Blockchain Developer

SOLANA BLOCKCHAIN ENGINEER (RUST) (Paid) Role Overview Job Title: Solana Blockchain Engineer - Smart Contracts & Settlement Infrastructure Company: GoQuant Technologies Inc. Location: Remote  Employment Type: Full-time Start Date: Immediate Primary Responsibilities Smart Contract Development (60%)- Design and implement Solana programs using Rust and Anchor framework - Build perpetual futures contracts with dynamic funding rates (1-second calculation, hourly payment)- Develop position management system supporting up to 1000x leverage with robust liquidation mechanics - Implement collateral vaults, margin calculations, and PnL tracking - Create ephemeral wallet authority system with on-chain permission management - Build settlement batching mechanisms for high-throughput trade execution Settlement Infrastructure (30%)- Develop transaction batching and relayer services for efficient on-chain settlement - Implement Merkle tree verification for trade batch integrity - Build wallet transaction signing infrastructure for automated settlement - Create monitoring systems for failed settlements and automatic retry logic - Design and implement program-controlled vaults with secure custody patterns Integration & Testing (10%)- Integrate with Pyth/Switchboard price oracles for mark price and funding rates - Build comprehensive test suites (unit, integration, and on-chain testing)- Deploy and maintain programs on Solana devnet/testnet/mainnet - Performance optimization for high-frequency trading scenarios - Documentation of smart contract architecture and settlement flows Key Technical Challenges - Performance: Handle 100+ trades/second with sub-second settlement latency - Security: Manage user funds non-custodially with multiple safety mechanisms - Scalability: Batch thousands of trades efficiently to minimize transaction costs - Risk Management: Build real-time liquidation systems that protect protocol solvency - UX: Enable fast trading via ephemeral wallets while maintaining security Required Qualifications Technical Skills: - 3+ years of professional Rust development experience - 1+ years building on Solana (programs deployed to mainnet preferred)- Strong understanding of Solana's programming model (accounts, PDAs, CPIs, rent)- Experience with Anchor framework for Solana program development - Proficiency with cryptographic signatures and wallet transaction signing - Deep knowledge of blockchain fundamentals (consensus, finality, state management) DeFi Experience: - Understanding of perpetual futures mechanics (funding rates, leverage, liquidations)- Experience with DeFi protocols (DEXs, lending, derivatives)- Knowledge of oracle integration patterns - Familiarity with common DeFi security patterns and vulnerabilities Software Engineering: - Strong systems programming background - Experience with concurrent/parallel programming - Ability to write clean, well-tested, production-quality code - Comfortable working in fast-paced startup environment - Self-directed with strong problem-solving skills Preferred Qualifications - Experience building settlement/relayer infrastructure for DEXs - Knowledge of dark pool or institutional trading mechanics - Contributions to open-source Solana projects - Experience with Solana web3.js, anchor-ts, or similar SDKs - Background in smart contract security auditing - Familiarity with TypeScript/Node.js for off-chain components - Understanding of market maker systems and order book mechanics - Previous work on high-leverage or derivatives protocols - Experience with program upgrades and migration strategies