You will get A secure Solidity smart contract | Backend Infrastructure
Project details
I will develop secure, production-ready Solidity smart contracts and Web3 backend integrations for your blockchain project. Whether you need an ERC-20/ERC-721 token, staking, DeFi protocol, payment system, account abstraction (ERC-4337), or custom smart contract, I deliver clean, gas-optimized, well-tested code using modern development practices. I also build Node.js backends that interact with EVM-compatible chains, enabling seamless blockchain integrations for your application. Every project is developed with security, maintainability, and scalability in mind.
Programming Languages
JavaScriptCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$450
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$100Frequently asked questions
About Charles
Backend & Smart Contract | Solidity, EVM specialist, Node.js, JS
Owerri, Nigeria - 9:52 pm local time
My expertise spans Solidity, low-level EVM engineering (Yul, Assembly, and Huff), protocol security, backend APIs, database design, and blockchain infrastructure.
I specialize in designing complete systems—not just writing smart contracts. From DeFi protocols and Account Abstraction wallets to backend services and blockchain integrations, I build solutions that prioritize security, scalability, maintainability, and performance.
My backend stack includes Node.js, Express.js, MongoDB, Mongoose, REST APIs, Ethers.js, authentication, and blockchain integrations. I enjoy building reliable backend architectures that bridge on-chain and off-chain systems.
Core Expertise
* Solidity
* Low-Level EVM Development (Assembly, Yul & Huff)
* Foundry
* Smart Contract Security
* Upgradeable Smart Contracts
* Protocol Architecture
* Gas Optimization
* Advanced Testing (Unit, Fuzz & Invariant)
* Node.js
* Express.js
* MongoDB & Mongoose
* REST APIs
* Blockchain Infrastructure & Integrations
* Ethers.js
Whether you need secure smart contracts, blockchain integrations, backend APIs, or complete blockchain-powered systems, I can help turn your ideas into reliable production software..
Steps for completing your project
After purchasing the project, send requirements so Charles can start the project.
Delivery time starts when Charles receives requirements from you.
Charles works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & Planning
Discuss your project requirements, desired functionality, supported networks, security considerations, and timeline.
Development
Develop the smart contract and/or Web3 backend using Solidity, Foundry, Node.js, and modern development tools. Progress updates are shared throughout development.