Design, build, and ship a multi-tenant SaaS platform , including backend services, web applications, mobile apps, and third-party integrations. Work extensively with AI coding and development tools to accelerate delivery while reviewing, testing, debugging, and improving AI-generated code. Take ownership of code quality, architecture, testing, performance, and production readiness . Manage infrastructure, deployment, monitoring, and application operations on AWS . Implement and maintain strong application and data security , particularly for sensitive payroll and financial information. Integrate and maintain third-party APIs, including services related to payroll, banking, telephony, telematics, and other business systems . Work directly with the founder to translate product requirements into scalable technical solutions. Take ownership of both web and mobile development as required, including React Native applications.