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I will create smart contract solidity developer ethereum
Smart Contract Engineer, Full Stack Web3, 15 Production Deployments
Launching a DeFi protocol, RWA project, or Web3 platform?
One smart contract bug can cost you everything.
I've deployed 15+ production contracts across Ethereum, Polygon,
Arbitrum, and Base, proces...
Level 2
Has met high performance criteria and has a proven track record for meeting client expectations.
About this Gig
One smart contract bug can cost you everything. I build secure, gas-optimized contracts that go to production, not just testnet.
I'm Usman, a Senior Blockchain Engineer with 5+ years deploying secure, gas-optimized contracts across Ethereum, Polygon, Arbitrum, and Base.
What I've Built:
- 15+ production smart contracts processing 500+ concurrent transactions
- DeFi protocols: staking systems, token vesting, liquidity pools, DEX implementations
- RWA Protocols for asset tokenization (ERC 3643, etc).
- Custom ERC20/ERC721/ERC1155 tokens with advanced features (anti-whale, taxes, burning, allowlists)
- Full-stack Web3 apps with React/Next.js frontends and Node.js/Go backends
What You Get:
- Security-first development: 95%+ test coverage, audit-ready code
- Gas optimization: Proven 30% reductions
- Production-proven: Real projects with 99.9% uptime
- Complete documentation and testing.
- Multi-chain deployment support.
Services:
- Smart contract development (Solidity, Hardhat, Foundry)
- RWA, DeFi protocols and tokenomics
- Frontend integration
- Contract audit and optimization
Perfect For:
- Web3 startups,
- DeFi projects,
- NFT launches,
- token creators who need secure, production-grade contracts
Token standard:
ERC-20
Programming Language:
Solidity
Blockchain platform:
Ethereum
My Portfolio
FAQ
How do I know my contract will be secure?
Every contract I deliver goes through a structured security process: full test suite with 95%+ coverage using Hardhat or Foundry, manual review against common vulnerability patterns (reentrancy, overflow, access control gaps), and gas optimization passes. The code follows OpenZeppelin standards.
Which blockchains do you deploy to?
Ethereum, Polygon, Arbitrum, Base, and BSC. All EVM-compatible chains. I handle testnet deployment first, then mainnet after your approval.
What do I need to provide to get started?
Your token/project requirements and which chain you want to deploy on. I'll handle everything else: development, testing, deployment, and verification on the block explorer.
Please show me your previous projects.
Sure, please have a look at my portfolio in my profile. I've worked on DExs, CEXs, NFTs, ERC standards and etc.
Do you have experience working with uniswap/pancakeswap/aave?
Yes, I do have hands on experience on these. I have forked them and also customized to fit the client's need in the past.
Have you worked with Proxies?
Yes, I have worked on various proxy standards for upgradability. UUPS, transaparent proxy, diamond and etc.
Reviews
25 reviews for this Gig
| (25) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
E edwinn07
United States
Good fullstack blockchain developer, helped me quickly.
Up to $50
Price
1 day
Duration
U 
Seller's Response
Helpful?H 
hivibez
Repeat Client
United States
I have hired Usman for multiple projects and he delivers every time. This project had many complexities and we were able to work through them together. His communication and responsiveness are excellent. The most important is that he has been trustworthy. Great job, we look forward to future projects.
$400-$600
Price
5 weeks
Duration
U Seller's Response
Helpful?H hamoddi1
Slovakia
The best developer. He delivered as promised and working with him was super easy and smooth. I recommend everyone to work with Mr. Usman 👍🏼
$600-$800
Price
9 days
Duration
U Seller's Response
Helpful?H hivibez
Repeat Client
United States
Great Job!
Up to $50
Price
1 day
Duration
Helpful?H hivibez
Repeat Client
United States
On going work, he continues to deliver will continue to hire.
Up to $50
Price
1 day
Duration
U Seller's Response
Helpful?
Reviews
25 reviews for this Gig
| (25) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
E edwinn07
United States
Good fullstack blockchain developer, helped me quickly.
Up to $50
Price
1 day
Duration
U Seller's Response
Helpful?H hivibez
Repeat Client
United States
I have hired Usman for multiple projects and he delivers every time. This project had many complexities and we were able to work through them together. His communication and responsiveness are excellent. The most important is that he has been trustworthy. Great job, we look forward to future projects.
$400-$600
Price
5 weeks
Duration
U Seller's Response
Helpful?H hamoddi1
Slovakia
The best developer. He delivered as promised and working with him was super easy and smooth. I recommend everyone to work with Mr. Usman 👍🏼
$600-$800
Price
9 days
Duration
U Seller's Response
Helpful?H hivibez
Repeat Client
United States
Great Job!
Up to $50
Price
1 day
Duration
Helpful?H hivibez
Repeat Client
United States
On going work, he continues to deliver will continue to hire.
Up to $50
Price
1 day
Duration
U Seller's Response
Helpful?
