Blockchain Developer

SOLANA BLOCKCHAIN ENGINEER (RUST) (Paid)Role OverviewJob Title: Solana Blockchain Engineer - Smart Contracts & Settlement InfrastructureCompany: GoQuant Technologies Inc.Location: Remote Employment Type: Full-timeStart Date: ImmediatePrimary ResponsibilitiesSmart 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 executionSettlement 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 patternsIntegration & 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 flowsKey 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 securityRequired QualificationsTechnical 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 vulnerabilitiesSoftware 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 skillsPreferred 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