# Hire a Blockchain Developer | $15–35/hr

> Hire a dedicated blockchain developer for $15–35 per hour. Smart contracts, DeFi flows, and payment rails engineered by a vetted Sentient Arc developer.

A vetted blockchain developer from Sentient Arc comes in at $15–35 per hour, depending on protocol complexity and seniority. Smart contracts, DeFi, and fintech rails, starting with a free consultation.

## Rate & engagement
- **Rate:** $15–35/hr
- **Engagement:** Part-time or full-time
- **Start:** Within 1 week
- **Overlap:** 4+ hrs your timezone

## On-chain mistakes are permanent
A bug in ordinary software is a patch; a bug in a deployed contract is an incident with a dollar value attached. The cost of a wrong hire on chain is measured in drained pools, not missed sprints.

Engineers who combine contract-level security instincts with real product sense are rare, and marketplaces cannot vet for them. Most portfolios show testnet toys, not systems that held value.

## Test-first, audit-ready
Contracts are written against exhaustive test suites, fuzzed where value concentrates, and deployed in stages: testnet, guarded launch, then full exposure. Upgrade paths and admin keys are designed, not improvised.

The work does not stop at the contract boundary. We build the full flow around it: indexing, frontends, wallets, and the payment or fintech integrations that connect on-chain value to your product.

## What they own
- **Smart contract development**: Solidity contracts with exhaustive tests, staged deploys, and upgrade paths designed up front.
- **DeFi mechanics**: Swaps, pools, staking, and token flows modeled and tested before a single unit of value moves.
- **Marketplaces & exchanges**: NFT marketplaces and exchange builds, from matching logic to custody-aware architecture.
- **Fintech integration**: Payment gateways, wallets, and on/off-ramps wired into the product with compliance in mind.

## Stack
- **Contracts:** Solidity, Hardhat, Foundry, Contract testing
- **Protocols:** DeFi protocols, Swaps, NFT marketplaces, Exchanges
- **Integration:** Ethers.js, Wallets, Payment rails, Indexers

## FAQ
**How much does it cost to hire a blockchain developer?**

Plan for $15–35 per hour, depending on protocol complexity and seniority. A free consultation scopes the contracts and flows before anything is billed.

**Which chains and stacks do you cover?**

EVM chains are the core: Solidity with Hardhat or Foundry, Ethers.js frontends, and the indexing layer around them. Other ecosystems are scoped per project during the consultation.

**Can you take over an existing protocol or contract?**

Yes. Takeovers start with a review and a test suite around the current behavior, so changes and redeploys happen against evidence instead of hope.

**Do you build the app around the contracts too?**

Yes. Most engagements are full-stack web3: the contracts plus the frontend, wallet flows, and indexing that turn them into a usable product.

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Canonical page: https://www.sentientarc.com/hire/blockchain-developer