You will get Custom Smart Contract Development - Solidity + Full Test Suite
Project details
I'll develop your custom smart contract from scratch with security and testing built in.
What makes my development different:
🔒 Security-First Approach
Most developers write code and worry about security later. I don't. Every contract includes reentrancy protection, Checks-Effects-Interactions pattern, proper access control, and input validation from day one. Security isn't an afterthought - it's the foundation.
🧪 Testing While Building
I write tests during development, not after:
• 90%+ test coverage minimum
• Unit tests for every function
• Integration tests for workflows
• Fuzz testing for critical functions
• Edge cases covered before they become exploits
⚡ Gas Optimization Included
Your users pay transaction fees. I minimize costs with custom errors (~99% gas savings vs strings), efficient storage patterns, and function-level profiling. Recent example: reduced a MultiSig by 6% using optimization techniques.
📚 Complete Documentation
NatSpec comments explaining WHY not just what. README with usage examples. Architecture decisions documented. Deployment instructions. Integration guide. Six months from now, you'll still understand the code.
What makes my development different:
🔒 Security-First Approach
Most developers write code and worry about security later. I don't. Every contract includes reentrancy protection, Checks-Effects-Interactions pattern, proper access control, and input validation from day one. Security isn't an afterthought - it's the foundation.
🧪 Testing While Building
I write tests during development, not after:
• 90%+ test coverage minimum
• Unit tests for every function
• Integration tests for workflows
• Fuzz testing for critical functions
• Edge cases covered before they become exploits
⚡ Gas Optimization Included
Your users pay transaction fees. I minimize costs with custom errors (~99% gas savings vs strings), efficient storage patterns, and function-level profiling. Recent example: reduced a MultiSig by 6% using optimization techniques.
📚 Complete Documentation
NatSpec comments explaining WHY not just what. README with usage examples. Architecture decisions documented. Deployment instructions. Integration guide. Six months from now, you'll still understand the code.
Web Programming Project
Blockchain DevelopmentProgramming Languages
JavaScript, GoCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$1,480
|
Standard
$3,800
|
Advanced
$7,500
|
|---|---|---|---|
| Delivery Time | 5 days | 7 days | 14 days |
Number of Revisions | 0 | 1 | 2 |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$500 - $2,480
Mainnet Deployment
(+ 1 Day)
+$400
Frontend Integration Help
(+ 3 Days)
+$1,200
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FR
Frank R.
Sep 3, 2025
Cloudflare optimization for WordPress site
Excellent work. Facundo fixed our WordPress site and made it noticeably faster by optimizing our Cloudflare settings. Fast, professional, and highly recommended. He is now part of our team.
About Facundo
Full-Stack Web3 & Next.js Engineer | EVM, Product-Grade Frontend
Montevideo, Uruguay - 5:53 pm local time
I'm a full-stack engineer specialized in Web3 integrations and high-performance
frontend — the intersection where EVM meets great UX. I work with founders and
product teams who care about what they're building, not just who's cheapest.
What I bring to the table:
→ NFT marketplace development (ERC-721/1155, minting, migrations, royalties)
→ Wallet authentication & Web3 integrations (wagmi, ethers.js, viem, WalletConnect)
→ Next.js & TypeScript at scale — clean architecture, fast load times, real DX
→ Smartcontract Development — transparent and secure for your business
→ Backend fluency in NestJS — I can own the full stack when the project calls for it
I've shipped platforms that handle real users and real money. I understand that
smart contract logic is only half the work — the wallet UX, error states, and
gas feedback are where trust is built or lost.
I also build product outside of client work. Cadetería Punto Centro is a
logistics SaaS I designed and built from scratch: QR-based package tracking
(à la MercadoLibre), AI-optimized routing, client-level P&L dashboards, and
a full admin panel. It runs a real business in production.
I'm selective about what I take on — not because I'm difficult, but because
I only commit to work I can do exceptionally.
If you're building something that matters and need an engineer who thinks like
a product person: let's talk.
Steps for completing your project
After purchasing the project, send requirements so Facundo can start the project.
Delivery time starts when Facundo receives requirements from you.
Facundo works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & Planning (
After you order, I'll review your requirements and ask any clarifying questions. Within 24 hours, you'll receive a project plan with architecture overview and timeline confirmation.
Development & Testing
I write the smart contracts with tests alongside (not after). You'll get progress updates every 2-3 days. Code is committed to a private GitHub repo you can access anytime.