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Open to opportunities · Remote · Global

Hi, I'm Andrew Liu. I build AI Agents that ship to production.

5+ years building backend, AI Agent, and Web3 systems. From RAG and LangChain to Solana payments and TGE security — I ship the unglamorous infrastructure that makes AI products actually work.

View work → Get in touch GitHub
5+years shipping
$5M+GMV supported
40%faster delivery
23×perf gain
01About

Backend craft, AI obsession, full‑stack reach.

I'm an AI & backend engineer with a soft spot for the parts other people skip — deployment pipelines, retrieval correctness, payment edge cases, compliance bugs hiding in time-zone math. I think production is the only honest review of an idea.

// Currently shipping

CUDIS — AI Agent & Web3 R&D Engineer (Remote · LA, US) Owning AI Agent infra from zero to one: RAG knowledge base, dual-layer memory, AI Coach & AI Plan health system, Web2 + Web3 payments, and TGE security hardening. Built infra that supported $5M+ in smart-ring sales and cut team AI delivery time by 40%.
LangChainRAGSolanaSUI StripePythonShopifyPrompt Eng

// At a glance

Based in
Beijing, China
Languages
English (IELTS 7), Mandarin (native), Japanese (N5)
Availability
Open to remote & relocation
02Skills

The full stack, with depth where it matters.

Tools are means, not identity. I pick what the problem actually needs — and read the source when the docs run out.

AI / LLMagentic systems
LangChainRAGAI Agent Prompt EngineeringEliza Short/Long-term Memory NLPFace Recognition
Blockchain / Web3solana · sui
Solana RPCSUI Smart Contract Calls Cross-chain Verification SwapTGE
Paymentsweb2 + web3
StripeWebhook Dynamic Pricing Jupiter SwapAlchemy Pay Bonding Curve
Backendpolyglot · high-concurrency
GolangPythonRust GinEchoBeego GormgRPCRESTful WebSocket
Data & Storageoltp · cache · search
MySQLPostgreSQLMongoDB RedisElasticsearch KafkaFlume HadoopHDFS
Infra & DevOpscloud-native
DockerKubernetes PrometheusGrafana NginxAWS S3 / EC2 CI/CDLinux/Systemd AntsEtcdCasbin
03Experience

Five years of shipping, three companies, one internship, one habit: production-first.

CUDIS
R&D Engineer · AI Agent / Web3 / Full-Stack
2024.05 – 2026.05 LA, US · Remote
LangChainRAGEliza SolanaSUIStripe PythonShopify
  • AI Agent infrastructure from 0→1. Stood up CUDIS' AI Agent service from scratch, built Python production auto-deploy pipelines, cut team AI delivery time 40%. Drove the AI tech transition, evaluated LangChain / Eliza and shipped to production.
  • RAG knowledge base + dual-layer memory. Designed the full RAG pipeline (ingest → vectorize → retrieve → generate) with live knowledge updates; dual-layer memory (short-term conversation + long-term user profile/history) drives personalized recommendations. Unified AI API surface — business onboarding cost ↓ 60%+.
  • AI Coach & AI Plan health recommendation. Led end-to-end rewrite of AI Coach; built AI Plan integrating Metrics, Vitality Score, and AI Insight. Designed Prompt templates covering 10+ business scenarios , rebuilt System Prompt for consistency. Independently shipped Recovery and Strain modules with verifiable AI sources — passed App Store compliance review.
  • AI customer support agent. Agent-architected bot with live knowledge base, multi-turn QA, intent detection; pushed SEO + GEO dual-track optimization to surface the product on AI search platforms like ChatGPT.
  • Full-stack growth + payments. Independently shipped Web2 + Web3 payment system across multi-chain and traditional rails; built invite/viral growth backbone for TGE; wired Shopify inventory ↔ logistics state machine. Designed Bonding Curve sale + oversell guard. Supported $5M+ smart-ring GMV.
  • TGE security hardening. Patched Clickjacking and 10+ critical endpoint vulns — zero security incidents through launch. Optimized Solana/SUI payment confirmation from hours to seconds. Built multi-dimensional reporting (users, points, invites, country).
Beijing Academy of Big Data / Shanghai Pinjian Intelligent Tech
Senior Backend Engineer · AIoT / IAM / Face Recognition
2022.07 – 2024.03 Shanghai · Beijing
GolangGinGorm gRPCCasbinDlib Docker/K8sPrometheus
  • AIoT platform. Owned the company's core AIoT business platform covering multiple device protocols. Achieved 10B+ time-series records/day stable single-node write & query.
  • AI containerization. Containerized AI workloads, improved resource utilization & isolation, drastically cut hardware costs.
  • IAM + Face Recognition. Built RBAC-based unified IAM platform (Gin, Casbin, JWT, Redis, Viper). Patched a long-standing Dlib bug in the open-source face-recognition stack — 99%+ recognition accuracy.
  • Monitoring + high-perf HTTP proxy. Built Prometheus + Grafana + Node-Exporter + WeChat-bot alerting; deep-dived Celery / Ants / Viper source to ship a high-throughput HTTP proxy.
Baishan Cloud Technology
Big Data Platform Engineer · Log Query / Containerization
2021.05 – 2022.04 Beijing
GolangEchoAnts KafkaFlumeDocker/K8sS3
  • Log query component. Built with Golang + Echo + Viper + Ants, exposing S3-backed log query. Limiting Goroutine concurrency via Ants delivered 23× query performance.
  • Containerization. Docker + K8s migration cut compute footprint from 48 cores → 3 cores.
  • PB-scale log platform. Built components for PB-scale log platform with Kafka + Flume; full CI/CD ownership across requirements, dev, test, deploy.
Baidu · Data Engine Department
Intern · Map Navigation / Data Quality
2017.07 – 2017.11 Beijing
  • Map navigation data quality. Walking-navigation data analysis, annotation training & QC. Lifted QC accuracy 80% → 95%+, saving the team ~20% in cost.
04Featured projects

Things I built that shipped.

CUDIS · 2024–2026 AI INFRA

CUDIS AI Agent Platform

From-zero AI Agent infrastructure: RAG knowledge base, dual-layer memory (short-term conversation + long-term user profile), unified AI API surface. Powers AI Coach, AI Plan, customer support — every reply carries verifiable sources for App Store compliance.

40% faster delivery
60%+ lower onboarding cost
10+ prompt templates
LangChain · Python · RAG
CUDIS · TGE WEB3 + PAYMENTS

Web2 + Web3 Payment Engine

Multi-chain payments + traditional rails — Solana, SUI, Stripe, Jupiter, Alchemy Pay — wired into invite/viral growth, Shopify inventory sync, Bonding Curve sales with oversell guard.

$5M+ GMV supported
sub-sec confirmation
CUDIS · TGE SECURITY

TGE Hardening & Anti-abuse

Patched Clickjacking + 10+ critical endpoint vulnerabilities; built dynamic interception & memory-release strategy for oversell risk; zero security incidents through launch.

0 incidents
10+ vulns fixed
BDR · 2022–2024 DATA PLATFORM

AIoT Time-Series Platform

Core AIoT business platform covering multiple device protocols; single-node stable write & query at 10B+ records/day.

10B+ records / day
Golang · TSDB · MQ
Baishan · 2021–2022 PERF + INFRA

PB-Scale Log Query & Cost Cut

Golang/Echo log query over S3, Ants-bounded concurrency for 23× throughput; Docker + K8s migration that cut compute from 48 cores to 3.

23× query speedup
48→3 cores
BDR IDENTITY · CV

IAM + Face Recognition

RBAC IAM (Casbin/JWT/Redis) + face recognition platform; patched a Dlib bug for 99%+ accuracy.

99%+ accuracy
Claude + Harness AI · JOB MATCHING

Harness Job Matcher

Claude-powered intelligent job matching platform; leveraging LLM for resume parsing, skill analysis, and personalized job recommendations.

Claude LLM Integration
Python · FastAPI · LangChain
06Harness Integration

Interactive Demo

Try the live Harness job matching platform

05GitHub

Code in public.

A snapshot of what I write when no one's paying me to write it.

github.com/HungYann @HungYann ↗
67
Public Repos
27
Followers
5+
Years Coding
∞
Passion
06Education

Three countries, two degrees, one passport full of stamps.

2019 — 2021 · Malaysia
Universiti Malaya
M.Sc. Data Science
QS Top 100 GPA 3.78 / 4.0 Distinction
2018 — 2019 · Sweden
Halmstad University
B.Sc. CS & EE · 3+1 Exchange
1st-class Scholarship Full Tuition Waiver
2015 — 2019 · China
Beijing Information Sci. & Tech. University
B.Eng. Software Engineering
GPA 87/100 Top 4% Multiple Scholarships
07Achievements

Papers, patents & languages.

🌐
IELTSOverall Band 7
📚
English CET-4 & CET-6Certified
🗾
Japanese N5JLPT
📄
NLP PaperAutomatic Fraud Detection on Employment Scam Datasets Using ML
🧪
PatentA Method for Massive IoT Device Data Collection & Management
💾
Software Copyrights ×2AI Monitoring · Go Cloud-Native Face Recognition Platform
08Contact

Let's build something
people actually use.

I'm currently open to AI engineering, backend, and Web3 roles — full-time, remote, or relocation. Best path to my inbox below.

Email me → Telegram
Email
liuhongyang001@gmail.com
Phone · CN / HK
+86 13269108855 · +852 5660 4584
Telegram
@hungyang
GitHub
github.com/HungYann