Gimer – Solana, Solidity, Smart contracts

It's a crypto wallet that supports payments across different Blockchains using the ARST token.

• Developed smart contracts in Solidity for a multisig wallet, vault, and ERC20 token.
• Created a multi-chain listener to support the on-ramp/off-ramp process (e.g., payments detection and reimbursement).
• Optimized the RPC module to filter events and payments related to the ARST token on several networks.
• Created a battery of integration tests to validate the implementation of the reimbursement module on multiple networks.
• Built scripts using JavaScript to interact with several networks such as Stellar, Base, Injective, BNB, and Arbitrum.
• Collaborated with the auditors from Base and Nethermind to review and improve the smart contracts.

It's a decentralized prediction market on Base that lets users create and trade on event outcomes using ARST and USDC, with parimutuel payouts, creator and protocol fees, and reduced fees for ARST stakers.

• Designed and implemented the core prediction market smart contracts on Solidity/Foundry.
• Built the full market lifecycle: creation, admin approval, betting, resolution, cancellation, and winnings claims.
• Implemented parimutuel payout logic where winners share the total pool proportionally to their stake.
• Added dual-currency support for ARST and USDC markets with configurable allowed tokens.
• Designed a fee model with market creation fees, per-bet fees, and revenue split between creators and the protocol.
• Integrated ARST staking to offer tiered badge discounts on betting fees based on staked balance.
• Implemented role-based access control (Super Admin, Admin, Subscriber) with pausable emergency controls.
• Integrated Aerodrome V3 pool pricing to calculate ARST-denominated market creation fees in USDC terms.
• Developed a staking contract with reward distribution for ecosystem incentives.
• Wrote a comprehensive Forge test suite covering market creation, betting, resolution, cancellation, access control, and badge discounts.
• Developed a front-end in React to interact with the contracts.

It's an experimental zkEVM-based solution that uses Polygon Validium to store data off-chain, enabling users to exit without on-chain data availability.

• Developed and modified smart contracts in Solidity to implement the Plasma Free protocol.
• Reversed-engineered the Off-chain system developed in Golang to connect our enhanced smart contracts.
• Implemented forced transactions to exit the L2 network.
• Created multiple tests in Hardhat to validate our new approach.
• Enhanced the off-chain system written in GO to process and manage forced transactions.
• Improved the Data Availability (DA) mechanism to recover the system after users have exited the L2 network using forced transactions.
• Presented the progress to the client and the rest of the team on a bi-weekly basis.

It's a Decentralized Exchange based on Uniswap V2 and V3.

• Architected and developed the smart contracts to implement a Decentralized Exchange.
• Researched and back-engineered Uniswap V2 and V3 projects to implement our project based on these protocols.
• Developed a test suite using JavaScript, ethers.js, and hardhat.
• Collaborated with an engineering team to integrate the smart contracts with the front-end and back-end.
• Created scripts to deploy the contracts in several networks such as Ethereum, Arbitrum, and Base.
• Implemented security measures to prevent slippage, reentrancy attacks, MEV attacks, and integer overflows.