Browse categories
Explore
Fiverr Pro
English
$
USD
I will develop solidity smart contracts and rust crypto backends
About this Gig
I build the on-chain and off-chain parts of a crypto product that have to stay correct under load.
On-chain, I write Solidity for EVM chains: tokens, vaults, allowlists, and permissioned transfers. Contracts are specified, tested, and deployed so only eligible accounts can move the asset. Fills, mints, and burns emit events the off-chain stack can replay. I use Foundry or Hardhat, keep the ABI stable, and document the trust boundary before go-live.
Off-chain, I use Rust when concurrency matters. An async gateway admits orders or chain events, runs pre-trade or pre-settlement checks, then hands work to an in-memory engine. State appends to a sequenced log so the book can be recovered after a crash. Indexers fan out separately and never block the hot loop.
Settlement stays consistent. The ledger is the source of truth for available balance; batches go on-chain; a reconciler compares ledger balances with on-chain supply and flags breaks before the next session.
This gig is for a real stack, not a meme-token template: a contract, a Rust service, and the controls that keep them aligned.
Tell me the chain, the asset rules, and whether you need the contract, the engine, or both.
Purpose:
Collectibles
•
DeFi
•
Gaming
•
Web browser
•
NFT
•
Smart Contracts
Programming language:
Go
•
JavaScript
•
Rust
•
Node.js
Keep your assets and information safe
Cryptocurrency services focus solely on developing and programming. Never share sensitive information or private keys with others.
My Portfolio
FAQ
Which chains do you support?
EVM chains: Ethereum, Base, Arbitrum, Optimism, Polygon, and BNB. Rust services are chain-agnostic and can index or settle against those networks. Solana or other non-EVM work needs a custom offer first.
Do I get the source code?
Yes. Every package includes the Solidity and Rust source, tests, ABI, and setup notes. You own the delivery. I do not keep admin keys after handover unless you ask me to stay on for ops.
Is a mainnet deploy included?
Basic and Standard include a testnet deploy. Mainnet verify-and-handover is the Mainnet deploy extra. You pay gas from your wallet. I will not deploy from a wallet I control.
What is not included?
Token marketing, listing on an exchange, legal opinions, and a formal third-party audit are not included. I write tests and document the trust boundary. An external auditor should still review before mainnet if the TVL is material.
Can you audit an existing contract?
I can review and harden a contract you already have, then add tests. That is a custom offer if the codebase is large. This gig is build-first: new contracts and Rust services, not a full audit firm report.
What do you need from me to start?
The chain, the asset rules (who can hold, transfer, or settle), and whether you want the contract, the Rust engine, or both. If you have an existing ABI or repo, send the link after you order.
Do you build meme coins or pump tokens?
This gig is for permissioned tokens, vaults, settlement, and high-concurrency Rust backends. I will decline anonymous mint-and-dump tokens and anything that needs hidden mint or pause keys.
