kennieharold99

Delivered protocol platform features including gasless approvals, categorical markets, and USDT market integration to reduce approval friction and improve user flexibility. Developed and maintained APIs and indexing services; collaborated with cross-functional teams on integration, troubleshooting, architecture decisions, and production rollouts. Performed security reviews and audits to mitigate high-risk vulnerabilities (e.g., reentrancy and DoS); partnered with engineers to implement fixes and strengthen system integrity. Worked closely with the CTO on roadmap planning and scalable architecture design; supported code reviews to maintain engineering standards and consistency.

Built full-stack features for Pitaka App, a BSP-licensed e-wallet, delivering responsive UI components and backend services for cash in/out, KYC verification, and bills payment. Led implementation of core EVM features including custom gas fees, onboarding improvements, multi-wallet support, and custom EVM-compatible chain integrations. Led development of a Bitcoin wallet feature including wallet creation, balance calculation via the Mempool API, and cost-efficient BTC transfer execution. Designed and delivered Pitaka Pay (stablecoin to fiat and fiat to stablecoin conversion), covering architecture, frontend, backend, and API development.

Deployed a staking dApp with Uniswap integration on Polygon, optimizing resource usage and liquidity handling for a cost-effective user experience. Studied and reverse-engineered privacy-focused cryptography patterns by exploring the Tornado Cash repository to understand ZK-based mixer design principles.

Migrated smart contracts to the UUPS upgradeable pattern (OpenZeppelin) to improve maintainability and align with security best practices.

Delivered client web and mobile apps in Agile teams, contributing across design, development, testing, and maintenance while adapting to evolving requirements. Launched a coach-pairing mobile app with Google Maps, SMS notifications, and a referral system on Android and iOS, focusing on UX details and reliability. Managed a React Native mobile app project including merchant coupons and QR-based point redemption; integrated Twilio SMS, Google Maps, Firebase push notifications, and QR scanning. Maintained regular client communication, providing progress updates and translating feedback into actionable requirements.

Created manual test plans and executed QA testing; collaborated with developers to resolve issues and improve release quality. Documented test cases and evaluated feature performance to ensure alignment with requirements and user expectations.