Smart Contracts
- Solidity (0.8.x)
- Hardhat & Foundry
- OpenZeppelin upgradeable (UUPS)
- Chainlink VRF & Automation
- ERC-20 / ERC-721 / ERC-1155
Available for full-time, contract, or freelance
I build production software — Web3 security, token launches, and AI SaaS.
I'm Joseph — a backend engineer (B.S. CS, WGU) who ships production systems end-to-end. Three live products: SecureFlow (AI contract scanner backend), MemeFactory (Web3 launch infrastructure), and AgentFlow (AI customer support API). Python and Node.js pipelines, LLM orchestration, smart-contract analysis — from architecture to production ops.
- 5+Years building software
- 3Live products shipped
- SoloEnd-to-end builder
About
Independent. Focused. Shipping in production.
I work as a one-person team — product, backend, frontend, deployment, and ops. Every project I ship is end-to-end my responsibility, from a Solidity contract or Python LLM pipeline to the React dashboard behind a CDN.
I focus on reliable, auditable code. The proof is the live products you can use today — SecureFlow, MemeFactory, and AgentFlow — not slide decks.
When I'm not writing contracts I'm reading post-mortems on DeFiHackLabs, studying real exploits, and turning them into checklists for my own deployments.
- Name
- Joseph Chen
- Role
- Backend Engineer · Blockchain · AI
- Education
- B.S. Computer Science, Western Governors University (WGU), 2021
- Location
- Remote, United States
- Availability
- Open to full-time, contract, or freelance — remote
- GitHub
- github.com/JosephChen2027 (16 public repos)
- Josephbbob@proton.me
Stack
What I work with every day.
DeFi & Protocols
- AMMs & liquidity design
- Lottery / yield / staking primitives
- Memecoin launch mechanics
- Pull-payment patterns
- Front-running mitigation
Frontend
- React / Next.js
- TypeScript
- HTML5 / CSS3 / Tailwind
- ethers.js / wagmi / viem
- WalletConnect & RainbowKit
AI / LLM
- GPT-4o / Claude
- RAG & embeddings
- LangChain pipelines
- Prompt engineering
- AI agent platforms
Security & Tooling
- Slither & Mythril
- Fuzz testing (Foundry)
- AI-assisted contract review
- Multi-LLM vulnerability triage
- Linux VPS / Cloudflare
Selected work
Things I built and shipped.
Live · B2B SaaS
SecureFlow
AI-powered smart contract & security questionnaire engine.
SecureFlow continuously monitors Ethereum and Arbitrum for newly deployed contracts and runs them through a multi-layer AI pipeline (GPT-4 / Claude + Slither) to surface 15+ classes of vulnerabilities — reentrancy, access control, oracle manipulation, and more. The same engine powers an enterprise B2B mode that auto-answers vendor security questionnaires from your own docs, with citations.
- Python
- Slither
- OpenAI / Anthropic
- SQLite
- SaaS dashboard
Live · Web3 agency
MemeFactory
Full-service memecoin launch agency for content creators.
MemeFactory helps creators turn their audience into a token economy — end-to-end, with zero upfront cost. Token deployment on Solana, Ethereum, or Base; viral launch campaigns across X, Telegram, and TikTok; community building; influencer coordination; and exchange listings. A creator-first playbook from strategy call to handover in ~30 days.
- Solidity
- Solana / Base
- Token launch
- Community ops
- Go-to-market
Live · B2B SaaS
AgentFlow
AI customer support agents for startups — deploy in minutes.
AgentFlow lets businesses deploy a custom AI support agent on any website with a one-line embed. Train agents on a knowledge base, handle ~80% of tier-1 tickets automatically, and track resolution rates from a live dashboard. Built with Next.js 15, TypeScript, and OpenAI — demo mode works without an API key for sales calls and onboarding.
- Next.js 15
- TypeScript
- OpenAI
- RAG
- Embed widget
Open source
Reference code on GitHub.
16 public repos — backend APIs, job queues, ops tooling, AI pipelines, and smart-contract references. All MIT-licensed with tests and CI.
Backend & IT
Python · SQLite
url-shortener
Link shortening with click analytics
Python · SQLite
job-queue
Background workers with retries
Python · REST
rest-inventory
CRUD inventory JSON API
Python
log-analyzer
Access log parsing & traffic reports
Python
health-monitor
HTTP uptime & latency checks
Python · AI
rag-pipeline
Document chunking & TF-IDF retrieval
Python · AI
secureflow
Smart-contract scanner backend
Node.js · RAG
agentflow
AI customer support API
Blockchain
Solidity · Foundry
lending-pool
Collateral, borrow, liquidate
Solidity · Foundry
simpleswap
Uniswap V2-style AMM
Solidity · Foundry
yieldvault
DeFi staking vault
Solidity · Foundry
moonrocket
Launch-gated memecoin token
Solidity · Foundry
fairmint
Deflationary burn mechanics
Python
dex-arb-scanner
DEX spread scanner
FAQ
Common questions.
What kind of backend work do you take on?
Production backend systems: Python/Node.js APIs, async workers, LLM pipelines, blockchain data ingestion, smart-contract analysis (Slither), RAG inference, and deployment automation. I ship end-to-end — schema design through production monitoring.
Are you available for full-time roles?
Yes. Open to full-time, contract, freelance, or advisory engagements. Remote-first, US-based.
What chains have you shipped on?
Primarily Ethereum, Arbitrum, and BNB Smart Chain (SecureFlow scanning targets). Comfortable with any EVM chain.
Can I see code samples or audit reports?
Yes — live demos at SecureFlow, MemeFactory, and AgentFlow, plus code walkthroughs and audit summaries available on request via email.
Do you also do AI/LLM backend work?
Yes. AgentFlow and SecureFlow both run production multi-LLM pipelines — RAG, embedding ingestion, GPT-4o/Claude orchestration, and structured inference APIs.
Where can I find your open source code?
16 public repos at github.com/JosephChen2027 — Python backends (url-shortener, job-queue, rest-inventory), ops tools (log-analyzer, health-monitor), AI (rag-pipeline), and Solidity/Foundry DeFi references.
Contact
Looking for a backend engineer?
I'm open to full-time, contract, freelance, or advisory work — backend roles in Web3, AI, or platform engineering. B.S. CS, WGU 2021. Browse the live products and open-source repos above, or send me a note if you want to talk.