guardstate

Led security reviews and protocol hardening for production DeFi systems, supporting deployments securing $100M+ TVL (est.). Built invariant-driven testing frameworks using Foundry, fuzzing, and exploit simulation that surfaced critical failure modes pre-deployment. Identified and mitigated critical vulnerabilities including reentrancy, oracle manipulation, accounting drift, signer validation flaws, and privilege escalation risks. Defined and enforced secure upgrade and migration strategies for live protocols, reducing risk of state corruption and fund loss. Refactored state transition logic and access controls to reduce attack surface and improve correctness guarantees. Contributed to protocol design and contract implementation discussions, balancing product requirements with security constraints. Supported mainnet releases with zero critical vulnerabilities post-deployment.

Designed and secured Solana programs supporting staking, reward distribution, liquidity routing, and delegated state transitions. Built and integrated programs with client-side applications using Web3.js, enabling staking and reward tracking workflows. Validated PDA-based account models, signer constraints, and CPI safety checks enforcing strict authorization boundaries. Identified and mitigated vulnerabilities across CPI interactions, signer validation, reward accounting, and liquidity flows. Modeled adversarial scenarios (MEV manipulation, reward exploitation, liquidity abuse) to stress-test protocol assumptions. Developed local validator simulations and exploit scenarios to validate real-world failure conditions.

Developed and secured smart contracts for tokenized index products managing multi-million-dollar assets. Built end-to-end DeFi features including issuance/redemption flows, portfolio rebalancing logic, and contract-driven workflows. Integrated smart contracts with React/Next.js frontends using Ethers.js, enabling real-time portfolio tracking and transaction flows. Designed contract APIs and event schemas consumed by frontend and backend systems. Introduced fuzzing and invariant testing, significantly improving protocol safety under adversarial conditions. Hardened contract logic against price manipulation, rounding loss, accounting inconsistencies, and privileged misuse. Reduced gas costs by ~20% through optimized storage and access patterns. Executed safe upgrade processes for live contracts, ensuring no disruption to users.

Built smart contracts supporting Bitcoin-backed asset flows (RBTC) across DeFi systems. Contributed to lending and staking primitives with a focus on correctness and reliability. Developed test suites covering edge-case validation, accounting consistency, and integration behavior. Strengthened asset movement reliability through validation of state assumptions and failure conditions. Supported integrations across custody systems, monitoring pipelines, and exchange infrastructure.

Developed vault controller contracts managing automated yield strategies across multiple liquidity sources. Built user-facing vault interaction flows including deposits, withdrawals, and yield harvesting. Integrated contracts with frontend dashboards and off-chain services for real-time position tracking. Designed contract interfaces enabling external integrations with aggregators and strategy systems. Improved vault accounting correctness through validation across deposits, withdrawals, and harvest cycles. Contributed to governance-controlled upgrades via timelocks and multisig. Identified edge cases in share pricing and liquidity flows, preventing inconsistencies.

Built backend services supporting high-volume blockchain deposit and withdrawal workflows. Developed APIs for wallet monitoring, transaction indexing, and confirmation tracking. Integrated blockchain assets via RPC layers, node infrastructure, and address systems. Improved transaction reconciliation pipelines, reducing inconsistencies during peak trading. Implemented monitoring and alerting systems for transaction and network health. Strengthened custody safeguards and withdrawal validation logic.

Built backend services for high-throughput financial systems with strong consistency guarantees. Designed APIs for payment processing workflows with focus on correctness and traceability. Implemented fraud detection and validation pipelines for near real-time processing. Improved system resilience via idempotency, retries, and fault-tolerant patterns. Deployed and operated containerized services on AWS.