiers, closing the code-only gap.

    Linux (Ubuntu/Debian), Nginx / SSL, Docker, UFW / Fail2ban, Automated Backups

  • Quant Trading & Execution Engines

    C++ / MQL5 bridging MetaTrader 5, CTA trend / grid / arbitrage strategy R&D with live risk controls, multi-symbol millisecond order routing and self-healing reconciliation.

    C++, MQL5 (MT5), Python, Redis, TimescaleDB

  • AI Enablement & Telecom Engineering

    Pragmatic enterprise AI (local RAG knowledge bases, Dify workflows, document agents); campus-scale surveillance networks and secure video-conferencing assurance.

    RAG, Dify / FastGPT, Ollama, CCTV / NVR, Telepresence

What I've done

Commercial Full-Stack Delivery & Multi-Tier Deployment

2025.01 — Present · Full-Stack Technical Consultant / Lead Engineer

  • End-to-end delivery of multilingual responsive websites and business dashboards; legacy monoliths modernized into headless architectures with 40%+ faster LCP and automated CI/CD.
  • Three-tier deployment: rapid cloud launches; hardened overseas VPS (Hetzner / DO) with Fail2ban, iptables rate-limiting and Nginx reverse proxy — server costs cut by 80%; bare-metal rack deployment capable.
  • Pragmatic AI enablement: local-LLM RAG knowledge bases and automated document classification pipelines, significantly improving cross-departmental turnaround.

Next.js, React, TypeScript, FastAPI, PostgreSQL, Docker, Nginx, Dify / Ollama

MT5 / C++ Algorithmic Trading Engine & CTA Strategies

2024 — Present · System Architect / Lead Developer

  • Low-latency execution: C++ / MQL5 bridging the MetaTrader 5 API with event-driven multi-symbol order routing, sub-millisecond order placement.
  • Dual-layer CTA verification: massive tick-data backtesting in Python (trend / grid / arbitrage), strictly deterministic live execution in C++ / MQL5.
  • Independent hard risk controls: fully decoupled risk daemon — hard stop-losses, daily drawdown circuit breakers, idempotent retries, cancel-on-disconnect.
  • Reconciliation & self-healing: Redis microsecond order-book mirroring, TimescaleDB history archiving, automated double-entry reconciliation.

C++, MQL5 (MT5), Python, TimescaleDB, Redis, ZeroMQ / WebSocket

Resume

Education

  1. PLA Rocket Force University of Engineering · Command Information Systems (B.Eng.)

    2012.09 — 2016.07

    Foundational coursework: computer networks, data structures & algorithms, operating systems, distributed system architecture, telecommunication principles.

Experience

  1. Full-Stack Engineer / Technical Consultant · Freelance

    2025.01 — Present
    • End-to-end full-stack web delivery, versatile server operations (Cloud / hardened VPS / bare-metal), MT5 / C++ quantitative systems, and enterprise AI enablement.
    • Strict engineering discipline: clean daily Git commits, transparent code delivery, complete handover docs — delivering not just code but a stable, secure production environment.

  2. Communications & Systems Infrastructure Officer · (Declassified)

    2016.07 — 2025.01
    • Large-scale information systems engineering: modular requirements analysis, core logic development and cross-platform adaptation for command & dispatch systems.
    • Field deployment & joint commissioning: directed hardware/software integration and full-chain rollout, formulated deployment SOPs, resolving legacy protocol and compatibility hurdles.
    • Campus-scale smart surveillance: HD IPC selection, topology design, VLAN segmentation, NVR storage arrays and low-latency video streaming.
    • Secure telepresence & conferencing: multi-point video command systems and digital audio, hundreds of critical missions with zero delay, zero stutter, zero failure.
    • Datacenter operations: core server rooms, structured cabling and network maintenance — 8.5 consecutive years with zero major security incidents.

Contact

Want to talk? Any of the ways below works — I usually reply within 24 hours on weekdays.

Working Principles

Collaboration: full-time role, long-term remote contracting (20–40 hours/week), or milestone-based project delivery.

Professional integrity: clean daily Git commits, transparent milestone updates, NDA adherence — reliable and never out of touch.