Ethereum Smart Contract for Crowdfunding

I'm looking for an expert in blockchain, specifically Ethereum, to develop a smart contract for a crowdfunding platform.

Key requirements:
- Extensive experience with Ethereum and smart contract development
- Proven track record of creating secure, efficient smart contracts
- Previous work with crowdfunding platforms is a plus
- Solid understanding of Solidity programming language
- Insight into Gas optimization strategies for Ethereum smart contracts

The smart contract should include refund options for backers.