Available for remote contract work worldwide
SaaS · AI agents · internal tools · marketplace automation · Web3 security
I'm a full-stack developer and entrepreneur building SaaS products, AI-agent workflows, internal tools, dashboards and Web3 security tooling.
My strongest lane is practical execution: turning messy business operations into working systems with auth, databases, APIs, automation, payments, dashboards, deployment and human approval gates.
I also research Solidity/EVM security, validate exploit paths with Foundry PoCs, and focus on vulnerabilities with real impact instead of theoretical reports.
Core thesis
├─ Make money: SaaS, dashboards, marketplaces, automation and client operations
├─ Protect money: Web3 security, exploit validation, infra and approval gates
└─ Build with leverage: AI agents, context, tools, memory and evidence trails| Need | What I build |
|---|---|
| Launch a SaaS or web app | Next.js/React products with auth, payments, dashboards, APIs and deployment |
| Automate business operations | WhatsApp, marketplace, CRM, financial and back-office workflows |
| Add AI agents to real workflows | Tool-using agents, browser/CDP automation, memory, approval gates and evidence trails |
| Fix or ship internal tools fast | Admin panels, data flows, integrations, scripts, VPS/Vercel/Supabase production fixes |
| Validate Web3/security risk | Solidity/EVM review, Foundry PoCs, fork tests and practical exploit analysis |
| Build | Type | What it proves |
|---|---|---|
| je4ndev.com / source | Portfolio + service surface | Product positioning, frontend delivery and public proof |
| Vultrix | Vertical SaaS / operations dashboard | Customers, jobs, pricing, operations, finance and workflow control |
| MepChat landing | WhatsApp support product landing | Low-ticket SaaS packaging, offer clarity and conversion surface |
| Hermes/OpenClaw agent workflows | AI agent operations | Local agents connected to tools, browsers, APIs, memory and approval gates |
| Smart contract security lab | Web3/security research | Solidity review, Foundry PoCs, fork tests and exploit validation |
Some production systems and client/internal workflows are private. The public repos show the execution style; the real value is shipping useful systems end-to-end.
- AI-agent workflows for real operators, not just chat demos.
- SaaS/internal tools for small teams that need speed and ownership.
- Marketplace and WhatsApp automation systems for Brazilian businesses.
- Practical Web3/security research with reproducible PoCs.
- Productized services that help people make or protect money.
More tools I use
- Frontend/Product: React, Next.js, Vite, Tailwind, shadcn/ui, dashboards and admin panels.
- Backend/Data: Node.js, REST APIs, PostgreSQL, Supabase, auth, storage and integrations.
- AI/Automation: OpenAI, Anthropic/Claude, xAI/Grok, browser automation, cron jobs, tool routing and agent memory.
- Infra: Vercel, Linux VPS, GitHub Actions, monitoring, deployment fixes and operational scripts.
- Security: Solidity, Foundry, Slither, Echidna, fork tests and exploit PoCs.
I focus on real, reproducible vulnerabilities.
- Solidity / EVM smart contract review.
- Foundry exploit PoCs and fork testing.
- DeFi protocol analysis: accounting, liquidity, vaults, oracles, access control and upgrades.
- Slither/Echidna-assisted review workflows.
- Damn Vulnerable DeFi 18/18 with writeups.
- Audit/contest experience across Sherlock, Cantina, CodeHawks and Immunefi.
Compact activity view focused on execution signals: contributions, commits, PRs, issues and private-work signals.
| Signal | Current snapshot |
|---|---|
| Contributions in the last year | 6,212 |
| Public repositories | 50 |
| Commits in the last year | 351 |
| Pull requests in the last year | 31 |
| Issues / ops items in the last year | 645 |
| Private/restricted contributions | 5,143 |
Main public repo languages: TypeScript · JavaScript · HTML · CSS · Solidity · Python