Smart Contract Engineer for Gasless Meta-transaction Relayer on Gnosis Chain

We are seeking an experienced Smart Contract Engineer to develop and implement a gasless meta-transaction relayer system on the Gnosis Chain. The core functionality of this system will allow users to sign typed data (EIP-712 signatures), with a dedicated relayer then submitting these transactions and covering the associated gas fees. The relayer will be reimbursed in xDAI from a sponsored wallet, and the system must include a rate limit of 100 transactions per day.

The project requires the development of a robust forwarder contract that supports EIP-712 signatures, incorporates nonce tracking, and provides native meta-transaction capabilities. Additionally, a Node.js relayer script will need to be developed to facilitate the transaction submission process. Key deliverables include comprehensive tests for the system, a deployment script, and successful verification on the Gnosis Chain Explorer. The expected deadline for this project is 10 days.