Six years across engineering and product, mostly in payments — M-Pesa and telco-led mobile money in Kenya, and payment infrastructure for markets where the rails are still being decided.
Own payment products end to end — strategy, business requirements, payment flows, pricing and transaction limits, risk and compliance — for infrastructure serving high-risk payment use cases. Designed the wallet layer: Bitcoin/Lightning payments, stable-value balances, and automated liquidity and settlement flows.
Built digital HR and business platforms for SMEs and multinationals, and delivered the M-Pesa integrations that put mobile-money collections and disbursements inside those workflows. Cut frontend defects 30% through testing and review practice, and mentored the junior engineers.
Led design and development of the REST APIs behind business-critical products, turning customer and operational requirements into backend services. Reduced critical errors 30% through backend architecture and deployment automation.
Built transaction infrastructure for a digital-asset trading platform — blockchain transaction flows, APIs, and the analytics pipelines joining transaction and engagement data. Retention rose 25% as transaction reliability improved.
Built smart contracts and backend infrastructure for a platform aimed at low-cost, accessible payments — then spent as much time with the people using it, running developer and adoption programmes and folding what came back into the product.
Built digital insurance workflows in React, Node.js, SQL and MongoDB, focused on customer onboarding and service delivery. Improved platform efficiency by 35%.