- focused testing of financial and smart - contract workflows, and optimized automated suite execution time from 3 hours down to under 10 minutes covered dex, staking, vesting and treasury flows across several client products built and maintained automated test suites for smart - contract and api regression coverage mix of api, integration, backend and smart - contract testing validated data consistency across apis, backend services, databases and blockchain transactions chased several defects that only showed up when multiple services interacted, for example the issues often caused by timing or state mismatches code reviews and requirements analysis alongside testing tested payment processing, subscriptions and account/treasury flows (payment gateway and billing testing)

- tested complex defi systems consisting of 25+ interdependent smart contracts developed automated test suites for smart - contract regression and mainnet - fork testing performed mainnet - fork testing to catch scenarios that could result in significant financial loss and expose the client to regulatory/legal liability tested staking, yield farming, vesting, liquidity and token workflows traced smart - contract bugs back through the integration layer and confirmed fixes didn't break anything downstream contributed to security audit preparation and remediation of identified issues