Blockchain & Web3 Specialist | Smart Contract & DApp Engineer

Contact for pricing

About this service

Summary

Service Overview
## What I Offer
I develop secure and scalable blockchain solutions, specializing in smart contract development and full-stack DApp implementation. From DeFi protocols to NFT platforms, I deliver production-ready Web3 applications with comprehensive documentation and ongoing support.
## Who It's For
Ideal for startups, enterprises, and organizations looking to:
- Launch new blockchain-based products or services
- Integrate Web3 functionality into existing applications
- Develop secure smart contracts and DeFi protocols
## What You Get
- Production-ready smart contracts and DApps
- Comprehensive technical documentation
- Security audit reports and best practices
- Deployment and maintenance support

Process

## 1. Discovery & Planning (1-2 weeks)
- Initial consultation and requirements gathering
- Technical architecture planning
- Project scope and timeline definition
- Deliverables and milestones agreement
## 2. Design & Architecture (1-2 weeks)
- Smart contract architecture design
- System architecture documentation
- Technical specifications
- Security considerations review
## 3. Development & Testing (4-8 weeks)
- Smart contract development
- Frontend/Backend implementation
- Unit testing and integration testing
- Security audits and optimizations
## 4. Deployment & Launch (1-2 weeks)
- Testnet deployment and validation
- Mainnet deployment
- Documentation finalization
- Knowledge transfer and training
## 5. Support & Maintenance
- Post-launch monitoring
- Bug fixes and updates
- Ongoing technical support
- Performance optimization

FAQs

  • How long does a typical blockchain project take?

    Most projects take 8-12 weeks from start to finish, depending on complexity. A detailed timeline will be provided after the initial consultation.

  • What blockchain networks do you work with?

    I primarily work with Ethereum and EVM-compatible networks (BSC, Polygon, Avalanche), but can adapt to other blockchain platforms based on project requirements.

  • How do you ensure security?

    Security is paramount in blockchain development. I follow industry best practices, conduct thorough testing, implement audit recommendations, and use battle-tested libraries like OpenZeppelin.

  • What are your payment terms?

    Projects are typically structured with a 40% upfront payment, 30% at midpoint milestone completion, and 30% upon project delivery. Hourly rates are available for ongoing support.

  • Do you provide support after launch?

    Yes, I offer post-launch support packages that include monitoring, maintenance, and technical support to ensure your project runs smoothly.

  • Can you help with existing projects?

    Yes, I can audit, optimize, or extend existing blockchain projects. A technical assessment will be conducted to determine the best approach.

What's included

  • Production-Ready Smart Contracts

    Clean, optimized, and thoroughly tested smart contract code ready for deployment

  • Technical Documentation

    Comprehensive documentation including architecture diagrams, function specifications, and deployment guides

  • Security Audit Report

    Detailed security analysis and vulnerability assessment of smart contracts

  • Frontend Application

    Responsive Web3 interface with wallet integration and transaction handling

  • Backend Infrastructure

    API endpoints, database architecture, and server-side logic for DApp functionality

  • Integration Guide

    Step-by-step documentation for API integration and third-party service connections

  • Blockchain Consultation Package

    Detailed system design documents and technical specifications

  • Implementation Roadmap

    Project timeline, milestone breakdown, and resource allocation plan

  • Best Practices Guide

    Security recommendations, gas optimization strategies, and maintenance procedures

  • Deployment Scripts

    Automated scripts for contract deployment across different networks

  • Testing Suite

    Comprehensive test cases covering all contract functionalities

  • Maintenance Documentation

    Guidelines for updates, upgrades, and ongoing maintenance procedures

Recommendations

(5.0)

James Brooks

Client • Jan 8, 2025

Working with Justin was an exceptional experience! He played a crucial role in a startup project that involved API integration with AI-powered solutions. His deep technical expertise in full-stack development, combined with his ability to deliver scalable and reliable solutions under tight deadlines, was key to the project's success. Justin is not only highly skilled in React, Node.js, and cloud technologies but also a great collaborator, always willing to go the extra mile. He's a nice talent!


Skills and tools

Blockchain Developer
Smart Contract Engineer
Web Developer
Ethereum
Hardhat
MetaMask
Solidity
Web3.js

Industries

Collectibles
Decentralized Finance (DeFi)
Web3

Work with me