I'm Qi Yan Jin
Full-Stack Developer\n& DevOps Engineer
I design and build complete digital products — backend architecture, API design, frontend interaction, and deployment. Break complex problems down, solve them with simple, reliable solutions.
$ whoami
front + back + server, one person
$ uptime
13 years in production
$ ls ./now
Cross-border / Short Video / AI
- Years Experience
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- Projects
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- Tech Stack
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- Posts
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In Progress
What I am working on right now
AI Research & Application
Not watching news and running demos — actually putting AI into business workflows. Researching model deployment, GEO and AI search visibility, multi-model cost control, document and image understanding, AI-assisted development. Judgment still matters more than tooling.
LLM API · SiliconFlow · FastAPI · Vision Models · RAG 02Cross-Border E-commerce & Short Video Research
My main focus right now. Researching cross-border product selection, industrialized short-video production, and the conversion loop between storefronts and social channels — turning the repetitive parts into tools.
Python · Data Analysis · Automation · Short Video Tools 03Multi-Site Automated Ops Script Suite
Scripted deployment, certificate renewal, log cleanup and health checks across multiple servers, cutting down manual mistakes.
Shell · Python · Nginx · SSL 04AI Merchant Assistant Platform
An AI automation service for small and medium merchants: a conversational front end plus a lightweight knowledge base that answers repetitive questions and handles daily inquiries.
FastAPI · Vue 3 · Docker · LLM APICompleted
- 01 Municipal Engineering Project Management System PHP · MySQL · RBAC · Reporting
- 02 Cross-Border DTC E-commerce System PHP · MySQL · Redis · Nginx · Payment Integration · Logistics API
- 03 Personal Writing Management System Node.js · Express · Apache · Nginx
- 04 Quantitative Trading Data System Python · FastAPI · AKShare · Pandas
- 05 Full-Stack Tools Site & Mini-Program Membership PHP · MySQL · Nginx · WeChat Mini Program · ThinkPHP
- 06 GEO Intelligent Optimization Platform Vue 3 · Vite · FastAPI · PostgreSQL · Redis · Docker
Latest Posts
Learning an instrument as an adult is not what I imagined
Making up for something I never learned as a child. The biggest obstacle is not stiff fingers — it is being unable to stand how badly you play.
Read → 2026.10.28Calligraphy: several years before I dared say I had a foothold
Practising writing is strange — it looks fine while you write it, and the next day every flaw is obvious. The feedback loop is far longer than with code, and far more interesting.
Read → 2026.10.28Reading: not for anything, just reading
I have read for many years, moving from "every book must be useful" to "finishing it is enough". The shift took a while, and was worth it.
Read → 2026.10.28I may have misunderstood what "persistence" means
I used to think persistence was willpower, gritting your teeth and pushing through. Years later I found that the things I actually stuck with never required persistence at all.
Read → 2026.10.28Running a cross-border store alone — technology is the easy part
Technical problems can all be solved with documentation. Product selection, logistics, payments, after-sales — the non-technical problems are what actually stop people. A few honest notes after a year of it.
Read →Get In Touch
Have a project in mind, or just want to talk tech? Reach out.
